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fix(policy): compare create-input enum fields as text on PostgreSQL - #2897
Create rules are evaluated against a VALUES table built from the input, where enum fields are cast to text (text[] for enum lists). When a create rule compares such a field with a stored native enum column, PostgreSQL rejects the query with 42883:
@@allow('create', anchor.approvals?[permissions == this.permissions])
// operator does not exist: "Permission"[] = text[]
The same happens for scalar enums, e.g. permission == anchor.defaultPermission or anchor.approvals?[permission == this.permission] ("Permission" = text).
Fix
This is the create-input counterpart of #2869, which handled before() enum fields in post-update rules. A new isCreateInputEnumComparison check compares both operands as text, as #2869 does, but only when all of these hold:
one operand is an enum field of the entity being created: this.field, or a bare field at the top level of the rule (alias === thisAlias). Inside collection predicates, including self-relations, a bare field is a stored row;
the other operand is a stored field of the same enum. Comparisons with literals keep their current SQL, so the name mapper still maps @map-ed values;
Enum arrays keep exact equality semantics (order and multiplicity), because PostgreSQL renders enum[] and text[] in the same canonical text form. before() handling is unchanged.
Tests
New tests/regression/test/issue-2866.test.ts (PostgreSQL):
enum list create rule: a matching list passes; a different order, a subset and an extra duplicate are rejected;
enum list != in an update rule (stored vs. stored, unchanged behavior);
scalar enum create rule, both top level (permission == anchor.defaultPermission) and inside a collection predicate (this.permission);
self-relation predicates, with a @map-ed enum literal (parent.children?[status != ACTIVE]) and a field compared with this (parent.children?[kind == this.kind]).
The create tests fail on dev with the 42883 error from the issue.
Locally:
tests/regression: 285 passed on both PostgreSQL 16 and SQLite;
tests/e2eorm/policy: all passed on SQLite. On PostgreSQL everything passes except 4 now() tests, which fail the same way on dev without this change because the local server runs in Europe/Istanbul rather than UTC;
lint and tsc for plugin-policy are clean.
Summary by CodeRabbit
Bug Fixes
Policy comparisons now handle enum values from stored and newly created records more consistently, including comparisons through related fields and collection predicates.
Enum array comparisons correctly account for matching values, reordered values, missing values, and duplicates.
Tests
Added regression coverage for policy evaluation involving enum fields and arrays during create and update operations, as well as self-relations.
Create rules are evaluated against a VALUES table built from the input,
where enum fields are cast to text (text[] for enum lists). Comparing such
a field with a stored native enum column, e.g.
`anchor.approvals?[permissions == this.permissions]` or
`permission == anchor.defaultPermission`, fails on PostgreSQL with
42883 (operator does not exist: "Permission"[] = text[]).
Extend the existing `before()` handling (zenstackhq#2869) to the create input: when
either operand is an enum field of the entity being created, both sides
are compared as text. Enum arrays keep their order and multiplicity, since
PostgreSQL renders enum[] and text[] in the same canonical text form.
Fixeszenstackhq#2866
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Walkthrough
The policy expression transformer now detects eligible create-input enum comparisons and casts comparison operands to text. PostgreSQL regression tests cover enum-array and scalar enum policies, including relation predicates and self-referential folder predicates.
Changes: Policy enum comparison
Layer / File(s)
Summary
Detect and cast create-input enum comparisons packages/plugins/policy/src/expression-transformer.ts
During create, the transformer identifies eligible input enum fields compared with stored fields of the same enum type, excluding enums with @map values. It applies text casts and retains support for before() enum comparisons.
zenstackhq/zenstack#2869 — Casts comparison operands to text for enum fields accessed through before(); this change also handles eligible create-input fields.
zenstackhq/zenstack#2895 — Includes PostgreSQL enum-comparison changes in the policy expression transformer.
Suggested reviewers:theluckystrike, ymc9
Merge Risk: Minimal · up to 7d78e
The mapped-enum comparison concern is addressed by the current guard. No remaining issue identified here prevents merging after normal checks.
Pre-merge checks: 5
Check name
Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title "fix(policy): compare create-input enum fields as text on PostgreSQL" matches the main change. The summary shows enum comparisons during create operations are now cast to text when one opera…
Linked Issues check
Issue #2866 requires create-policy equality between a stored enum array and candidate input to work without PostgreSQL 42883, while preserving order and multiplicity. expression-transformer.ts casts…
Out of Scope Changes check
The transformer change and regression tests address enum comparisons in create policies and protect related behavior. Scalar enum checks, mapped-enum and self-relation cases, and the update comparison…
Docstring Coverage
No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Full details: Title check
Explanation
The title "fix(policy): compare create-input enum fields as text on PostgreSQL" matches the main change. The summary shows enum comparisons during create operations are now cast to text when one operand is a create-input enum field and the other is a stored enum field of the same type. The objectives describe the same fix for PostgreSQL 42883 errors in create policies. The added regression tests for issue #2866 also support this focus. The title is concise, specific, and follows the conventional commit style.
Full details: Linked Issues check
Explanation
Issue #2866 requires create-policy equality between a stored enum array and candidate input to work without PostgreSQL 42883, while preserving order and multiplicity. expression-transformer.ts casts both operands to text only when exactly one operand is an eligible create-input enum field and the other is a stored field of the same unmapped enum. issue-2866.test.ts checks a matching array and rejects reordered, subset, and duplicate-value arrays. It also covers scalar create comparisons and stored-to-stored update behavior.
Full details: Out of Scope Changes check
Explanation
The transformer change and regression tests address enum comparisons in create policies and protect related behavior. Scalar enum checks, mapped-enum and self-relation cases, and the update comparison test verify boundaries of the same fix. No unrelated change is shown.
Full details: Docstring Coverage
Explanation
No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 0 functions across 2 files.
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Actionable comments posted: 2
🪄 Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix review comments
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Inline comments:
Review comments at @packages/plugins/policy/src/expression-transformer.ts:
- Around line 348-349: Update the preflight create-policy flow in
enforcePreCreatePolicyForOne so enum values, including array elements, use
database labels before entering the VALUES table, or normalize both operands
consistently before text comparison. Ensure the fix handles both equality and
inequality comparisons; use the enum-field detection in isValuesTableEnumField
to locate the relevant transformation logic.
- Line 1229: Update the field classification in the ExpressionUtils.isField
branch so it identifies create-input fields by the VALUES-table row alias or
scope, not by modelOrType equaling thisType. Keep self-relation stored-row
fields eligible for direct enum-value mapping by QueryNameMapper.
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Narrow the create-input text comparison from the previous commit:
- A bare field counts as create input only at the rule's top level
(`alias === thisAlias`). Inside collection predicates, including
self-relations, it is a stored row and is left untouched.
- The cast is applied only when the other operand is a stored field of
the same enum. Comparisons with literals keep their current SQL, so the
name mapper still maps `@map`-ed enum values.
- Enums with `@map`-ed values are skipped: the input row holds enum names
while stored columns hold mapped values, so comparing them as text
could turn `!=` into an allow. Their behavior stays as on dev (zenstackhq#2867).
Adds a self-relation regression case that was wrongly allowed before.
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Fixes #2866
Problem
Create rules are evaluated against a
VALUEStable built from the input, where enum fields are cast totext(text[]for enum lists). When a create rule compares such a field with a stored native enum column, PostgreSQL rejects the query with 42883:The same happens for scalar enums, e.g.
permission == anchor.defaultPermissionoranchor.approvals?[permission == this.permission]("Permission" = text).Fix
This is the create-input counterpart of #2869, which handled
before()enum fields in post-update rules. A newisCreateInputEnumComparisoncheck compares both operands as text, as #2869 does, but only when all of these hold:this.field, or a bare field at the top level of the rule (alias === thisAlias). Inside collection predicates, including self-relations, a bare field is a stored row;@map-ed values;@map-ed values. For those, the input row holds enum names while stored columns hold mapped values, so a text comparison would be wrong (and!=could allow). They keep their current behavior, and the general fix belongs to Policy expressions do not map@map-ed enum values in several comparison shapes #2867.Enum arrays keep exact equality semantics (order and multiplicity), because PostgreSQL renders
enum[]andtext[]in the same canonical text form.before()handling is unchanged.Tests
New
tests/regression/test/issue-2866.test.ts(PostgreSQL):!=in an update rule (stored vs. stored, unchanged behavior);permission == anchor.defaultPermission) and inside a collection predicate (this.permission);@map-ed enum literal (parent.children?[status != ACTIVE]) and a field compared withthis(parent.children?[kind == this.kind]).The create tests fail on
devwith the 42883 error from the issue.Locally:
tests/regression: 285 passed on both PostgreSQL 16 and SQLite;tests/e2eorm/policy: all passed on SQLite. On PostgreSQL everything passes except 4now()tests, which fail the same way ondevwithout this change because the local server runs inEurope/Istanbulrather than UTC;lintandtscforplugin-policyare clean.Summary by CodeRabbit