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feat: ADR-0035 4b — foreign keys in CREATE TABLE

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Add foreign keys to advanced-mode SQL CREATE TABLE — the SQL spelling of
an ADR-0013 named relationship, created in the same transaction as the
table (one undo step).

- Grammar: inline `<col> … REFERENCES <parent>[(<col>)] [ON DELETE/UPDATE
  …]` (a new column constraint) and table-level `[CONSTRAINT <name>]
  FOREIGN KEY (<col>) REFERENCES …` (two new element branches — both
  start on a concrete keyword, never a leading Optional, which would
  abort the element Choice). Referential clauses reuse
  shared::REFERENTIAL_CLAUSES.
- Builder: greedy FK-clause consumption (parens consumed internally so
  they don't perturb the 4a.3 element-boundary depth tracker); inline FK
  auto-named, table FK takes an optional CONSTRAINT name.
- Worker: do_create_table resolves + validates each FK before building
  the DDL (self-ref validates against the in-statement columns/PK; bare
  REFERENCES resolves to the parent's single-column PK, composite ->
  error; PK-target + Type::fk_target_type compatibility), emits the
  FOREIGN KEY clause identically to schema_to_ddl, and writes the
  relationship metadata in the create transaction.
- Reuse: name/uniqueness/metadata-insert/type-compat factored into shared
  helpers; do_add_relationship refactored to use them.
- FKs round-trip via the existing relationship plumbing (no new
  persistence structures); describe surfaces the relationship.

Self-references and bare `REFERENCES <parent>` supported (user-confirmed).
Self-ref pre-submit indicator wrinkle deferred to 4i (tracked in ADR §13,
a code comment, and the plan).

DA/runda round added cross-cutting probes (FK survives the add-column
rebuild + a later rebuild_from_text; referential actions survive rebuild;
drop-child clears the relationship; drop-parent refused; bare self-ref
resolves to own PK) — all green, no fixes needed.

27 new tests (grammar/builder + Tier-3). Docs: ADR-0035 Status/§13,
README, requirements.md Q1.

Tests: 1795 passing, 0 failing, 1 ignored. Clippy clean.
This commit is contained in:
claude@clouddev1
2026-05-25 15:35:48 +00:00
parent 60111f69d5
commit 76d60591bf
11 changed files with 1588 additions and 81 deletions
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docs/adr/0035-advanced-mode-sql-ddl.md
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@@ -3,12 +3,13 @@
## Status
Accepted. Design agreed with the user (2026-05-24); the approach is
**validated end-to-end by sub-phases 4a / 4a.2 / 4a.3** (`CREATE TABLE`
with column- and table-level constraints, implemented 2026-05-25 —
plans `docs/plans/20260524-adr-0035-sql-ddl-4a.md`,
`…-4a2.md`, `…-4a3.md`), so the decision is accepted while the remaining
sub-phases (**4b–4i**, §13) continue. This is **Phase 4** of the
ADR-0030 roadmap (the
**validated end-to-end by sub-phases 4a / 4a.2 / 4a.3 / 4b**
(`CREATE TABLE` with column- and table-level constraints and foreign
keys, implemented 2026-05-25 — plans
`docs/plans/20260524-adr-0035-sql-ddl-4a.md`, `…-4a2.md`, `…-4a3.md`,
`docs/plans/20260525-adr-0035-sql-ddl-4b.md`), so the decision is
accepted while the remaining sub-phases (**4c–4i**, §13) continue. This
is **Phase 4** of the ADR-0030 roadmap (the
advanced-mode SQL surface), the peer of ADR-0031 (expression grammar),
ADR-0032 (`SELECT`), and ADR-0033 (DML). It **clarifies ADR-0030 §4**
on how DDL is represented and executed.
@@ -351,8 +352,21 @@ ADR-0033's structure:
introduces a structure simple mode could never produce, or an
expression the structural helper cannot consume — cf. the
`UNIQUE`-index flag in 4d and the rename op in 4h.)
- **4b — Foreign keys in `CREATE TABLE`.** Inline `REFERENCES` +
table-level `FOREIGN KEY` → relationship metadata, one undo step.
- **4b — Foreign keys in `CREATE TABLE`.** *(Implemented 2026-05-25 —
plan `docs/plans/20260525-adr-0035-sql-ddl-4b.md`.)* Inline
`REFERENCES <parent>[(<col>)] [ON DELETE/UPDATE …]` + table-level
`[CONSTRAINT <name>] FOREIGN KEY (<col>) REFERENCES …` → ADR-0013
relationship metadata, written in the create transaction (one undo
step). Reuses the relationship name/uniqueness/metadata helpers
shared with `add relationship`; `do_create_table` emits the
`FOREIGN KEY` clause identically to `schema_to_ddl`. **Self-references**
(parent = the table being created, validated against the in-statement
columns/PK) and the **bare `REFERENCES <parent>`** form (resolves to
the parent's single-column PK; composite → error) are both supported
(user-confirmed). Inline FKs are auto-named; only the table-level form
takes `CONSTRAINT <name>`. PK-target only (UNIQUE-target deferred with
`add relationship`); `Type::fk_target_type` (ADR-0011) governs type
compatibility.
- **4c — `DROP TABLE [IF EXISTS]`** → `SqlDropTable` (cascade parity;
`IF EXISTS` no-op-with-note, §4).
- **4d — `CREATE [UNIQUE] INDEX` / `DROP INDEX`** → `SqlCreateIndex`
@@ -370,7 +384,17 @@ ADR-0033's structure:
- **4h — `ALTER TABLE … RENAME TO`** (the §6 new low-level op).
- **4i — Verification sweep.** Typing-surface + matrix coverage,
engine-neutral error pass, undo-parity check (one step per
statement), `help`/usage for the new forms.
statement), `help`/usage for the new forms. **Carried in from earlier
slices:** (a) refresh the `CREATE TABLE` help/usage skeleton for the
4a.2 `DEFAULT`/`CHECK`/composite-`UNIQUE`, 4a.3 table-`CHECK`, and 4b
FK forms (deferred from each); (b) `describe` display of table-level
constraints (composite `UNIQUE` + table `CHECK`); (c) **4b self-ref
FK indicator** — a `CREATE TABLE` with a self-referencing FK
(`references <self>`) parses + executes correctly, but the pre-submit
schema-existence diagnostic falsely flags the not-yet-created self
table as unknown (the FK parent slot is `IdentSource::Tables`). Make
the diagnostic treat a FK parent equal to the `CREATE TABLE` target as
valid, so the indicator stops lying for self-references.
## Consequences
docs/adr/README.md
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docs/plans/20260525-adr-0035-sql-ddl-4b.md
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@@ -0,0 +1,266 @@
# Plan: ADR-0035 Phase 4, sub-phase 4b — foreign keys in `CREATE TABLE`
Add foreign keys to advanced-mode SQL `CREATE TABLE`: inline
`<col> <type> REFERENCES <parent>[(<pcol>)] [ON DELETE …] [ON UPDATE …]`
and table-level `[CONSTRAINT <name>] FOREIGN KEY (<ccol>) REFERENCES
<parent>[(<pcol>)] [ON DELETE …] [ON UPDATE …]`. Each FK is the SQL
spelling of an ADR-0013 **named relationship**: one `CREATE TABLE`
creates the table *and* its relationship metadata in one transaction =
**one undo step** (ADR-0035 §5). Builds on 4a/4a.2/4a.3.
## 1. Baseline
- Tests: **1769 passing, 0 failing, 1 ignored**; clippy clean. Branch
`main`, last commit `60111f6` (4a.3). 4b starts here.
## 2. Decisions locked with the user (do not re-litigate)
1. **Self-referencing FK supported** (2026-05-25): `CREATE TABLE emp
(id int primary key, mgr int REFERENCES emp(id))`. When the FK's
parent table equals the table being created, the referenced column is
validated against the columns/PK **being defined** (not `read_schema`,
which would fail — the table doesn't exist yet). Metadata row carries
`parent_table = child_table`.
2. **Bare `REFERENCES <parent>` supported** (2026-05-25, standard SQL +
the §7 "trust like SQL" posture): resolves to the parent's
**single-column PK**; a parent with a composite PK is a clear error
("name the referenced column"). The explicit `REFERENCES parent(col)`
form is the primary one (ADR §4).
3. **Inline `REFERENCES` is always auto-named; only the table-level
`FOREIGN KEY` form takes `CONSTRAINT <name>`** (ADR §4/§5). Auto-name:
`<Parent>_<pcol>_to_<Child>_<ccol>` (ADR-0013).
4. **PK-target only** (ADR-0013/0011): the referenced column must be a
primary key; UNIQUE-target FKs stay deferred (as for `add
relationship`). Type compatibility via `Type::fk_target_type`
(ADR-0011).
5. **One statement = one command = one transaction = one undo step**
(ADR-0035 §5/§10), including a multi-FK `CREATE TABLE`.
## 3. Phase 1 — Requirements checklist (4b)
### Functional
- [ ] Inline column FK `REFERENCES <parent>[(<pcol>)] [ON DELETE <a>]
[ON UPDATE <a>]` parses (advanced mode); child column = the column it
is attached to.
- [ ] Table-level `[CONSTRAINT <name>] FOREIGN KEY (<ccol>) REFERENCES
<parent>[(<pcol>)] [ON DELETE <a>] [ON UPDATE <a>]` parses; `<ccol>`
is the child column.
- [ ] `ON DELETE` / `ON UPDATE` each optional, either order, default
`no action`; actions `cascade` / `restrict` / `set null` / `no action`
(reuse `shared::REFERENTIAL_CLAUSES`).
- [ ] Multiple FKs in one statement → multiple relationships, all in one
transaction / one undo step.
- [ ] Self-referencing FK (parent = table being created) validated
against the columns/PK being defined.
- [ ] Bare `REFERENCES <parent>` resolves to the parent's single-column
PK; composite-PK parent → friendly "name the column" error.
- [ ] Validation (reused with `do_add_relationship`): parent column is a
PK; child column type == `parent_type.fk_target_type()`; relationship
name unique. Engine-neutral errors.
- [ ] Structural execution: `do_create_table` emits the `FOREIGN KEY`
clause(s) **identically to `schema_to_ddl`** (the §6.1 rule) and writes
`__rdbms_playground_relationships` rows in its transaction.
- [ ] FK still-rejected test from 4a.3 (`foreign_key_still_rejected`)
flipped to accepted.
### Cross-cutting / round-trip
- [ ] A table created with FK(s) round-trips: relationships appear in
`project.yaml`, survive `rebuild_from_text`, and the FK is enforced
(a violating insert fails) before and after rebuild.
- [ ] `describe` shows the relationship (outbound on the child, inbound
on the parent) — FKs are first-class (unlike table CHECK, FK metadata
*is* surfaced by `do_describe_table`).
- [ ] One undo step removes the table **and** its relationship rows;
redo recreates both.
- [ ] `history.log` / replay: the literal SQL line replays as a write.
### Testing (ADR-0008 four tiers)
- [ ] **Tier 1** (builder): inline + table-level FK captured (child/
parent/columns/actions); `CONSTRAINT <name>`; bare `REFERENCES`
(parent_column = None); multiple FKs; ON DELETE/UPDATE in both orders;
self-ref shape; FK alongside CHECK/PK/UNIQUE (depth/element coexistence).
- [ ] **Tier 3** (`tests/sql_create_table.rs`): FK enforced (violating
insert fails); cascade behaviour; auto-name + explicit name in
`REL_TABLE`; type-mismatch + non-PK-target + composite-bare-ref errors;
self-ref enforced; **survives rebuild**; `describe` shows the relation.
- [ ] **Undo** Tier-3: one step; undo drops table + relationship rows.
## 4. Architecture & design
### 4.1 Grammar (`src/dsl/grammar/sql_create_table.rs`)
- **Action clauses**: reuse `shared::REFERENTIAL_CLAUSES` (the
`on <delete|update> <action>` repeat, 0..2) — same keywords as SQL.
- **Inline FK** — new `COL_CONSTRAINT_CHOICES` branch
`REFERENCES <parent_ident> [ '(' <pcol_ident> ')' ] REFERENTIAL_CLAUSES`.
Idents: `fk_parent_table`, `fk_parent_column` roles
(`IdentSource::Schema` for the parent so it completes from the cache;
parent-column also schema-ish — confirm the right source; the table
being created is `NewName`).
- **Table-level FK** — new `ELEMENT_CHOICES` branch
`[CONSTRAINT <name_ident>] FOREIGN KEY '(' <ccol_ident> ')' REFERENCES
<parent_ident> [ '(' <pcol_ident> ')' ] REFERENTIAL_CLAUSES`. Idents:
`fk_name` (NewName), `fk_child_column`, `fk_parent_table`,
`fk_parent_column`.
- The bare `REFERENCES parent` form: make the `( pcol )` group
`Optional`.
### 4.2 Builder (`build_sql_create_table`, `ddl.rs`)
Greedy-consume each FK clause when its keyword is hit (parens consumed
**inside** the handler, so they don't perturb the §4a.3 `depth` tracker):
- On `Word("references")` (inline; `column_open == true`): child column
= `columns.last()`; read the following `fk_parent_table` ident,
optional `( fk_parent_column )`, then drain referential clauses
(`while peek == on { … }`, mapping `delete`/`update` → actions via the
existing `parse_action` logic). Push an `FkSpec { name: None, … }`.
- On `Word("constraint")`: stash `pending_fk_name = next fk_name ident`.
- On `Word("foreign")` (table-level; `column_open == false`): consume
`key ( fk_child_column ) references fk_parent_table [ ( fk_parent_column ) ]`
+ referential clauses; push `FkSpec { name: pending_fk_name.take(), … }`.
A small `FkSpec { name: Option<String>, child_column: String,
parent_table: String, parent_column: Option<String>, on_delete,
on_update }` accumulates into `Command::SqlCreateTable.foreign_keys`.
### 4.3 Command AST (`src/dsl/command.rs`)
`SqlCreateTable` gains `foreign_keys: Vec<SqlForeignKey>` where
`SqlForeignKey { name: Option<String>, child_column: String,
parent_table: String, parent_column: Option<String>, on_delete:
ReferentialAction, on_update: ReferentialAction }`. (`parent_column`
optional = the bare-ref form, resolved at execution.)
### 4.4 Worker — `do_create_table` (the only executor)
Threaded a `foreign_keys: &[SqlForeignKey]` param (and through
`Request`/method/dispatch). Inside, **before** building the DDL:
For each FK, resolve + validate (reusing helpers, §4.5):
1. **Resolve `parent_column`** (bare form): self-ref → the statement's
own single-column `primary_key` (composite → error); else →
`read_schema(parent).primary_key` single column (composite → error).
2. **Parent is a PK**: self-ref → `parent_column ∈ primary_key` being
defined; else → `read_schema(parent)` column with `primary_key`.
Obtain `parent_user_type`.
3. **Child type compat**: child column must be among the `columns` being
defined; its type must equal `parent_user_type.fk_target_type()`
(shared helper; friendly mismatch error).
4. **Name**: `resolve_relationship_name(name, parent, pcol, child, ccol)`
then uniqueness check (shared helpers).
Then emit `FOREIGN KEY (<ccol>) REFERENCES <parent>(<resolved_pcol>) ON
DELETE <od> ON UPDATE <ou>` **after the CHECK clauses**, exactly as
`schema_to_ddl` does (always explicit pcol + both actions, so create-DDL
== rebuild-DDL — no drift). Write each `REL_TABLE` row in the existing
transaction (before `finalize_persistence`, so the snapshot/yaml sees it).
`do_describe_table(name)` already surfaces the new relationships.
### 4.5 Shared helpers (refactor `do_add_relationship`, don't duplicate)
Factor out of `do_add_relationship`, used by both it and
`do_create_table`:
- `fk_type_mismatch_error(...)` / a `check_fk_type_compat(parent_type,
child_type, …) -> Result<()>`.
- `resolve_relationship_name(name, parent, pcol, child, ccol) -> String`.
- `ensure_relationship_name_unique(conn, name) -> Result<()>`.
- `insert_relationship_metadata(tx, name, parent, pcol, child, ccol,
on_delete, on_update) -> Result<()>`.
`do_add_relationship` keeps its `read_schema`-based validation + rebuild;
`do_create_table` validates against the in-statement specs. Only the
naming/uniqueness/metadata-write + type-compat message are shared.
### 4.6 No new persistence/round-trip structures
FKs already round-trip: `read_schema` reads them via
`pragma_foreign_key_list`; `RelationshipSchema` → `project.yaml`;
`build_read_schema` re-emits them inline on rebuild via `schema_to_ddl`.
4b adds **no** new `TableSchema`/YAML field — it reuses the existing
relationship plumbing entirely. (The litmus test: an FK is a structure
the model already persists.)
### 4.7 Friendly catalog / keys
New diagnostics may be needed (non-PK target, type mismatch,
composite-bare-ref, unknown parent table) — but most reuse
`do_add_relationship`'s existing engine-neutral errors. Any new
`help_id`/diagnostic key gets a `keys.rs` entry **and** an `en-US.yaml`
body (lockstep test) with engine-neutral wording. Help/usage skeleton
refresh stays batched into **4i** (consistent with 4a.2/4a.3).
## 5. Out of 4b scope
- `DROP TABLE` (4c), indexes (4d), `ALTER TABLE` (4e–4h).
- UNIQUE-target FKs (deferred with `add relationship`).
- `MATCH` / `DEFERRABLE` and other engine-specific FK extras (ADR §12 —
parse error).
## 6. Open items / implementer calls
1. **`IdentSource` for the parent table/column slots** — RESOLVED:
`IdentSource::Tables`/`Columns` (matching the `add relationship`
endpoints; completion + existence hint). **Known wrinkle deferred to
4i (user-confirmed 2026-05-25):** a self-referencing FK
(`references <self>`) parses + executes correctly, but the pre-submit
schema-existence indicator falsely flags the not-yet-created self
table as unknown. Tracked in **three places** so it is not lost:
ADR-0035 §13 4i bullet, a `NOTE (4i)` code comment at `FK_PARENT_TABLE`
(`src/dsl/grammar/sql_create_table.rs`), and here. The 4i fix teaches
the diagnostic about the `CREATE TABLE` target.
2. **Two-DDL-generators drift** — assert by a create→rebuild test that
the FK survives and is enforced after rebuild (the §6.1 net).
3. **Self-ref column-order / forward ref** — `REFERENCES emp(id)` where
`id` is defined in the same statement; SQLite accepts it. Confirm by
test, incl. the bare self-ref `REFERENCES emp`.
## 7. Devil's Advocate review of this plan
- **Reuse vs fork?** `do_create_table` stays the single create executor;
FK validation/naming/metadata-write are shared helpers with
`do_add_relationship` — no second relationship path. ✓
- **DDL drift?** `do_create_table` emits the FK clause byte-identical to
`schema_to_ddl` (explicit resolved pcol + both actions), guarded by a
survives-rebuild test — the 4a `serial` lesson applied. ✓
- **Bare-ref ambiguity?** Resolved to the single-column PK with an
explicit composite-PK error — not silently guessed. ✓
- **Self-ref soundness?** Validated against the in-statement specs;
SQLite accepts the self-FK DDL; proven by an enforced + rebuild test. ✓
- **One undo step?** All FK rows + the table land in the one
`snapshot_then`-wrapped create transaction. A dedicated undo test. ✓
- **Silent scope drop?** UNIQUE-target + FK extras explicitly out (parse
error / deferred), consistent with `add relationship`. ✓
## 8. Implementation sequence (test-first)
1. **Command + grammar (inline + table FK) + builder** — Tier-1 builder
tests (inline, table-level, CONSTRAINT name, bare ref, multi-FK,
action orders, self-ref shape, FK+CHECK coexistence) → red → add
`SqlForeignKey`, the grammar branches (reusing
`shared::REFERENTIAL_CLAUSES`), the builder handlers, thread the field
through `Request`/method/dispatch/runtime → green. Flip
`foreign_key_still_rejected` → accepted.
2. **Worker execution + shared helpers** — Tier-3 (FK enforced, cascade,
auto/explicit name in `REL_TABLE`, errors: non-PK, type mismatch,
composite-bare-ref; self-ref enforced) → red → factor the shared
helpers out of `do_add_relationship`, add FK resolve/validate + DDL
emission + metadata writes to `do_create_table` → green.
3. **Round-trip + describe + undo** — Tier-3 (survives rebuild + still
enforced; `describe` shows the relation; one undo step drops table +
rels) → green.
4. **Catalog/keys** — any new diagnostic keys in lockstep + vocab audit.
5. **Full sweep** — `cargo test` (no regression from 1769) + clippy.
6. **Docs** — ADR-0035 Status/§13 4b note; README; `requirements.md` Q1.
Propose commit; wait for approval.
## 9. Exit gate
- All §3 items satisfied; four tiers green, zero skips; no regression
from the 1769 baseline; written DA pass on the delivered slice; clippy
clean.
docs/requirements.md
+6 -3
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@@ -220,9 +220,12 @@ handoff-14 cleanup; 449 after B2/C2.)
then per-column `DEFAULT`/`CHECK` (raw `sql_expr` text) and composite
`UNIQUE(a,b)` (4a.2), then table-level/multi-column `CHECK` (4a.3 —
round-trips via the new `__rdbms_playground_table_checks` metadata
table, since the engine reports no CHECK constraints)). Remaining DDL
— FK (4b), `DROP TABLE` (4c), indexes (4d), `ALTER TABLE` (4e–4h) —
is phased per ADR-0035 §13.)*
table, since the engine reports no CHECK constraints), then foreign
keys (4b — inline `REFERENCES` + table-level `FOREIGN KEY` → ADR-0013
named relationships in the create transaction; self-references and
bare `REFERENCES <parent>` supported)). Remaining DDL — `DROP TABLE`
(4c), indexes (4d), `ALTER TABLE` (4e–4h) — is phased per
ADR-0035 §13.)*
- [ ] **Q2** Non-standard syntax rejected with a clear message
pointing at the supported subset.
*(Design done — ADR-0030 §8: out-of-subset statements are
src/db.rs
+283 -49
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@@ -33,7 +33,7 @@ use tracing::{debug, info, warn};
use crate::dsl::action::ReferentialAction;
use crate::dsl::command::{
ChangeColumnMode, Command, CompareOp, Constraint, ConstraintKind, Expr, IndexSelector,
Operand, Predicate, RelationshipSelector, RowFilter,
Operand, Predicate, RelationshipSelector, RowFilter, SqlForeignKey,
};
use crate::dsl::ColumnSpec;
use crate::dsl::shortid;
@@ -467,6 +467,7 @@ enum Request {
primary_key: Vec<String>,
unique_constraints: Vec<Vec<String>>,
check_constraints: Vec<String>,
foreign_keys: Vec<SqlForeignKey>,
if_not_exists: bool,
source: Option<String>,
reply: oneshot::Sender<Result<CreateOutcome, DbError>>,
@@ -838,6 +839,7 @@ impl Database {
primary_key: Vec<String>,
unique_constraints: Vec<Vec<String>>,
check_constraints: Vec<String>,
foreign_keys: Vec<SqlForeignKey>,
if_not_exists: bool,
source: Option<String>,
) -> Result<CreateOutcome, DbError> {
@@ -848,6 +850,7 @@ impl Database {
primary_key,
unique_constraints,
check_constraints,
foreign_keys,
if_not_exists,
source,
reply,
@@ -1708,6 +1711,7 @@ fn handle_request(
&primary_key,
&[],
&[],
&[],
));
}
Request::SqlCreateTable {
@@ -1716,6 +1720,7 @@ fn handle_request(
primary_key,
unique_constraints,
check_constraints,
foreign_keys,
if_not_exists,
source,
reply,
@@ -1745,6 +1750,7 @@ fn handle_request(
&primary_key,
&unique_constraints,
&check_constraints,
&foreign_keys,
)
.map(CreateOutcome::Created)
});
@@ -2637,6 +2643,7 @@ fn do_create_table(
primary_key: &[String],
unique_constraints: &[Vec<String>],
check_constraints: &[String],
foreign_keys: &[SqlForeignKey],
) -> Result<TableDescription, DbError> {
if columns.is_empty() {
// SQLite requires at least one column. The DSL grammar
@@ -2647,6 +2654,11 @@ fn do_create_table(
"tables need at least one column".to_string(),
));
}
// Resolve + validate any foreign keys before building the DDL, so
// an invalid reference aborts before the table is created (ADR-0035
// §5, sub-phase 4b). Self-references validate against the columns
// being defined; other parents must already exist.
let resolved_fks = resolve_create_table_fks(conn, name, columns, primary_key, foreign_keys)?;
// Inline `PRIMARY KEY` on the column when the table has a single
// primary-key column and it is the **first** column — the exact
@@ -2736,6 +2748,21 @@ fn do_create_table(
ddl.push(')');
}
// Foreign keys (ADR-0035 §5, sub-phase 4b) — emitted identically to
// `schema_to_ddl` (the §6.1 two-generators rule): always the
// explicit resolved parent column + both actions, so the create DDL
// and the rebuild DDL match byte-for-byte.
for fk in &resolved_fks {
ddl.push_str(&format!(
", FOREIGN KEY ({child}) REFERENCES {parent}({pcol}) ON DELETE {od} ON UPDATE {ou}",
child = quote_ident(&fk.child_column),
parent = quote_ident(&fk.parent_table),
pcol = quote_ident(&fk.parent_column),
od = fk.on_delete.sql_clause(),
ou = fk.on_update.sql_clause(),
));
}
ddl.push_str(") STRICT;");
debug!(ddl = %ddl, "create_table");
@@ -2761,6 +2788,21 @@ fn do_create_table(
)
.map_err(DbError::from_rusqlite)?;
}
// Foreign-key relationships (ADR-0035 §5): one metadata row per FK,
// in the same transaction as the table — so the whole statement is
// one undo step.
for fk in &resolved_fks {
insert_relationship_metadata(
&tx,
&fk.name,
&fk.parent_table,
&fk.parent_column,
name,
&fk.child_column,
fk.on_delete,
fk.on_update,
)?;
}
let description = do_describe_table(conn, name)?;
let changes = Changes {
schema_dirty: true,
@@ -5314,6 +5356,225 @@ where
)
}
/// Auto-name a relationship per ADR-0013
/// (`<Parent>_<pcol>_to_<Child>_<ccol>`, reading in the declared
/// direction) when `name` is `None`; otherwise use the supplied name.
/// Shared by the DSL `add relationship` path and advanced-mode SQL
/// `CREATE TABLE` foreign keys (ADR-0035 §5).
fn resolve_relationship_name(
name: Option<&str>,
parent_table: &str,
parent_column: &str,
child_table: &str,
child_column: &str,
) -> String {
name.map_or_else(
|| format!("{parent_table}_{parent_column}_to_{child_table}_{child_column}"),
ToString::to_string,
)
}
/// Reject a relationship name that collides with an existing one (the
/// `name` column is UNIQUE, ADR-0013). Engine-neutral message.
fn ensure_relationship_name_unique(conn: &Connection, name: &str) -> Result<(), DbError> {
let collision: i64 = conn
.query_row(
&format!("SELECT COUNT(*) FROM {REL_TABLE} WHERE name = ?1;"),
[name],
|row| row.get(0),
)
.map_err(DbError::from_rusqlite)?;
if collision > 0 {
return Err(DbError::Unsupported(format!(
"a relationship named `{name}` already exists. \
Pick a different name or drop the existing one first."
)));
}
Ok(())
}
/// Insert one relationship metadata row into `REL_TABLE` (ADR-0013).
/// Shared by `add relationship` (inside its rebuild transaction) and
/// SQL `CREATE TABLE` foreign keys (inside the create transaction);
/// `conn` may be a `&Transaction` (deref-coerces to `&Connection`).
#[allow(clippy::too_many_arguments)]
fn insert_relationship_metadata(
conn: &Connection,
name: &str,
parent_table: &str,
parent_column: &str,
child_table: &str,
child_column: &str,
on_delete: ReferentialAction,
on_update: ReferentialAction,
) -> Result<(), DbError> {
conn.execute(
&format!(
"INSERT INTO {REL_TABLE} \
(name, parent_table, parent_column, child_table, child_column, on_delete, on_update) \
VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7);"
),
[
name,
parent_table,
parent_column,
child_table,
child_column,
on_delete.keyword(),
on_update.keyword(),
],
)
.map_err(DbError::from_rusqlite)?;
Ok(())
}
/// Validate that an FK child column's type is compatible with the
/// referenced parent column's type — it must equal the parent type's
/// `fk_target_type()` (ADR-0011). Engine-neutral mismatch error.
fn check_fk_type_compat(
parent_table: &str,
parent_column: &str,
parent_type: Type,
child_table: &str,
child_column: &str,
child_type: Type,
) -> Result<(), DbError> {
let expected = parent_type.fk_target_type();
if child_type != expected {
return Err(DbError::Unsupported(format!(
"type mismatch: `{child_table}.{child_column}` is `{child_type}` but \
a foreign key referencing `{parent_table}.{parent_column}` \
(`{parent_type}`) requires `{expected}`. \
Either change the column type, or pick a different FK column."
)));
}
Ok(())
}
/// A `CREATE TABLE` foreign key after resolution + validation
/// (ADR-0035 §5, sub-phase 4b): the bare-`REFERENCES` parent column is
/// resolved, the relationship name is decided, and PK-target /
/// type-compat are checked.
struct ResolvedFk {
name: String,
child_column: String,
parent_table: String,
parent_column: String,
on_delete: ReferentialAction,
on_update: ReferentialAction,
}
/// Resolve + validate every foreign key declared in a `CREATE TABLE`
/// (ADR-0035 §5, sub-phase 4b) **before** the table is built, so an
/// invalid reference aborts cleanly. A self-referencing FK (parent is
/// the table being created) is validated against the columns/PK being
/// defined; any other parent must already exist. The bare
/// `REFERENCES <parent>` form resolves to the parent's single-column
/// PK (composite → error). Reuses the relationship validation/naming
/// helpers shared with `do_add_relationship`.
fn resolve_create_table_fks(
conn: &Connection,
table_name: &str,
columns: &[ColumnSpec],
primary_key: &[String],
foreign_keys: &[SqlForeignKey],
) -> Result<Vec<ResolvedFk>, DbError> {
let mut out = Vec::with_capacity(foreign_keys.len());
for fk in foreign_keys {
// The parent's PK column list + a (name -> user type) lookup.
// A self-reference reads the in-statement specs (the table does
// not exist yet); any other parent must already exist.
let (parent_pk, parent_cols): (Vec<String>, Vec<(String, Option<Type>)>) =
if fk.parent_table == table_name {
(
primary_key.to_vec(),
columns.iter().map(|c| (c.name.clone(), Some(c.ty))).collect(),
)
} else {
let ps = read_schema(conn, &fk.parent_table)?;
(
ps.primary_key.clone(),
ps.columns
.iter()
.map(|c| (c.name.clone(), c.user_type))
.collect(),
)
};
// Explicit referenced column, or the parent's single-column PK
// for the bare `REFERENCES <parent>` form.
let parent_column = match &fk.parent_column {
Some(c) => c.clone(),
None => {
if parent_pk.len() == 1 {
parent_pk[0].clone()
} else {
return Err(DbError::Unsupported(format!(
"`{parent}` has a composite primary key, so a bare \
reference is ambiguous — name the referenced column, \
e.g. `REFERENCES {parent}(<col>)`.",
parent = fk.parent_table,
)));
}
}
};
// The referenced column must be a primary key (ADR-0011/0013).
if !parent_pk.contains(&parent_column) {
return Err(DbError::Unsupported(format!(
"column `{}.{}` is not a primary key. Foreign keys must \
reference a primary key (UNIQUE-target FKs land in a later \
iteration).",
fk.parent_table, parent_column
)));
}
let parent_type = parent_cols
.iter()
.find(|(n, _)| n == &parent_column)
.and_then(|(_, t)| *t)
.ok_or_else(|| DbError::Sqlite {
message: format!("no such column: {}.{}", fk.parent_table, parent_column),
kind: SqliteErrorKind::NoSuchColumn,
})?;
// The child column must be one of the columns being defined.
let child = columns
.iter()
.find(|c| c.name == fk.child_column)
.ok_or_else(|| DbError::Sqlite {
message: format!("no such column: {}.{}", table_name, fk.child_column),
kind: SqliteErrorKind::NoSuchColumn,
})?;
check_fk_type_compat(
&fk.parent_table,
&parent_column,
parent_type,
table_name,
&fk.child_column,
child.ty,
)?;
let resolved_name = resolve_relationship_name(
fk.name.as_deref(),
&fk.parent_table,
&parent_column,
table_name,
&fk.child_column,
);
ensure_relationship_name_unique(conn, &resolved_name)?;
out.push(ResolvedFk {
name: resolved_name,
child_column: fk.child_column.clone(),
parent_table: fk.parent_table.clone(),
parent_column,
on_delete: fk.on_delete,
on_update: fk.on_update,
});
}
Ok(out)
}
#[allow(clippy::too_many_arguments)]
fn do_add_relationship(
conn: &Connection,
@@ -5388,38 +5649,21 @@ fn do_add_relationship(
let actual = child_col.user_type.ok_or_else(|| DbError::Unsupported(
"child column has no user type metadata".to_string(),
))?;
if actual != expected_child_type {
return Err(DbError::Unsupported(format!(
"type mismatch: `{child_table}.{child_column}` is `{actual}` but \
a foreign key referencing `{parent_table}.{parent_column}` \
(`{parent_user_type}`) requires `{expected_child_type}`. \
Either change the column type, or pick a different FK column."
)));
}
check_fk_type_compat(
parent_table,
parent_column,
parent_user_type,
child_table,
child_column,
actual,
)?;
}
// 4. Determine relationship name (auto-gen or supplied) and
// check uniqueness against the metadata table.
let resolved_name = name.map_or_else(
// Auto-name follows the user-typed `from <Parent>.<col>
// to <Child>.<col>` direction so the name reads as the
// grammar reads — see ADR-0013.
|| format!("{parent_table}_{parent_column}_to_{child_table}_{child_column}"),
ToString::to_string,
);
let collision: i64 = conn
.query_row(
&format!("SELECT COUNT(*) FROM {REL_TABLE} WHERE name = ?1;"),
[&resolved_name],
|row| row.get(0),
)
.map_err(DbError::from_rusqlite)?;
if collision > 0 {
return Err(DbError::Unsupported(format!(
"a relationship named `{resolved_name}` already exists. \
Pick a different name or drop the existing one first."
)));
}
let resolved_name =
resolve_relationship_name(name, parent_table, parent_column, child_table, child_column);
ensure_relationship_name_unique(conn, &resolved_name)?;
// 5. Build the new schema with the FK appended.
let mut new_schema = child_schema.clone();
@@ -5432,10 +5676,7 @@ fn do_add_relationship(
});
// 6. Rebuild, with metadata updates inside the transaction.
let on_delete_kw = on_delete.keyword();
let on_update_kw = on_update.keyword();
let column_user_type_kw = expected_child_type.keyword();
let resolved_name_for_meta = resolved_name.as_str();
rebuild_table(conn, child_table, &child_schema, &new_schema, |tx| {
if needs_create_column {
tx.execute(
@@ -5447,23 +5688,16 @@ fn do_add_relationship(
)
.map_err(DbError::from_rusqlite)?;
}
tx.execute(
&format!(
"INSERT INTO {REL_TABLE} \
(name, parent_table, parent_column, child_table, child_column, on_delete, on_update) \
VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7);"
),
[
resolved_name_for_meta,
parent_table,
parent_column,
child_table,
child_column,
on_delete_kw,
on_update_kw,
],
)
.map_err(DbError::from_rusqlite)?;
insert_relationship_metadata(
tx,
&resolved_name,
parent_table,
parent_column,
child_table,
child_column,
on_delete,
on_update,
)?;
// Persistence runs inside the same tx so a write
// failure rolls back both the schema and the metadata
// (commit-db-last per ADR-0015 §6).
src/dsl/command.rs
+32
View File
@@ -15,6 +15,33 @@ use crate::dsl::action::ReferentialAction;
use crate::dsl::types::Type;
use crate::dsl::value::Value;
/// A foreign key declared in an advanced-mode SQL `CREATE TABLE`.
///
/// The SQL spelling of an ADR-0013 named relationship (ADR-0035 §5,
/// sub-phase 4b). Produced by both the inline
/// `<col> … REFERENCES <parent>[(<pcol>)] …` form (always auto-named)
/// and the table-level `[CONSTRAINT <name>] FOREIGN KEY (<ccol>)
/// REFERENCES <parent>[(<pcol>)] …` form. The relationship is created
/// together with the table, in one transaction = one undo step.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct SqlForeignKey {
/// `CONSTRAINT <name>` on a table-level FK; `None` for an inline
/// FK or an unnamed table FK (auto-named at execution per
/// ADR-0013).
pub name: Option<String>,
/// The column in the table being created that holds the FK.
pub child_column: String,
/// The referenced (parent) table — may be the table being created
/// (a self-referencing FK).
pub parent_table: String,
/// The referenced parent column. `None` for the bare
/// `REFERENCES <parent>` form, resolved at execution to the
/// parent's single-column primary key (ADR-0035 §4b, user-confirmed).
pub parent_column: Option<String>,
pub on_delete: ReferentialAction,
pub on_update: ReferentialAction,
}
/// A column at table-creation time: a name, a user-facing
/// type, and its column-level constraints (ADR-0029).
///
@@ -153,6 +180,11 @@ pub enum Command {
/// CHECK has no column to hang on and the engine reports no
/// CHECKs, so it round-trips via a dedicated metadata table.
check_constraints: Vec<String>,
/// Foreign keys (ADR-0035 §5, sub-phase 4b) — inline
/// `REFERENCES` and table-level `FOREIGN KEY`, each created as
/// an ADR-0013 named relationship in the same transaction as
/// the table (one undo step).
foreign_keys: Vec<SqlForeignKey>,
if_not_exists: bool,
},
/// Add a column to an existing table. The column carries
src/dsl/grammar/ddl.rs
+123 -4
View File
@@ -14,7 +14,7 @@
use crate::dsl::action::ReferentialAction;
use crate::dsl::command::{
ChangeColumnMode, ColumnSpec, Command, Constraint, ConstraintKind, Expr, IndexSelector,
RelationshipSelector,
RelationshipSelector, SqlForeignKey,
};
use crate::dsl::value::Value;
use crate::dsl::grammar::{
@@ -1321,6 +1321,7 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
let mut primary_key: Vec<String> = Vec::new();
let mut unique_constraints: Vec<Vec<String>> = Vec::new();
let mut check_constraints: Vec<String> = Vec::new();
let mut foreign_keys: Vec<SqlForeignKey> = Vec::new();
let mut pending_name: Option<String> = None;
// Distinguish a table-level `CHECK (…)` from a column-level one
// (ADR-0035 §4a.3): both are spelled `check (`, and `Word` matches
@@ -1334,6 +1335,9 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
// comma at the column-list interior, `depth == 1`.
let mut column_open = false;
let mut depth = 0usize;
// A `CONSTRAINT <name>` prefix stashes the name until the following
// table-level `FOREIGN KEY` consumes it (ADR-0035 §5, 4b).
let mut pending_fk_name: Option<String> = None;
let mut items = path.items.iter().peekable();
while let Some(item) = items.next() {
match &item.kind {
@@ -1463,10 +1467,48 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
}
}
}
// `constraint <name>` — stash the name for the table-level
// `foreign key` that follows (ADR-0035 §5, 4b).
MatchedKind::Word("constraint") => {
if let Some(it) = items.next() {
pending_fk_name = Some(it.text.clone());
}
}
// Inline `references <parent> [(<col>)] [on …]` — a
// column-level FK on the current column (ADR-0035 §5, 4b).
// Auto-named at execution; the FK clause's own parens are
// consumed in `consume_fk_reference`, so they don't perturb
// the element-boundary `depth` tracker.
MatchedKind::Word("references") => {
let child_column = columns.last().map_or_else(String::new, |c| c.name.clone());
foreign_keys.push(consume_fk_reference(&mut items, None, child_column));
}
// Table-level `[constraint <name>] foreign key (<col>)
// references <parent> [(<col>)] [on …]` (ADR-0035 §5, 4b).
MatchedKind::Word("foreign") => {
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("key"))) {
items.next(); // `key`
}
// `( <child column> )`
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Punct('('))) {
items.next();
}
let child_column = items.next().map_or_else(String::new, |it| it.text.clone());
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Punct(')'))) {
items.next();
}
// `references <parent> …`
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("references"))) {
items.next();
}
let fk = consume_fk_reference(&mut items, pending_fk_name.take(), child_column);
foreign_keys.push(fk);
}
// Track paren depth for element-boundary detection. The
// column/`check`/`default`/table-`unique` arms consume their
// own parens, so the only parens reaching here are the outer
// column list, type length-args, and table-`PRIMARY KEY (…)`.
// column/`check`/`default`/table-`unique`/FK arms consume
// their own parens, so the only parens reaching here are the
// outer column list, type length-args, and
// table-`PRIMARY KEY (…)`.
MatchedKind::Punct('(') => depth += 1,
MatchedKind::Punct(')') => depth = depth.saturating_sub(1),
// A comma at the column-list interior ends the current
@@ -1494,6 +1536,7 @@ fn build_sql_create_table(path: &MatchedPath, source: &str) -> Result<Command, V
primary_key,
unique_constraints,
check_constraints,
foreign_keys,
if_not_exists,
})
}
@@ -1564,6 +1607,82 @@ where
Some((inner_start, inner_end))
}
/// Consume the tail of a foreign-key reference from the matched-item
/// stream (ADR-0035 §5, sub-phase 4b): the parent table ident, an
/// optional `( <parent col> )`, and any `on <delete|update> <action>`
/// clauses. The next item must be the parent-table ident (the
/// `references` keyword was already consumed by the caller). The
/// reference's own parens are consumed here, so they never reach the
/// builder's element-boundary `depth` tracker.
fn consume_fk_reference<'a, I>(
items: &mut std::iter::Peekable<I>,
name: Option<String>,
child_column: String,
) -> SqlForeignKey
where
I: Iterator<Item = &'a crate::dsl::walker::outcome::MatchedItem>,
{
let parent_table = items.next().map_or_else(String::new, |it| it.text.clone());
// Optional `( <parent column> )`.
let mut parent_column = None;
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Punct('('))) {
items.next(); // `(`
if let Some(it) = items.next() {
parent_column = Some(it.text.clone());
}
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Punct(')'))) {
items.next(); // `)`
}
}
// `on <delete|update> <action>` clauses, in either order, 0..2.
let mut on_delete = ReferentialAction::default_action();
let mut on_update = ReferentialAction::default_action();
while matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("on"))) {
items.next(); // `on`
let target = items.next().map(|it| it.kind.clone());
let action = consume_referential_action(items);
match target {
Some(MatchedKind::Word("delete")) => on_delete = action,
Some(MatchedKind::Word("update")) => on_update = action,
_ => {}
}
}
SqlForeignKey {
name,
child_column,
parent_table,
parent_column,
on_delete,
on_update,
}
}
/// Read a single referential action (`cascade` / `restrict` /
/// `set null` / `no action`) from the matched-item stream — the
/// two-word forms (`set null`, `no action`) consume their second word.
fn consume_referential_action<'a, I>(items: &mut std::iter::Peekable<I>) -> ReferentialAction
where
I: Iterator<Item = &'a crate::dsl::walker::outcome::MatchedItem>,
{
match items.next().map(|it| it.kind.clone()) {
Some(MatchedKind::Word("cascade")) => ReferentialAction::Cascade,
Some(MatchedKind::Word("restrict")) => ReferentialAction::Restrict,
Some(MatchedKind::Word("set")) => {
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("null"))) {
items.next();
}
ReferentialAction::SetNull
}
Some(MatchedKind::Word("no")) => {
if matches!(items.peek().map(|i| &i.kind), Some(MatchedKind::Word("action"))) {
items.next();
}
ReferentialAction::NoAction
}
_ => ReferentialAction::default_action(),
}
}
pub static SQL_CREATE_TABLE: CommandNode = CommandNode {
entry: Word::keyword("create"),
shape: Node::Subgrammar(&super::sql_create_table::SQL_CREATE_TABLE_SHAPE),
src/dsl/grammar/sql_create_table.rs
+276 -13
View File
@@ -24,7 +24,7 @@
//! `sql_insert::SQL_INSERT_SHAPE`, which starts at `INTO`).
use crate::dsl::grammar::sql_select::reject_internal_table;
use crate::dsl::grammar::{IdentSource, Node, ValidationError, Word, sql_expr};
use crate::dsl::grammar::{IdentSource, Node, ValidationError, Word, shared, sql_expr};
use crate::dsl::types::Type;
static COMMA: Node = Node::Punct(',');
@@ -139,6 +139,63 @@ static CHECK_NODES: &[Node] = &[
Node::Subgrammar(&sql_expr::SQL_OR_EXPR),
Node::Punct(')'),
];
// --- Foreign keys (ADR-0035 §5, sub-phase 4b) ---------------------
//
// Inline `REFERENCES <parent>[(<col>)] [ON DELETE/UPDATE …]` and
// table-level `[CONSTRAINT <name>] FOREIGN KEY (<col>) REFERENCES …`.
// Each is the SQL spelling of an ADR-0013 named relationship. The
// referenced parent table/column use the `Tables`/`Columns` sources
// (completion + existence hints), matching the `add relationship`
// endpoints; the `( <col> )` is optional (the bare `REFERENCES
// <parent>` form resolves to the parent's PK at execution).
// NOTE (4i): `IdentSource::Tables` existence-checks the parent — good
// for the common case (a typo'd parent shows a pre-submit hint), but a
// self-referencing FK (`references <self>` while creating `<self>`)
// false-flags the not-yet-created table as unknown. Parse + execution
// are correct (the self-ref is validated against the in-statement
// columns); only the live typing indicator is briefly wrong. ADR-0035
// §13 4i: teach the schema-existence diagnostic about the CREATE TABLE
// target so the self-ref indicator stops lying.
const FK_PARENT_TABLE: Node = Node::Ident {
source: IdentSource::Tables,
role: "fk_parent_table",
validator: None,
highlight_override: None,
writes_table: false,
writes_column: false,
writes_user_listed_column: false,
writes_table_alias: false,
writes_cte_name: false,
writes_projection_alias: false,
};
const FK_PARENT_COLUMN: Node = Node::Ident {
source: IdentSource::Columns,
role: "fk_parent_column",
validator: None,
highlight_override: None,
writes_table: false,
writes_column: false,
writes_user_listed_column: false,
writes_table_alias: false,
writes_cte_name: false,
writes_projection_alias: false,
};
static FK_PARENT_COL_NODES: &[Node] = &[Node::Punct('('), FK_PARENT_COLUMN, Node::Punct(')')];
const FK_PARENT_COL_OPT: Node = Node::Optional(&Node::Seq(FK_PARENT_COL_NODES));
// `REFERENCES <parent> [ ( <col> ) ] [on delete/update …]` — the inline
// column-FK constraint. The referential clauses reuse the shared
// `on <delete|update> <action>` grammar (the DSL `add relationship`
// keywords are the SQL keywords).
static REFERENCES_NODES: &[Node] = &[
Node::Word(Word::keyword("references")),
FK_PARENT_TABLE,
FK_PARENT_COL_OPT,
shared::REFERENTIAL_CLAUSES,
];
const REFERENCES_CLAUSE: Node = Node::Seq(REFERENCES_NODES);
// `NOT NULL` | `UNIQUE` | `PRIMARY KEY` | `DEFAULT <expr>` |
// `CHECK (<expr>)`. Each branch starts on a distinct keyword, so the
// `Choice` never ambiguously commits.
@@ -148,6 +205,7 @@ static COL_CONSTRAINT_CHOICES: &[Node] = &[
Node::Seq(PRIMARY_KEY_NODES),
Node::Seq(DEFAULT_NODES),
Node::Seq(CHECK_NODES),
REFERENCES_CLAUSE,
];
const COL_CONSTRAINT: Node = Node::Choice(COL_CONSTRAINT_CHOICES);
/// Zero-or-more column constraints after the type (`min: 0`).
@@ -250,13 +308,80 @@ static TABLE_CHECK_NODES: &[Node] = &[
];
const TABLE_CHECK: Node = Node::Seq(TABLE_CHECK_NODES);
// Table-level foreign key (ADR-0035 §5, sub-phase 4b):
// `[CONSTRAINT <name>] FOREIGN KEY ( <child col> ) REFERENCES
// <parent> [ ( <col> ) ] [on delete/update …]`. The child column is
// being defined in this statement (`NewName`); the optional
// `CONSTRAINT <name>` names the relationship (an inline `REFERENCES`
// is always auto-named instead).
const FK_CHILD_COLUMN: Node = Node::Ident {
source: IdentSource::NewName,
role: "fk_child_column",
validator: None,
highlight_override: None,
writes_table: false,
writes_column: false,
writes_user_listed_column: false,
writes_table_alias: false,
writes_cte_name: false,
writes_projection_alias: false,
};
const FK_NAME: Node = Node::Ident {
source: IdentSource::NewName,
role: "fk_name",
validator: None,
highlight_override: None,
writes_table: false,
writes_column: false,
writes_user_listed_column: false,
writes_table_alias: false,
writes_cte_name: false,
writes_projection_alias: false,
};
// The `FOREIGN KEY (col) REFERENCES …` body, shared by the named and
// unnamed table-FK element branches. Each branch starts with a concrete
// keyword (`foreign` / `constraint`) — never a leading `Optional`,
// which would advance the Seq index and turn a later mismatch into a
// hard failure that aborts the enclosing element `Choice`.
static FOREIGN_KEY_BODY_NODES: &[Node] = &[
Node::Word(Word::keyword("foreign")),
Node::Word(Word::keyword("key")),
Node::Punct('('),
FK_CHILD_COLUMN,
Node::Punct(')'),
Node::Word(Word::keyword("references")),
FK_PARENT_TABLE,
FK_PARENT_COL_OPT,
shared::REFERENTIAL_CLAUSES,
];
const FOREIGN_KEY_BODY: Node = Node::Seq(FOREIGN_KEY_BODY_NODES);
// `FOREIGN KEY (…) …` — the unnamed table-level FK (auto-named).
const TABLE_FK: Node = FOREIGN_KEY_BODY;
// `CONSTRAINT <name> FOREIGN KEY (…) …` — the named table-level FK.
static TABLE_FK_NAMED_NODES: &[Node] = &[
Node::Word(Word::keyword("constraint")),
FK_NAME,
Node::Word(Word::keyword("foreign")),
Node::Word(Word::keyword("key")),
Node::Punct('('),
FK_CHILD_COLUMN,
Node::Punct(')'),
Node::Word(Word::keyword("references")),
FK_PARENT_TABLE,
FK_PARENT_COL_OPT,
shared::REFERENTIAL_CLAUSES,
];
const TABLE_FK_NAMED: Node = Node::Seq(TABLE_FK_NAMED_NODES);
// One element of the column list: a table-level `PRIMARY KEY (…)` /
// `UNIQUE (…)` / `CHECK (…)`, or a column definition. The table-level
// forms are tried first — each starts with a keyword (`primary` /
// `unique` / `check`) that disambiguates it from a column name. (A
// column literally named `primary`/`unique`/`check` is therefore
// unavailable, the same trade real SQL makes with its reserved words.)
static ELEMENT_CHOICES: &[Node] = &[TABLE_PK, TABLE_UNIQUE, TABLE_CHECK, COLUMN_DEF];
// `UNIQUE (…)` / `CHECK (…)` / `[CONSTRAINT <name>] FOREIGN KEY (…)`,
// or a column definition. The table-level forms are tried first — each
// starts with a keyword (`primary` / `unique` / `check` / `constraint`
// / `foreign`) that disambiguates it from a column name. (A column
// literally named with one of those keywords is therefore unavailable,
// the same trade real SQL makes with its reserved words.)
static ELEMENT_CHOICES: &[Node] =
&[TABLE_PK, TABLE_UNIQUE, TABLE_CHECK, TABLE_FK_NAMED, TABLE_FK, COLUMN_DEF];
const ELEMENT: Node = Node::Choice(ELEMENT_CHOICES);
static COLUMN_LIST_NODES: &[Node] = &[
@@ -471,11 +596,23 @@ mod tests {
}
#[test]
fn foreign_key_still_rejected() {
// FK in CREATE TABLE is 4b — neither inline `REFERENCES` nor a
// table-level `FOREIGN KEY` shape exists in the grammar yet.
bad("table t (id int, ref int references other(id))");
bad("table t (id int, foreign key (id) references other(id))");
fn foreign_keys_accepted() {
// 4b: inline `REFERENCES` and table-level `FOREIGN KEY`, with
// optional `(col)`, `ON DELETE`/`ON UPDATE`, and `CONSTRAINT`.
good("table t (id int, ref int references other(id))");
good("table t (id int, ref int references other)"); // bare ref
good("table t (id int, ref int references other(id) on delete cascade)");
good("table t (id int, ref int references other(id) on update set null on delete restrict)");
good("table t (id int, ref int, foreign key (ref) references other(id))");
good("table t (id int, ref int, constraint fk_x foreign key (ref) references other(id))");
good(
"table t (id int, a int, b int, foreign key (a) references p(id), \
foreign key (b) references q(id))",
);
// FK alongside the other table elements (coexistence).
good("table t (id int primary key, ref int references other(id), check (id > 0))");
// self-reference (parent is the table being created).
good("table emp (id int primary key, mgr int references emp(id))");
}
}
@@ -487,7 +624,8 @@ mod tests {
#[cfg(test)]
mod builder_tests {
use crate::dsl::command::{ColumnSpec, Command};
use crate::dsl::action::ReferentialAction;
use crate::dsl::command::{ColumnSpec, Command, SqlForeignKey};
use crate::dsl::parser::{parse_command, parse_command_in_mode};
use crate::dsl::types::Type;
use crate::mode::Mode;
@@ -808,4 +946,129 @@ mod builder_tests {
assert_eq!(checks, vec!["a > 0".to_string()]);
assert!(col(&cols, "a").check_sql.is_none() && col(&cols, "b").check_sql.is_none());
}
// --- 4b: foreign keys (inline + table-level) ---
/// Parse and return the foreign keys.
fn parse_sct_fks(input: &str) -> Vec<SqlForeignKey> {
match parse_command(input).expect("should parse") {
Command::SqlCreateTable { foreign_keys, .. } => foreign_keys,
other => panic!("expected SqlCreateTable, got {other:?}"),
}
}
#[test]
fn inline_reference_captured() {
let fks = parse_sct_fks("create table t (id int, pid int references parent(id))");
assert_eq!(fks.len(), 1);
let fk = &fks[0];
assert_eq!(fk.name, None, "inline FK is auto-named at execution");
assert_eq!(fk.child_column, "pid");
assert_eq!(fk.parent_table, "parent");
assert_eq!(fk.parent_column.as_deref(), Some("id"));
assert_eq!(fk.on_delete, ReferentialAction::NoAction);
assert_eq!(fk.on_update, ReferentialAction::NoAction);
}
#[test]
fn bare_inline_reference_has_no_parent_column() {
let fks = parse_sct_fks("create table t (id int, pid int references parent)");
assert_eq!(fks[0].parent_column, None, "bare REFERENCES — resolved at execution");
assert_eq!(fks[0].parent_table, "parent");
assert_eq!(fks[0].child_column, "pid");
}
#[test]
fn inline_reference_with_referential_actions() {
let fks = parse_sct_fks(
"create table t (id int, pid int references parent(id) \
on delete cascade on update set null)",
);
assert_eq!(fks[0].on_delete, ReferentialAction::Cascade);
assert_eq!(fks[0].on_update, ReferentialAction::SetNull);
}
#[test]
fn referential_action_order_is_flexible() {
// `on update` before `on delete` — either order is accepted.
let fks = parse_sct_fks(
"create table t (id int, pid int references parent(id) \
on update restrict on delete no action)",
);
assert_eq!(fks[0].on_update, ReferentialAction::Restrict);
assert_eq!(fks[0].on_delete, ReferentialAction::NoAction);
}
#[test]
fn table_level_foreign_key_captured() {
let fks =
parse_sct_fks("create table t (id int, pid int, foreign key (pid) references parent(id))");
assert_eq!(fks.len(), 1);
assert_eq!(fks[0].name, None);
assert_eq!(fks[0].child_column, "pid");
assert_eq!(fks[0].parent_table, "parent");
assert_eq!(fks[0].parent_column.as_deref(), Some("id"));
}
#[test]
fn table_level_foreign_key_with_constraint_name() {
let fks = parse_sct_fks(
"create table t (id int, pid int, \
constraint fk_parent foreign key (pid) references parent(id))",
);
assert_eq!(fks[0].name.as_deref(), Some("fk_parent"));
assert_eq!(fks[0].child_column, "pid");
}
#[test]
fn multiple_foreign_keys_collected_in_order() {
let fks = parse_sct_fks(
"create table t (id int, a int, b int, \
foreign key (a) references p(id), foreign key (b) references q(id))",
);
assert_eq!(fks.len(), 2);
assert_eq!((fks[0].child_column.as_str(), fks[0].parent_table.as_str()), ("a", "p"));
assert_eq!((fks[1].child_column.as_str(), fks[1].parent_table.as_str()), ("b", "q"));
}
#[test]
fn self_referencing_foreign_key_captured() {
let fks =
parse_sct_fks("create table emp (id int primary key, mgr int references emp(id))");
assert_eq!(fks[0].parent_table, "emp", "self-reference");
assert_eq!(fks[0].child_column, "mgr");
assert_eq!(fks[0].parent_column.as_deref(), Some("id"));
}
#[test]
fn inline_fk_coexists_with_check_and_pk() {
// FK clause must not be confused with the column CHECK that
// follows, nor disturb the table-level PK / CHECK detection.
match parse_command(
"create table t (id int primary key, pid int references parent(id) check (pid > 0), \
check (id <> pid))",
)
.expect("parses")
{
Command::SqlCreateTable {
primary_key,
foreign_keys,
check_constraints,
columns,
..
} => {
assert_eq!(primary_key, vec!["id".to_string()]);
assert_eq!(foreign_keys.len(), 1);
assert_eq!(foreign_keys[0].child_column, "pid");
// the column-level CHECK still attaches to `pid`
assert_eq!(
columns.iter().find(|c| c.name == "pid").unwrap().check_sql.as_deref(),
Some("pid > 0")
);
// the table-level CHECK is captured separately
assert_eq!(check_constraints, vec!["id <> pid".to_string()]);
}
other => panic!("expected SqlCreateTable, got {other:?}"),
}
}
}
src/dsl/mod.rs
+1 -1
View File
@@ -21,7 +21,7 @@ pub mod walker;
pub use action::ReferentialAction;
pub use command::{
AppCommand, ChangeColumnMode, ColumnSpec, Command, CompareOp, Expr, IndexSelector,
MessagesValue, ModeValue, Operand, Predicate, RelationshipSelector, RowFilter,
MessagesValue, ModeValue, Operand, Predicate, RelationshipSelector, RowFilter, SqlForeignKey,
};
pub use parser::{ParseError, parse_command};
pub use types::Type;
src/runtime.rs
+2
View File
@@ -1926,6 +1926,7 @@ async fn execute_command_typed(
primary_key,
unique_constraints,
check_constraints,
foreign_keys,
if_not_exists,
} => database
.sql_create_table(
@@ -1934,6 +1935,7 @@ async fn execute_command_typed(
primary_key,
unique_constraints,
check_constraints,
foreign_keys,
if_not_exists,
src,
)
tests/sql_create_table.rs
+565 -1
View File
@@ -18,7 +18,7 @@
//! tests drive the worker directly, mirroring `tests/sql_insert.rs`.
use rdbms_playground::db::{CreateOutcome, Database};
use rdbms_playground::dsl::{ColumnSpec, Type, Value};
use rdbms_playground::dsl::{ColumnSpec, ReferentialAction, RowFilter, SqlForeignKey, Type, Value};
use rdbms_playground::persistence::Persistence;
use rdbms_playground::project;
@@ -53,6 +53,7 @@ fn created_table_appears_with_playground_types() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table Widget (id int primary key, name text)".to_string()),
))
@@ -91,6 +92,7 @@ fn integer_primary_key_is_plain_int() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id integer primary key)".to_string()),
))
@@ -117,6 +119,7 @@ fn serial_pk_autoincrements_in_multi_column_table() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id serial primary key, name text)".to_string()),
))
@@ -161,6 +164,7 @@ fn if_not_exists_is_a_noop_when_table_exists() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id int)".to_string()),
))
@@ -173,6 +177,7 @@ fn if_not_exists_is_a_noop_when_table_exists() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
true, // IF NOT EXISTS
Some("create table if not exists T (id int)".to_string()),
))
@@ -200,6 +205,7 @@ fn table_without_primary_key_is_allowed() {
vec![], // no primary key
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table Notes (body text)".to_string()),
))
@@ -243,6 +249,7 @@ fn check_constraint_is_enforced() {
vec!["id".to_string()],
vec![],
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id serial primary key, price real check (price >= 0))".to_string()),
))
@@ -278,6 +285,7 @@ fn default_is_applied_when_column_omitted() {
vec!["id".to_string()],
vec![],
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id serial primary key, label text, n int default 7)".to_string()),
))
@@ -307,6 +315,7 @@ fn composite_unique_is_enforced() {
vec![],
vec![vec!["a".to_string(), "b".to_string()]],
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (a int, b int, unique (a, b))".to_string()),
))
@@ -342,6 +351,7 @@ fn check_default_and_composite_unique_survive_rebuild() {
vec![],
vec![vec!["a".to_string(), "b".to_string()]],
vec![], // no table CHECK
vec![], // no FK
false,
Some(
"create table T (a int, b int, price real check (price >= 0), \
@@ -392,6 +402,7 @@ fn table_level_check_is_enforced() {
vec![],
vec![], // no composite UNIQUE
vec!["a < b".to_string()], // table-level CHECK
vec![], // no FK
false,
Some("create table T (a int, b int, check (a < b))".to_string()),
))
@@ -423,6 +434,7 @@ fn multiple_table_level_checks_all_enforced() {
vec![],
vec![], // no composite UNIQUE
vec!["a < b".to_string(), "b < c".to_string()],
vec![], // no FK
false,
Some("create table T (a int, b int, c int, check (a < b), check (b < c))".to_string()),
))
@@ -459,6 +471,7 @@ fn dropping_a_table_clears_its_table_check_metadata() {
vec![],
vec![], // no composite UNIQUE
vec!["a < b".to_string()],
vec![], // no FK
false,
Some("create table T (a int, b int, check (a < b))".to_string()),
)
@@ -496,6 +509,7 @@ fn table_level_check_survives_a_rebuild_triggering_column_add() {
vec![],
vec![], // no composite UNIQUE
vec!["a < b".to_string()],
vec![], // no FK
false,
Some("create table T (a int, b int, check (a < b))".to_string()),
))
@@ -547,6 +561,7 @@ fn table_level_check_survives_rebuild() {
vec![],
vec![], // no composite UNIQUE
vec!["a < b".to_string()],
vec![], // no FK
false,
Some("create table T (a int, b int, check (a < b))".to_string()),
))
@@ -583,6 +598,7 @@ fn if_not_exists_noop_is_journalled() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id int)".to_string()),
))
@@ -595,6 +611,7 @@ fn if_not_exists_noop_is_journalled() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
true,
Some(noop.to_string()),
))
@@ -615,6 +632,7 @@ fn plain_create_errors_when_table_exists() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id int)".to_string()),
))
@@ -626,6 +644,7 @@ fn plain_create_errors_when_table_exists() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false, // no IF NOT EXISTS
Some("create table T (id int)".to_string()),
));
@@ -642,6 +661,7 @@ fn sql_create_table_is_one_undo_step() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id int)".to_string()),
))
@@ -694,6 +714,7 @@ fn serial_pk_first_column_autoincrements_after_rebuild() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (id serial primary key, name text)".to_string()),
))
@@ -727,6 +748,7 @@ fn serial_pk_non_first_column_autoincrements_after_rebuild() {
vec!["id".to_string()],
vec![], // no composite UNIQUE
vec![], // no table CHECK
vec![], // no FK
false,
Some("create table T (name text, id serial primary key)".to_string()),
))
@@ -763,6 +785,7 @@ fn dropping_a_column_a_table_check_references_fails_cleanly() {
vec![],
vec![], // no composite UNIQUE
vec!["a < b".to_string()],
vec![], // no FK
false,
Some("create table T (a int, b int, check (a < b))".to_string()),
))
@@ -797,3 +820,544 @@ fn dropping_a_column_a_table_check_references_fails_cleanly() {
r.block_on(ins("1", "2")).expect("(1,2) valid — table survived intact");
assert!(r.block_on(ins("2", "1")).is_err(), "CHECK still enforced after the failed drop");
}
// =================================================================
// Sub-phase 4b — foreign keys in CREATE TABLE (ADR-0035 §5).
//
// These drive the worker directly with `SqlForeignKey` specs; the
// grammar (text -> Command) is covered by `builder_tests`. An FK is
// the SQL spelling of an ADR-0013 named relationship, created in the
// same transaction as the table (one undo step).
// =================================================================
/// A simple FK spec with default (no action) referential actions.
fn fk(child_column: &str, parent_table: &str, parent_column: Option<&str>) -> SqlForeignKey {
SqlForeignKey {
name: None,
child_column: child_column.to_string(),
parent_table: parent_table.to_string(),
parent_column: parent_column.map(str::to_string),
on_delete: ReferentialAction::NoAction,
on_update: ReferentialAction::NoAction,
}
}
/// Create `parent (id serial primary key, label text)` — the extra
/// column lets a row be inserted (a sole auto-fill serial has nothing
/// to bind). `id` auto-fills 1, 2, … on each label insert.
fn make_parent(db: &Database, r: &tokio::runtime::Runtime) {
r.block_on(db.sql_create_table(
"parent".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("label", Type::Text)],
vec!["id".to_string()],
vec![],
vec![],
vec![], // no FK
false,
Some("create table parent (id serial primary key, label text)".to_string()),
))
.expect("create parent");
}
/// Insert a parent row (label only); its serial `id` auto-fills.
fn insert_parent_row(db: &Database, r: &tokio::runtime::Runtime) {
r.block_on(db.insert(
"parent".to_string(),
Some(vec!["label".to_string()]),
vec![Value::Text("x".to_string())],
Some("insert".to_string()),
))
.expect("parent row");
}
#[test]
fn foreign_key_is_enforced() {
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid int references parent(id))".to_string()),
))
.expect("create child with FK");
// A parent row, then a valid child referencing it.
insert_parent_row(&db, &r); // id=1
r.block_on(db.insert(
"child".to_string(),
Some(vec!["pid".to_string()]),
vec![Value::Number("1".to_string())],
Some("insert".to_string()),
))
.expect("child pid=1 references an existing parent");
// A child referencing a non-existent parent is rejected.
let bad = r.block_on(db.insert(
"child".to_string(),
Some(vec!["pid".to_string()]),
vec![Value::Number("999".to_string())],
Some("insert".to_string()),
));
assert!(bad.is_err(), "FK rejects pid=999 (no such parent)");
}
#[test]
fn foreign_key_creates_named_relationship_visible_in_describe() {
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid int references parent(id))".to_string()),
))
.expect("create child with FK");
// The child has an outbound relationship; the parent an inbound one.
let child = r.block_on(db.describe_table("child".to_string(), None)).expect("describe child");
assert_eq!(child.outbound_relationships.len(), 1, "child references parent");
let rel = &child.outbound_relationships[0];
assert_eq!(rel.name, "parent_id_to_child_pid", "auto-named per ADR-0013");
assert_eq!(rel.other_table, "parent");
assert_eq!(rel.local_column, "pid");
let parent = r.block_on(db.describe_table("parent".to_string(), None)).expect("describe parent");
assert_eq!(parent.inbound_relationships.len(), 1, "parent is referenced by child");
}
#[test]
fn explicit_constraint_name_is_used() {
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
let mut spec = fk("pid", "parent", Some("id"));
spec.name = Some("child_to_parent".to_string());
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![spec],
false,
Some("create table child (id serial primary key, pid int, constraint child_to_parent foreign key (pid) references parent(id))".to_string()),
))
.expect("create child with named FK");
let child = r.block_on(db.describe_table("child".to_string(), None)).expect("describe");
assert_eq!(child.outbound_relationships[0].name, "child_to_parent");
}
#[test]
fn bare_references_resolves_to_parent_single_column_pk() {
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", None)], // bare REFERENCES parent
false,
Some("create table child (id serial primary key, pid int references parent)".to_string()),
))
.expect("create child with bare REFERENCES");
let child = r.block_on(db.describe_table("child".to_string(), None)).expect("describe");
assert_eq!(child.outbound_relationships[0].other_column, "id", "resolved to parent PK");
}
#[test]
fn self_referencing_foreign_key_is_enforced() {
let (_p, db, _d) = open(false);
let r = rt();
r.block_on(db.sql_create_table(
"emp".to_string(),
vec![ColumnSpec::new("id", Type::Int), ColumnSpec::new("mgr", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("mgr", "emp", Some("id"))], // self-reference
false,
Some("create table emp (id int primary key, mgr int references emp(id))".to_string()),
))
.expect("create self-referencing emp");
let ins = |id: &str, mgr: Option<&str>| {
let (cols, vals) = mgr.map_or_else(
|| (vec!["id".to_string()], vec![Value::Number(id.to_string())]),
|m| {
(
vec!["id".to_string(), "mgr".to_string()],
vec![Value::Number(id.to_string()), Value::Number(m.to_string())],
)
},
);
db.insert("emp".to_string(), Some(cols), vals, Some("insert".to_string()))
};
r.block_on(ins("1", None)).expect("root (mgr NULL)");
r.block_on(ins("2", Some("1"))).expect("emp 2 reports to 1");
assert!(r.block_on(ins("3", Some("99"))).is_err(), "self-FK rejects mgr=99");
}
#[test]
fn foreign_key_type_mismatch_is_rejected() {
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r); // parent.id is serial -> fk_target_type int
// child.pid declared text -> incompatible with int.
let res = r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Text)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid text references parent(id))".to_string()),
));
assert!(res.is_err(), "FK column type must match the parent's fk_target_type");
}
#[test]
fn foreign_key_to_non_pk_column_is_rejected() {
let (_p, db, _d) = open(false);
let r = rt();
r.block_on(db.sql_create_table(
"parent".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("label", Type::Text)],
vec!["id".to_string()],
vec![],
vec![],
vec![],
false,
Some("create table parent (id serial primary key, label text)".to_string()),
))
.expect("create parent");
let res = r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("plabel", Type::Text)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("plabel", "parent", Some("label"))], // label is not a PK
false,
Some("create table child (id serial primary key, plabel text references parent(label))".to_string()),
));
assert!(res.is_err(), "FK must target a primary key");
}
#[test]
fn foreign_key_survives_rebuild() {
let (p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid int references parent(id))".to_string()),
))
.expect("create child with FK");
r.block_on(db.rebuild_from_text(p.path().to_path_buf(), None)).expect("rebuild");
insert_parent_row(&db, &r);
assert!(
r.block_on(db.insert(
"child".to_string(),
Some(vec!["pid".to_string()]),
vec![Value::Number("999".to_string())],
Some("insert".to_string()),
))
.is_err(),
"FK still enforced after rebuild"
);
}
#[test]
fn create_table_with_fk_is_one_undo_step() {
let (_p, db, _d) = open(true); // undo enabled
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid int references parent(id))".to_string()),
))
.expect("create child with FK");
// One undo removes the child table AND its relationship row, so the
// parent (now un-referenced) can be described without a dangling rel.
r.block_on(db.undo()).expect("undo").expect("a step was undone");
assert!(!r.block_on(db.list_tables()).unwrap().contains(&"child".to_string()));
let parent = r.block_on(db.describe_table("parent".to_string(), None)).expect("describe parent");
assert!(parent.inbound_relationships.is_empty(), "the relationship was undone with the table");
}
#[test]
fn foreign_key_on_delete_cascade_takes_effect() {
// Proves the referential action reaches the engine DDL (not just
// the metadata): deleting a parent row cascades to the children.
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
let mut spec = fk("pid", "parent", Some("id"));
spec.on_delete = ReferentialAction::Cascade;
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![spec],
false,
Some(
"create table child (id serial primary key, pid int references parent(id) \
on delete cascade)"
.to_string(),
),
))
.expect("create child with ON DELETE CASCADE");
insert_parent_row(&db, &r); // id=1
r.block_on(db.insert(
"child".to_string(),
Some(vec!["pid".to_string()]),
vec![Value::Number("1".to_string())],
Some("insert".to_string()),
))
.expect("child referencing parent 1");
// Delete the parent row; the child should cascade away.
r.block_on(db.delete(
"parent".to_string(),
RowFilter::eq("id", Value::Number("1".to_string())),
Some("delete".to_string()),
))
.expect("delete parent");
let child_rows = r
.block_on(db.query_data("child".to_string(), None, None, None))
.expect("query child");
assert!(child_rows.rows.is_empty(), "ON DELETE CASCADE removed the child row");
}
#[test]
fn foreign_key_to_unknown_parent_is_rejected() {
let (_p, db, _d) = open(false);
let r = rt();
let res = r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "ghost", Some("id"))], // no such table
false,
Some("create table child (id serial primary key, pid int references ghost(id))".to_string()),
));
assert!(res.is_err(), "a FK to a non-existent parent table is rejected");
// And the failed create left nothing behind.
assert!(!r.block_on(db.list_tables()).unwrap().contains(&"child".to_string()));
}
#[test]
fn composite_pk_bare_reference_is_rejected() {
let (_p, db, _d) = open(false);
let r = rt();
r.block_on(db.sql_create_table(
"cp".to_string(),
vec![ColumnSpec::new("a", Type::Int), ColumnSpec::new("b", Type::Int)],
vec!["a".to_string(), "b".to_string()], // composite PK
vec![],
vec![],
vec![],
false,
Some("create table cp (a int, b int, primary key (a, b))".to_string()),
))
.expect("create composite-PK parent");
// A bare `REFERENCES cp` cannot disambiguate which PK column.
let res = r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("ref", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("ref", "cp", None)], // bare reference to a composite-PK parent
false,
Some("create table child (id serial primary key, ref int references cp)".to_string()),
));
assert!(res.is_err(), "bare REFERENCES to a composite-PK parent must be rejected");
}
#[test]
fn fk_survives_a_rebuild_triggering_column_add() {
// Cross-cutting (ADR-0013 rebuild primitive × 4b): adding a
// constrained column to a child that has an FK rebuilds the table
// via schema_to_ddl. The FK must survive in the engine AND the
// relationship metadata (so a later rebuild_from_text re-emits it).
let (p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid int references parent(id))".to_string()),
))
.expect("create child with FK");
// A UNIQUE column forces the rebuild path.
let mut c = ColumnSpec::new("code", Type::Int);
c.unique = true;
r.block_on(db.add_column("child".to_string(), c, Some("add column child: code(int) unique".to_string())))
.expect("add column via rebuild");
// The relationship still exists after the rebuild.
let child = r.block_on(db.describe_table("child".to_string(), None)).expect("describe");
assert_eq!(child.outbound_relationships.len(), 1, "FK survived the column-add rebuild");
// And the engine still enforces it (now and after a fresh rebuild).
insert_parent_row(&db, &r);
r.block_on(db.rebuild_from_text(p.path().to_path_buf(), None)).expect("rebuild");
assert!(
r.block_on(db.insert(
"child".to_string(),
Some(vec!["pid".to_string()]),
vec![Value::Number("999".to_string())],
Some("insert".to_string()),
))
.is_err(),
"FK still enforced after the column-add rebuild and a later rebuild_from_text"
);
}
#[test]
fn fk_referential_actions_survive_rebuild() {
// The actions (not just the FK's existence) must round-trip through
// pragma -> REL_TABLE -> project.yaml -> rebuild.
let (p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
let mut spec = fk("pid", "parent", Some("id"));
spec.on_delete = ReferentialAction::Cascade;
spec.on_update = ReferentialAction::SetNull;
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![spec],
false,
Some(
"create table child (id serial primary key, pid int references parent(id) \
on delete cascade on update set null)"
.to_string(),
),
))
.expect("create");
r.block_on(db.rebuild_from_text(p.path().to_path_buf(), None)).expect("rebuild");
let child = r.block_on(db.describe_table("child".to_string(), None)).expect("describe");
let rel = &child.outbound_relationships[0];
assert_eq!(rel.on_delete, ReferentialAction::Cascade, "ON DELETE survived rebuild");
assert_eq!(rel.on_update, ReferentialAction::SetNull, "ON UPDATE survived rebuild");
}
#[test]
fn dropping_the_child_clears_the_fk_relationship() {
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid int references parent(id))".to_string()),
))
.expect("create");
r.block_on(db.drop_table("child".to_string(), Some("drop table child".to_string())))
.expect("drop child");
let parent = r.block_on(db.describe_table("parent".to_string(), None)).expect("describe parent");
assert!(parent.inbound_relationships.is_empty(), "dropping the child cleared the relationship");
}
#[test]
fn dropping_a_referenced_parent_is_refused() {
// ADR-0013: a parent with inbound relationships can't be dropped.
let (_p, db, _d) = open(false);
let r = rt();
make_parent(&db, &r);
r.block_on(db.sql_create_table(
"child".to_string(),
vec![ColumnSpec::new("id", Type::Serial), ColumnSpec::new("pid", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("pid", "parent", Some("id"))],
false,
Some("create table child (id serial primary key, pid int references parent(id))".to_string()),
))
.expect("create");
assert!(
r.block_on(db.drop_table("parent".to_string(), Some("drop table parent".to_string()))).is_err(),
"a referenced parent can't be dropped while the child's FK exists"
);
}
#[test]
fn bare_self_reference_resolves_to_own_pk() {
let (_p, db, _d) = open(false);
let r = rt();
r.block_on(db.sql_create_table(
"emp".to_string(),
vec![ColumnSpec::new("id", Type::Int), ColumnSpec::new("mgr", Type::Int)],
vec!["id".to_string()],
vec![],
vec![],
vec![fk("mgr", "emp", None)], // bare AND self-referential
false,
Some("create table emp (id int primary key, mgr int references emp)".to_string()),
))
.expect("create self-referential emp with a bare reference");
let emp = r.block_on(db.describe_table("emp".to_string(), None)).expect("describe");
assert_eq!(emp.outbound_relationships[0].other_column, "id", "bare self-ref resolved to own PK");
// Enforced: a non-existent manager is rejected.
r.block_on(db.insert(
"emp".to_string(),
Some(vec!["id".to_string()]),
vec![Value::Number("1".to_string())],
Some("insert".to_string()),
))
.expect("root row");
assert!(
r.block_on(db.insert(
"emp".to_string(),
Some(vec!["id".to_string(), "mgr".to_string()]),
vec![Value::Number("2".to_string()), Value::Number("99".to_string())],
Some("insert".to_string()),
))
.is_err(),
"bare self-ref FK is enforced"
);
}