fix(core): Model.sync({ schema }) should not move models with an explicit default schema by papandreou · Pull Request #18503 · sequelize/sequelize

papandreou · 2026-09-26T10:42:44Z

Summary

Model.sync({ schema }) is documented to only move models that don't declare their own schema ("This can be overridden for each table in sequelize.define"), but the guard compared the model's resolved table.schema against the dialect's default schema. A model explicitly declaring { schema: 'public' } on Postgres resolves to the exact same string as a model with no schema at all, so both were silently moved into the sync-time schema instead of the explicit one being left alone.
Fixed by consulting the model's own (pre-resolution) options.schema to tell "no schema declared" apart from "explicitly declared the default schema", instead of comparing already-resolved schema strings.

Test plan

Added a unit test reproducing the bug (model explicitly declaring the default schema getting moved by sync({ schema })) and asserting the fix
packages/core/test/unit/model/** unit tests pass (396 passing, 0 failing)
tsc --noEmit and eslint clean on touched files

Summary by CodeRabbit

Bug Fixes
- Model synchronization now preserves an explicitly declared default schema, even when a different schema is supplied as an option. The table remains in the model’s declared schema.
- When a model has no explicitly declared schema, the schema option determines where its table is created, including for scoped model variants.

…icit default schema Model.sync()'s schema option is meant to only move models that don't declare their own schema (per the docs: "This can be overridden for each table in sequelize.define"). But the guard compared the model's resolved table.schema against the dialect's default schema, and an explicitly-declared schema equal to the default (e.g. { schema: 'public' } on Postgres) is indistinguishable from no schema at all once resolved - both just read as 'public'. That silently moved such models into the sync-time schema instead of leaving them alone. Use the model's own (pre-resolution) options.schema to tell the two cases apart instead. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

coderabbitai · 2026-09-26T10:43:07Z

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📒 Files selected for processing (2)

packages/core/src/model.js
packages/core/test/unit/model/sync.test.ts

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packages/core/test/unit/model/sync.test.ts

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📝 Walkthrough

Walkthrough

Model.sync now checks the initial model schema declaration when applying a sync-time schema. Tests cover models and scoped variants with and without an explicitly declared schema.

Changes

Model sync schema handling

Layer / File(s)	Summary
Schema selection and test `packages/core/src/model.js`, `packages/core/test/unit/model/sync.test.ts`	`Model.sync` applies the sync-time schema to default-schema tables when the initial model has no declared schema. If the initial model declares a schema, the table keeps that schema. Tests cover both cases for models and scoped variants.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to be07d

The schema-selection change appears ready to merge after normal checks.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 9fdee

Preserving an explicitly declared default schema fixes the intended behavior, but in configurations that use database search paths, synchronization may still act on a different schema than that declaration suggests. Destructive synchronization makes the conditional impact significant.

Retained concerns

Medium · security · inferred: With an effective non-default search path, retaining the declared default schema produces an unqualified DDL table name. A privileged sync, particularly with force, can act on the search-path-selected table while the model declares the default schema; the base path qualified the differing sync schema.

Security review details

Security Blast Radius

inferred — The independently affected scope is limited to schemas and dependent objects on which the application's database credential can perform sync DDL. Which tenants, if any, are reachable is not established by the available configuration.

Security Findings and Attack Paths

inferred — If an application invokes privileged sync with a differing schema option while an independently influenced searchPath is effective, the changed unqualified DDL can target the search-path-selected schema. No evidence establishes an attacker-accessible sync call or controllable searchPath in a deployed application.

Trust Boundaries and Controls

observed — The effective-search-path gate limits this path: unsupported dialects, disabled prepending, or queries with supportsSearchPath set to false do not carry the option through core query execution. The patch does not itself grant database privileges.

Resilience and Maintainability Implications

observed — The added unit test checks the generated CREATE TABLE identifier for an explicit default schema, but does not exercise an effective searchPath or force drop. The inspected sync path has no explicit rollback after partial DDL failure.

Hardening Proposals

proposed — For privileged sync, define and verify which authority selects the physical schema when a declared default schema, a differing sync schema, and an effective searchPath coexist; include force and existence-check behavior in that verification.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preventing Model.sync({ schema }) from moving models with an explicitly declared default schema.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
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.

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Actionable comments posted: 1

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Inline comments:
In `@packages/core/src/model.js`:
- Line 859: Update the schema-selection check in model initialization to
distinguish whether the initial model declared a schema from the variant’s
resolved options.schema. Preserve the original declaration state through
_withScopeAndSchema and use it when applying sync-time schema overrides, so
scoped models without a declared schema still target the schema passed to sync.

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📒 Files selected for processing (2)

packages/core/src/model.js
packages/core/test/unit/model/sync.test.ts

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…ants CodeRabbit correctly flagged a regression in the previous commit: scoped variants (Model.withScope(...), Model.withSchema(...)) always carry a concrete, resolved schema in their own model options (via _createModelVariant), even when the underlying model never declared one. Checking the variant's own modelDefinition.options.schema therefore misidentified every scoped variant as having explicitly pinned its schema, so Model.withScope('someScope').sync({ schema: 'tenant' }) silently stopped moving models that never declared a schema at all. Fixed by consulting the initial model's options (via getInitialModel()) instead of the variant's own options - that flag is unaffected by scope/schema variant creation, since withScope()/withSchema() always resolve back to the initial model before creating a new variant. The existing non-default-schema guard (which already handled explicit withSchema(other) calls correctly) is left untouched. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

papandreou · 2026-09-26T12:06:26Z

Fixed the withScope regression you flagged — thanks for catching it. Now consulting the initial model's declared schema (via getInitialModel()) instead of the variant's own resolved options, since _createModelVariant always threads through a concrete schema even when none was ever explicitly requested. Added regression tests for both the withScope-on-implicit-schema and withScope-on-explicit-default-schema cases.

papandreou requested a review from a team as a code owner September 26, 2026 10:42

papandreou requested review from WikiRik and ephys September 26, 2026 10:42

coderabbitai Bot reviewed Sep 26, 2026

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Comment thread packages/core/src/model.js Outdated

papandreou and others added 2 commits September 26, 2026 13:00

prettier --write packages/core/test/unit/model/sync.test.ts

28eb955

Empty commit to trigger new build

be07d6c

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fix(core): Model.sync({ schema }) should not move models with an explicit default schema - #18503

fix(core): Model.sync({ schema }) should not move models with an explicit default schema#18503
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sequelize:mainfrom
papandreou:fix/sync-schema-respects-explicit-default-schema

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