TML-2786: M:N slice 2 — relation filters (some/every/none) through the junction

[tensordreams]

Slice 2 of the SQL ORM: Many-to-Many End to End project (Linear project). Filters an M:N relation through its junction.

Stacked PR. Base is tml-2785 (#679, slice 1) → tml-2784 (#678) → tml-2597 (#673) → tml-2729 (#667) → main. Review/merge bottom-up.

Overview

db.orm.User.filter((u) => u.tags.some/every/none((t) => …)) now emits an EXISTS / NOT EXISTS subquery that walks the UserTag junction. Previously buildJoinWhere read only relation.on.localFields/targetFields, so an M:N filter produced a wrong-shape EXISTS that skipped the junction.

Changes (2 commits)

• f9226ccb9 — model-accessor.ts: buildManyToManyExistsExpr builds the two-sided junction correlation — junction→target (through.childColumns = target.targetColumns) and junction→parent (through.parentColumns = parent.{on.localFields resolved}, mirroring slice 1s read correlation), composite-key AND-ed. Shapes: some=EXISTS, none=NOT EXISTS, every=NOT EXISTS(… AND NOT(pred)), vacuous every({})=AndExpr.true() (consistent with the FK every path). Dispatch via a hasThrough type predicate (no bare cast). 6 AST unit tests.
• e65a9db43 — 9 integration tests (PGlite).

Integration tests (per the project standard)

Whole-row toEqual on the filtered user set; 8/9 use explicit .select; test 6 uses implicit/default selection. Covers some, none, every (incl. the vacuous tag-less-user-qualifies case, tested in isolation and alongside partial-match exclusion), and empty-match edges for all three operators.

Why

Second of the three relation-shaped M:N consumers over slice 0s shared through primitive. The filter correlation mirrors slice 1s read correlation for consistency.

Scope / notes

Filter only — write (TML-2787) is the last slice. No fixture change (reuses slice 1s User ↔ Tag + its seed helpers). No production change in the test dispatch. Broad integration runs show pre-existing PGlite/WASM JIT flakiness (logged); the M:N filter tests pass on targeted runs.

Refs: TML-2786.

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size-limit report 📦

Path	Size
postgres / no-emit	136.31 KB (+0.18% 🔺)
postgres / emit	125.97 KB (+0.19% 🔺)
mongo / no-emit	75.69 KB (0%)
mongo / emit	70.68 KB (0%)

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commit: 92d1741