fix(solid-db): preserve live result identity during reconciliation - #1825
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe Solid live-query hook now preserves row stores by result identity during collection synchronization. It handles custom-key reordering, duplicate public keys, and collection replacement. Tests verify row identity behavior, and a patch changeset documents the fix. ChangesSolid live-query reconciliation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The reviewed Solid live-query reconciliation change has no identified merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@packages/solid-db/src/useLiveQuery.ts`:
- Around line 335-337: Reset rowsByKey and rowsCollection whenever createEffect
detects a Collection identity change, before syncing the new collection’s
entries, so rows with reused keys receive fresh stores and Solid For remounts
their state; also clear rowsCollection in the disabled branch.
In `@packages/solid-db/tests/useLiveQuery.test.tsx`:
- Around line 2341-2344: Update the baseline writes in the mapper and ref
callback around initialTokens and initialNodes so each key is recorded only once
and replacement item references cannot overwrite the original identity baseline.
Apply the same write-once behavior to the labelAtCreation maps in the union
test.
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.changeset/fix-solid-custom-key-reconciliation.mdpackages/solid-db/src/useLiveQuery.tspackages/solid-db/tests/useLiveQuery.test.tsx
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tannerlinsley
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Reviewed the current head. Private result-key identity, reorders, union key collisions, and collection switching look good. All 73 Solid tests and the standalone type check passed locally. CI is green. Approved.
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useLiveQuerynow keeps one stable Solid row store per live Collection result key. This fixes custom-key rows corrupting one another when an update reorders them, while also keeping distinct union results separate when they expose the same public$key.Root cause
Solid's
reconciledefaults to matching rows byid, which does not work for collections keyed by another field such as_id. Matching by the row's public$keyfixes that reproduction but is not a complete identity rule: live-query results can preserve an upstream$keywhile the Collection assigns a different result key, and multipleunionAllbranches can therefore publish distinct results with the same$key.The adapter was asking a public row field to carry an identity that belongs to the live Collection. Under a collision, Solid could retain or mutate the wrong mapper and DOM node even after the core Collection contained the correct survivor.
Approach
unionAlloracle where two distinct result keys deliberately share the same upstream$key.Key invariants
$keyvalues are neither overwritten nor required to be unique in a derived result.Non-goals
Trade-offs
This keeps a small adapter-private map and one Solid store per live row. That adds linear bookkeeping, but avoids leaking internal result keys into public values and keeps updates fine-grained. Using public
$keydirectly is simpler, but is invalid for derived results where public and result identity differ.Verification
Commands below were run from
packages/solid-dbunless noted otherwise.RED on the pre-fix implementation
../../node_modules/.bin/vitest run tests/useLiveQuery.test.tsx --config vite.config.ts --configLoader runner --maxWorkers=2 --coverage.enabled=false --typecheck.enabled=false --reporter=verbose -t 'keeps union rows with colliding public keys tied to their live result identities'Result:
1 failed | 41 skipped. Setup proved two distinct live result keys with the same public$key, and the core Collection plus hook both reached one surviving Right row. The final identity checkpoint retained the deleted Left row's mapper/node:mapper-1andretainedOwnNode: false, instead ofmapper-2andtrue.Targeted hostile mutant
Temporarily restored the stale implementation's choice:
Running the same command produced the same identity failure:
1 failed | 41 skipped, withmapper-1/falseinstead ofmapper-2/true. The mutant was then removed.GREEN
../../node_modules/.bin/vitest run tests/useLiveQuery.test.tsx --config vite.config.ts --configLoader runner --maxWorkers=2 --coverage.enabled=false --typecheck.enabled=false --reporter=dot -t 'keeps (custom-key rows distinct|union rows with colliding public keys)'Result:
2 passed | 40 skipped.Result:
72 passedacross 2 files.Result:
30 passed.From the repository root:
Result: all commands exited 0. TypeScript produced no diagnostics; the Solid package built with declarations; ESLint and Prettier passed; both diff checks were clean.
Harness limitations
packages/solid-db/coverage/index.html; the complete runtime suite was rerun with coverage output disabled, so this PR makes no coverage-percentage claim.rootDirerrors. The repository-rooted standalone TypeScript command above passed cleanly.Files changed
.changeset/fix-solid-custom-key-reconciliation.md— records the Solid adapter patch.packages/solid-db/src/useLiveQuery.ts— keys stable private row stores by live Collection result identity.packages/solid-db/tests/useLiveQuery.test.tsx— covers custom-key reorder identity and colliding public keys across union results.Reported by @fehmer in #1524. This supersedes #1598 from @Leonabcd123, whose earlier
$key-based fix and regression established the initial direction; this replacement is implemented against currentmainand covers the additional public-key collision case.Fixes #1524
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