feat(nextly): a many-to-many field's junction table follows the field through its life - #1796
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📝 WalkthroughWalkthroughMany-to-many migrations now rename junction tables while preserving links, create and remove junction tables during field changes, drop them during collection deletion, and reject ambiguous or shared-table configurations. Tests and documentation cover these behaviors. ChangesMany-to-many junction lifecycle
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant CollectionMetadataService
participant DynamicCollectionService
participant DynamicCollectionSchemaService
participant Database
CollectionMetadataService->>DynamicCollectionService: generate collection migration
DynamicCollectionService->>DynamicCollectionSchemaService: generateAlterTableMigration with junction fields
DynamicCollectionSchemaService->>Database: rename, create, or drop junction tables
CollectionMetadataService->>DynamicCollectionService: generate collection drop migration
DynamicCollectionService->>DynamicCollectionSchemaService: generateDropTableMigration with fields
DynamicCollectionSchemaService->>Database: drop junction, companion, and main tables
Merge Risk: 🟡 Moderate · up to A migration can retain a junction table with columns for the previous relationship target, breaking subsequent relationship reads or writes. This should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description gives a detailed summary, scope, implementation outline, and verification results. However, it does not follow the required template and omits explicit type-of-change, changeset and semver confirmation, checklist status, and target-branch information.
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In
`@packages/nextly/src/domains/dynamic-collections/services/dynamic-collection-schema-service.ts`:
- Around line 957-973: Update the rename handling around junctionRename and
associationRename so simultaneous many-to-many and field-group renames generate
both independent migrations instead of the else-if path dropping
associationRename. Track junction and association rename sources and targets
independently, ensuring existing field-group rows migrate their _parent_field
values to the new name; alternatively reject mixed rename saves before metadata
is updated.
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docs/dynamic-collections/index.mdxpackages/nextly/src/domains/collections/services/collection-metadata-service.tspackages/nextly/src/domains/dynamic-collections/__tests__/dynamic-collection-schema-service.test.tspackages/nextly/src/domains/dynamic-collections/__tests__/junction-table-lifecycle.integration.test.tspackages/nextly/src/domains/dynamic-collections/__tests__/junction-table-lifecycle.test.tspackages/nextly/src/domains/dynamic-collections/services/dynamic-collection-schema-service.tspackages/nextly/src/domains/dynamic-collections/services/dynamic-collection-service.ts
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…achments, and pairs by target
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…ts fixture is production ddl PostgreSQL could rename a junction's foreign keys in place, which kept the referential actions the constraints were created with while the registry recorded the ones the same save edited; a foreign key whose actions changed is now dropped and declared again under its new name, in one statement, as MySQL already did. SQLite cannot alter a constraint; the gap is stated where the statements are written, and the wider gap (an actions-only edit emits nothing on any dialect, for every relationship kind) is filed as finding:referential-action-edits-emit-no-ddl. The SQLite integration fixture is built from generateMigrationSQL — the columns, keys and foreign keys a deployment has, with foreign keys enforced as the adapter enforces them — instead of two hand-written CREATE TABLEs.
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…o drop takes a shared junction Two more corners of the rename, both found by review on 4b301b6. An author-named junction keeps its table and constraint names across the field rename, so the round-2 rule — rename in place when the name is unchanged — let edited onDelete/onUpdate stay behind. A foreign key is now rebuilt whenever its name OR its actions changed; with one name in and out, as two statements on both dialects (one ALTER dropping and adding one name is MySQL bug #68286, error 1826, and on PostgreSQL would rest on subcommand ordering nothing here can test). MySQL takes two statements for two names as well: one is documented as supported only under ALGORITHM=INPLACE, which adding a foreign key cannot use with foreign_key_checks on. Two many-to-many fields naming one junction table is refused on save (validateJunctionOwnership, naming both fields): a link row does not say which field made it. A definition saved before that rule still reaches the diff, so a removal never drops a table a surviving field still resolves to.
…o-many-takes-its-junction-with-it
… not a bare throw The bare-Error allowlist pins dynamic-collection-validation-service.ts at 14 throws; a 15th is refused, and rightly: the refusal reaches the Builder through errorToMetadataResult, where a NextlyError keeps its code and its errors array (JUNCTION_TABLE_SHARED, naming both fields and the table) and a bare Error is flattened to its message. Same shape as MANY_TO_MANY_RENAME_AMBIGUOUS.
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…on push but not with main The first commit said pull_request.base.sha is fixed when the pull request is opened and never moves. Measured since: GitHub sets it at opening (the base tip, #1804: 0121364) and again on each push (the merge-base then: #1796 ebf8f78, #1803 da323d5 after a merge of main). What it never does is follow the base branch, and the merge ref the audit reads is rebuilt against the live base — so the drift is everything main gained since the last push, which a long queue makes likely. The fix is unchanged; the comment now says that. The first commit's body also cited #1794 as passing and then failing with nothing pushed between; a push landed at 14:24Z and the failing run is on it, so that example is withdrawn.
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Inline comments:
In
`@packages/nextly/src/domains/dynamic-collections/services/dynamic-collection-schema-service.ts`:
- Around line 2086-2099: Update the junction-table retention logic around
detectJunctionRename and junctionDrops to compare each table’s full junction
shape, including its target field, rather than only its name. Ensure a reused
table with a different target is not considered owned by the new field and is
dropped so its schema can be recreated correctly; keep matching-shape tables
retained.
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… as it was at the last push (#1804) * fix(ci): the hygiene gate diffs against the base branch's tip, not the sha the pr was opened on The fallow action scopes its audit to files changed since github.event.pull_request.base.sha unless told otherwise. GitHub records that sha when the pull request is opened and never moves it, while the merge ref the job checks out is rebuilt against the live base branch — so every file main gained while a pull request was open read as changed by it, and functions its author never touched (listEntries, generateCollectionUpdate, invalidatePermissionCache on #1787, which touches none of those files) failed the gate as introduced. The same pull request passed at 13:46Z and failed at 14:29Z with nothing pushed in between. The step now names origin/<base_ref>, as the envelope step in the same job already did; on the merge ref the three-dot diff has the live tip as its merge-base, so the scope is exactly the pull request. Ledger: task:ci-hygiene-gate-diffs-against-current-main, implementing finding:fallow-ci-blames-a-pr-for-main-moving. * fix(ci): say when github sets a pull request's base sha, which moves on push but not with main The first commit said pull_request.base.sha is fixed when the pull request is opened and never moves. Measured since: GitHub sets it at opening (the base tip, #1804: 0121364) and again on each push (the merge-base then: #1796 ebf8f78, #1803 da323d5 after a merge of main). What it never does is follow the base branch, and the merge ref the audit reads is rebuilt against the live base — so the drift is everything main gained since the last push, which a long queue makes likely. The fix is unchanged; the comment now says that. The first commit's body also cited #1794 as passing and then failing with nothing pushed between; a push landed at 14:24Z and the failing run is on it, so that example is withdrawn.
What
A many-to-many field's junction table now follows the field through its life in the migrations the Builder writes: removed → dropped, renamed → renamed (links kept), collection dropped → its own junctions dropped first.
Ledger:
task:schema-m2m-junction-drop(tracker 123), researchresearch:junction-table-lifecycle-prior-art. The target-side question — dropping a collection that another collection's field still points at — is a product decision and is filed asdecision:dropping-a-collection-another-field-points-atrather than chosen here.What was true on
mainMeasured on
ebf8f78d9, indynamic-collection-schema-service.ts:CREATE TABLE IF NOT EXISTS, a field added later under the same name inherited those links.areFieldTypesCompatiblerefuses to pair fields with no parent column (by design:RENAME COLUMNwould target a name the table never had). So a renamed many-to-many fell to the add/drop loops: the add loop created a fresh, empty junction for the new name and the remove loop skipped the old one — the links vanished from the field, and the old table was orphaned holding them.generateDropTableMigration(collectionName, tableName)dropped the main table and its_localescompanion only; it had no fields to know the junctions by.How
junctionTableNameFor(sourceTable, field)— the author'sjunctionTablewhen set, the generated name otherwise — is what CREATE, DROP and RENAME all ask, so the three cannot name different tables for one field.generateJunctionTablenow uses it too.junctionLifecycle(table, oldFields, newFields)decides renames, drops and creates for the junctions and is appended bygenerateAlterTableMigration; a junction is not a column, so it reads the FULL lists (options.junctionFields, set by the localized save path) rather than the shared-subset the column diff gets — a localized many-to-many is created, renamed and dropped like any other. The column loops skip junction-backed fields.DROP TABLE IF EXISTS <junction>;— spelled the same on all three dialects — and nothing on the parent.detectJunctionRenamepairs a removed and an added junction-backed field by compatibility (same target and relation kind,sameRelationTarget): no compatible pair → drop + create; exactly one → rename; more than one → refused by name (MANY_TO_MANY_RENAME_AMBIGUOUS, the postureFIELD_GROUP_RENAME_AMBIGUOUSalready takes: a wrong pairing hands one field the other's links). A junction the author named keeps its name and emits nothing. OneJunctionShape(table, link columns, two FKs, unique pair, two indexes, referential actions) renders both the CREATE and the RENAME, so the names CREATE writes are the names RENAME moves:ALTER TABLE <old> RENAME TO <new>;then every attachment whose generated name embedded the old table name — PostgreSQLALTER INDEX … RENAME TOandRENAME CONSTRAINT; MySQLRENAME INDEXfor the indexes and the unique pair, andDROP FOREIGN KEY …, ADD CONSTRAINT …for each FK (a FK cannot be renamed there); SQLiteDROP INDEX/CREATE INDEX(constraint names are per-table, nothing to free). Left as they were, the old names would still be taken when a later field reuses the old field name: MySQL would refuse the duplicate FK symbol, andCREATE INDEX IF NOT EXISTSwould find the index on the renamed table and leave the new junction unindexed. A foreign key is renamed in place only when its name changed and its actions did not (PostgreSQL; MySQL cannot rename one); otherwise it is dropped and declared again with the new actions — under a new name in one statement on PostgreSQL, and as two statements wherever one name goes in and out (an author-named junction whose field was renamed with edited actions: one ALTER dropping and adding one name is MySQL bug #68286) and on MySQL always (the combined form is documented as supported only underALGORITHM=INPLACE, which adding a foreign key cannot use withforeign_key_checkson). SQLite cannot alter a constraint, stated in the docblock.junctionTable: a link row does not say which field made it.validateJunctionOwnershiprefuses the save naming both fields; and for a definition saved before that rule,junctionDropsnever drops a table a surviving field still resolves to.detectFieldRenamereturnsnullsilently for a pair with no parent column on either side, instead of warning "types not compatible" and letting the sibling detectors decide anyway — the warning promised a data loss that no longer happens.generateDropTableMigrationtakes the collection's fields (default[]) and drops its own junctions before the companion and the main table, for the reason the companion is dropped first: each carries an FK to<main>.id.collection-metadata-service's delete path passescollection.fields. A junction that another collection's field points at this table through is that field's and stays — see the decision.renameCandidatesandrefuseAmbiguousRename(module-level), so fallow reports zero introduced duplication.Prior art, briefly
Strapi's link tables and Prisma's implicit
_AToBtables are dropped in the same migration when the relation goes; Drizzle Kit asks rename-vs-create interactively; Directus refuses a dependent drop. None has the Builder's shape (generate and apply in one unattended request), so the destructive step here matches the function's existing silentDROP COLUMNposture, and the rename direction is strictly data-preserving. Full survey in the research node.Verification
junction-table-lifecycle.test.ts(48): every case on all three dialects — removal drops the generated or author-named junction; a kept field is left alone (control); storage move drops the junction and adds the column; rename emitsRENAME TOand neitherCREATEnorDROP; every attachment renamed, by exact statement per dialect, and the old table name survives nowhere but in the rename statements; edited referential actions rebuild the FKs instead of renaming them (pg/mysql) and leave SQLite's alone; an author-named junction whose field was renamed with edited actions rebuilds both FKs under their unchanged names as two statements; a removed field never drops a junction a surviving field still resolves to; author-named junction unchanged emits nothing for the pair; rename alongside unrelated edits still renames; different target is a remove+add; nothing pairs → two drops and a create, not a refusal; two renames refused by code; a junction rename and a field-group rename in one save carry both; a localized many-to-many is dropped and renamed from the full lists; collection drop orders junctions → companion → main; no many-to-many adds no drop.junction-ownership-is-exclusive.test.ts(4): two fields naming one junction table refused withJUNCTION_TABLE_SHARED, naming both; two own tables, two generated names, and ajunctionTableon a many-to-one accepted.junction-table-lifecycle.integration.test.ts(5, real SQLite, both collections and the junction built fromgenerateMigrationSQLwith foreign keys enforced as the adapter enforces them, applied the wayrunMigrationapplies text): links survive a rename; the old attachment names are freed so a field reusing the old name gets its own indexes; no table survives a removal; a re-added field starts with zero links; a dropped collection takes its junctions.dynamic-collection-schema-service.test.tscase that pinned the old behaviour ("does NOT auto-rename manyToMany") now pins the new one.914574bcf(main merged in): nextly lint 0, check-types 0, docs-claims 0, dynamic-collections + schema unit 1986/1986, dynamic-collections integration 26/26 on sqlite;pnpm exec fallow audit --changed-since origin/main --gate new-only(3.15.0, the CI's own) pass, 0 introduced across dead code, complexity, duplication, styling.Not in this PR: the target-side drop (decision filed); a DOWN direction for Builder-authored migrations (none exists today; noted in the research as a follow-on); an
onDelete/onUpdateedit on a field whose name is unchanged, which emits no DDL on any dialect for any relationship kind onmaintoday (isFieldModifiednever compares the actions) — filed asfinding:referential-action-edits-emit-no-ddl.Summary by CodeRabbit
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