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feat(nextly): a many-to-many field's junction table follows the field through its life - #1796

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Sep 11, 2026
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mobeenabdullah merged 6 commits into
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feat/a-removed-many-to-many-takes-its-junction-with-it

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@mobeenabdullah mobeenabdullah commented Sep 11, 2026 •

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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), research research: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 as decision:dropping-a-collection-another-field-points-at rather than chosen here.

What was true on main

Measured on ebf8f78d9, in dynamic-collection-schema-service.ts:

  • The removed-fields loop skips every field with no parent column — a many-to-many included — so removing one emitted nothing. The junction stayed with every link in it, unread; and because creation is CREATE TABLE IF NOT EXISTS, a field added later under the same name inherited those links.
  • areFieldTypesCompatible refuses to pair fields with no parent column (by design: RENAME COLUMN would 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 _locales companion only; it had no fields to know the junctions by.

How

  • One name. junctionTableNameFor(sourceTable, field) — the author's junctionTable when set, the generated name otherwise — is what CREATE, DROP and RENAME all ask, so the three cannot name different tables for one field. generateJunctionTable now uses it too.
  • One pass, on the full field lists. junctionLifecycle(table, oldFields, newFields) decides renames, drops and creates for the junctions and is appended by generateAlterTableMigration; 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.
  • Removal / storage move. A junction-backed field whose name is gone, or whose storage class changed (e.g. many-to-many → many-to-one), emits DROP TABLE IF EXISTS <junction>; — spelled the same on all three dialects — and nothing on the parent.
  • Rename. detectJunctionRename pairs 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 posture FIELD_GROUP_RENAME_AMBIGUOUS already takes: a wrong pairing hands one field the other's links). A junction the author named keeps its name and emits nothing. One JunctionShape (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 — PostgreSQL ALTER INDEX … RENAME TO and RENAME CONSTRAINT; MySQL RENAME INDEX for the indexes and the unique pair, and DROP FOREIGN KEY …, ADD CONSTRAINT … for each FK (a FK cannot be renamed there); SQLite DROP 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, and CREATE INDEX IF NOT EXISTS would 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 under ALGORITHM=INPLACE, which adding a foreign key cannot use with foreign_key_checks on). SQLite cannot alter a constraint, stated in the docblock.
  • One junction, one field. Two many-to-many fields may not name the same junctionTable: a link row does not say which field made it. validateJunctionOwnership refuses the save naming both fields; and for a definition saved before that rule, junctionDrops never drops a table a surviving field still resolves to.
  • detectFieldRename returns null silently 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.
  • Collection drop. generateDropTableMigration takes 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 passes collection.fields. A junction that another collection's field points at this table through is that field's and stays — see the decision.
  • The three rename detectors shared a nine-line candidate prologue and two refusal blocks after the mirroring; extracted into renameCandidates and refuseAmbiguousRename (module-level), so fallow reports zero introduced duplication.

Prior art, briefly

Strapi's link tables and Prisma's implicit _AToB tables 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 silent DROP COLUMN posture, 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 emits RENAME TO and neither CREATE nor DROP; 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 with JUNCTION_TABLE_SHARED, naming both; two own tables, two generated names, and a junctionTable on a many-to-one accepted.
  • junction-table-lifecycle.integration.test.ts (5, real SQLite, both collections and the junction built from generateMigrationSQL with foreign keys enforced as the adapter enforces them, applied the way runMigration applies 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.
  • The existing dynamic-collection-schema-service.test.ts case that pinned the old behaviour ("does NOT auto-rename manyToMany") now pins the new one.
  • Break-verified with wrong implementations for each case (never drop; no junction rename; drop ignores fields; pg renames FKs regardless of the actions; re-declaration with the old actions; sqlite emitting constraint statements; skip a FK whose name is unchanged; drop a shared junction; validation never refuses; MySQL back to one combined statement): each kills exactly the tests named for it and nothing else; the integration oracle fails 2 under "never drop". Restored: all green.
  • Gates at 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 verifiable here: the PostgreSQL and MySQL rename statements against a live server — no Docker on this machine and no integration test applies Builder DDL on those legs; the statements follow the dialects' documented forms, with the two MySQL restrictions above designed around rather than tested.

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/onUpdate edit on a field whose name is unchanged, which emits no DDL on any dialect for any relationship kind on main today (isFieldModified never compares the actions) — filed as finding:referential-action-edits-emit-no-ddl.

Summary by CodeRabbit

  • New Features

    • Many-to-many relationship changes now preserve links when a field is renamed.
    • Removing a relationship field removes its junction table; re-adding it starts with no previous links.
    • Deleting a collection also removes its associated junction tables.
    • Simultaneously renaming multiple many-to-many fields is refused when the migration cannot determine the correct table mapping.
  • Documentation

    • Documented many-to-many junction-table migration behavior and rename limitations.

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Review Change StackReview Change Stack

📝 Walkthrough

Walkthrough

Many-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.

Changes

Many-to-many junction lifecycle

Layer / File(s) Summary
Junction rename and lifecycle
packages/nextly/src/domains/dynamic-collections/services/dynamic-collection-schema-service.ts
The schema service detects compatible junction renames, preserves links, updates dialect-specific indexes and constraints, rejects ambiguous renames, and handles junction creation and removal.
Collection drop cleanup
packages/nextly/src/domains/dynamic-collections/services/dynamic-collection-schema-service.ts, packages/nextly/src/domains/dynamic-collections/services/dynamic-collection-service.ts, packages/nextly/src/domains/collections/services/collection-metadata-service.ts
Collection drop migration generation receives field definitions and drops owned junction tables before companion and main tables.
Lifecycle validation and coverage
packages/nextly/src/domains/dynamic-collections/services/dynamic-collection-validation-service.ts, packages/nextly/src/domains/dynamic-collections/__tests__/*, docs/dynamic-collections/index.mdx
Validation rejects shared explicitly named junction tables. Unit and SQLite integration tests cover lifecycle behavior across dialects. Documentation describes rename, removal, recreation, and ambiguity rules.

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
Loading

Merge Risk: 🟡 Moderate · up to 91457

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)

Check name Status Explanation Resolution
Description check ⚠️ Warning 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 se… Add the required template sections and confirm the change type, changeset and semver bump, checklist items, target branch, and documentation status.
✅ Passed checks (4 passed)
Check name Status Explanation
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 8 files. (1 skipped: 1 …
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Title check ✅ Passed The title clearly and concisely describes the main change: many-to-many junction tables follow their fields through creation, removal, and renaming.
Full details: Description check

Explanation

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.

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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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📒 Files selected for processing (7)
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  • packages/nextly/src/domains/collections/services/collection-metadata-service.ts
  • packages/nextly/src/domains/dynamic-collections/__tests__/dynamic-collection-schema-service.test.ts
  • packages/nextly/src/domains/dynamic-collections/__tests__/junction-table-lifecycle.integration.test.ts
  • packages/nextly/src/domains/dynamic-collections/__tests__/junction-table-lifecycle.test.ts
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Reviewed commit: 59ee206009

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Whole-Repository Code Hygiene Summary

Full dead-code, duplication, and complexity report for the PR branch as it stands now. Playground is excluded. Quality gate enforcement on introduced issues is performed by the Changed files job.

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Warning

Review needed

⚠️ 73 code issues · ⚠️ 691 clone groups · ⚠️ 1044 health findings

See inline review comments for per-finding details.

Code issues (73)
Category Count
Unused files 2
Unused exports 5
Unused dependencies 19
Unused devDependencies 6
Unresolved imports 2
Unlisted dependencies 1
Circular dependencies 38
Duplication (691 groups · 28913 lines · 4.1%)
Locations Lines Tokens
schemas/_dialect-bundles/mysql.relations.ts:40-134
schemas/_dialect-bundles/postgres.relations.ts:40-134
schemas/_dialect-bundles/sqlite.relations.ts:40-134
95 593
cli/commands/db-sync-demote.ts:70-75
cli/commands/db-sync-promote.ts:38-43
cli/commands/dev-build.ts:100-105
cli/commands/dev-build.ts:179-184
cli/commands/dev-build.ts:299-304
cli/commands/dev-build.ts:411-416
cli/commands/dev-build.ts:552-557
cli/commands/dev-server.ts:575-580
cli/commands/dev-server.ts:840-845
cli/commands/dev-server.ts:1143-1148
cli/commands/migrate-field-groups.ts:110-115
6 70
entries/EntryList/EntryTableSkeleton.tsx:74-98
collection/components/CollectionTableSkeleton.tsx:94-118
field-group/components/FieldGroupTableSkeleton.tsx:90-114
plugins/components/PluginsTableSkeleton.tsx:86-110
singles/components/SinglesTableSkeleton.tsx:77-101
src/components/table-skeleton.tsx:100-124
25 89
collections/config/validate-config.ts:380-433
field-groups/config/validate-field-group.ts:185-238
singles/config/validate-single.ts:190-243
54 152
dispatcher/handlers/collection-dispatcher.ts:925-967
field-groups/services/field-group-table-provisioning.ts:186-236
singles/services/reconcile-single-companion.ts:110-160
51 149

… and 686 more groups.

Across 422 files.

Complexity (1044 functions above threshold)
File Function Severity Cyclomatic Cognitive CRAP Lines
singles/services/single-mutation-service.ts:981 <arrow> critical 251 ! 324 ! 13859.2 ! 1625
collections/services/collection-mutation-service.ts:6262 <arrow> critical 175 ! 178 ! 6790 ! 1288
src/init/reload-config.ts:1319 applyReload critical 144 ! 228 ! 4623 ! 1433
shared/lib/entry-validation.ts:223 validateFieldValue critical 109 ! 157 ! 2675.3 ! 432
blocks-engine/src/measure-bytes.ts:646 surveyDocument critical 102 ! 250 ! 137.1 ! 658

5021 files, 77035 functions analyzed (thresholds: cyclomatic > 20, cognitive > 15, CRAP >= 30)

Codebase health

Metric Value
Maintainability 91.7 / 100
Avg complexity 1.8

Tip

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Add /** @public */ above exports to preserve them.

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commit: 914574b

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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.
… 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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mobeenabdullah added a commit that referenced this pull request Sep 11, 2026
…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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  • packages/nextly/src/domains/dynamic-collections/services/dynamic-collection-schema-service.ts
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@mobeenabdullah
mobeenabdullah merged commit 10ef8d9 into main Sep 11, 2026
33 of 38 checks passed
mobeenabdullah added a commit that referenced this pull request Sep 11, 2026
… 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.
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