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feat(backend): add PostgreSQL Row-Level Security POLICY DDL expressions - #52
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Add PostgresCreatePolicyExpression, PostgresAlterPolicyExpression, and PostgresDropPolicyExpression (plus PolicyType/PolicyCommand/AlterPolicyMode enums) so RLS policies can be administered through the Expression-Dialect pipeline. The new PostgresPolicyMixin provides version-gated formatters (PG 9.5+ for basic CREATE/ALTER/DROP, 10+ for AS RESTRICTIVE and explicit AS PERMISSIVE, 15+ for the CURRENT_ROLE role keyword) and capability switches; PostgresPolicySupport is the matching @runtime_checkable Protocol. POLICY is a PostgreSQL extension, not SQL-standard, so it is implemented in the postgres backend package only; the core library is untouched. Note: changelog.d/0.added.md is a placeholder fragment — rename it to the actual PR number once assigned before merging.
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## release/v1.0.0.dev16 #52 +/- ##
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…ns (#52) * feat(backend): add PostgreSQL Row-Level Security POLICY DDL expressions Add PostgresCreatePolicyExpression, PostgresAlterPolicyExpression, and PostgresDropPolicyExpression (plus PolicyType/PolicyCommand/AlterPolicyMode enums) so RLS policies can be administered through the Expression-Dialect pipeline. The new PostgresPolicyMixin provides version-gated formatters (PG 9.5+ for basic CREATE/ALTER/DROP, 10+ for AS RESTRICTIVE and explicit AS PERMISSIVE, 15+ for the CURRENT_ROLE role keyword) and capability switches; PostgresPolicySupport is the matching @runtime_checkable Protocol. POLICY is a PostgreSQL extension, not SQL-standard, so it is implemented in the postgres backend package only; the core library is untouched. Note: changelog.d/0.added.md is a placeholder fragment — rename it to the actual PR number once assigned before merging. * ci: bump postgres 19 job from 19beta1 to 19beta2 (PGQ) * chore: add changelog fragment for PR #52
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Description
Adds PostgreSQL Row-Level Security (RLS)
POLICYDDL expressions so policies can be administered through the Expression-Dialect pipeline. New expressions:PostgresCreatePolicyExpression—CREATE POLICY ... ON ... AS ... FOR ... TO ... USING ... WITH CHECK ...PostgresAlterPolicyExpression—ALTER POLICY ... RENAME TO .../ALTER POLICY ... TO ... USING ... WITH CHECK ...PostgresDropPolicyExpression—DROP POLICY ... [CASCADE | RESTRICT]plus
PolicyType,PolicyCommand,AlterPolicyModeenums inexpression/ddl/policy.py.The new
PostgresPolicyMixinprovides version-gatedformat_*methods and capability switches:CREATE/ALTER/DROP POLICYAS RESTRICTIVEand explicitAS PERMISSIVEkeyword (AS PERMISSIVEis silently omitted on 9.5)CURRENT_ROLErole keyword in theTOclausePostgresPolicySupportis the corresponding@runtime_checkableProtocol, wired into the dialect alongside the mixin.Design note (归层):
POLICYis a PostgreSQL extension, not a SQL-standard statement, so all implementation lives in thepython-activerecord-postgresbackend package only; the core library (backend/expression/statements/) is untouched.Scope note: This PR intentionally does NOT include the RLS
ALTER TABLE ... ENABLE/FORCE/DISABLE ROW LEVEL SECURITYexpressions nor policy introspection (planned as a follow-up).Type of change
feat: A new featureci: Bump thepostgres 19CI job from19beta1to19beta2(PGQ)Breaking Change
Impact on End-Users:
No backward-incompatible changes; this adds opt-in RLS policy expressions only.
Impact on Backend Developers (Custom Implementations):
No breaking changes.
Related Repositories/Packages
None — PostgreSQL-only feature, contained within this repository.
Testing
Test Plan:
tests/rhosocial/activerecord_postgres_test/feature/backend/postgres/test_policy.py(64 assertions).test_ddl_protocols.py(2 runtime-checkable conformance cases).PYTHONPATH=src pytest tests/.test.yml): matrix of Python 3.8–3.14 × PostgreSQL 9–18 allsuccess; PG19beta2/PGQ jobsuccess(5353 passed, skipped = the extension-not-available/version-gated cases).Checklist
changelog.d/0.added.md— placeholder; will be renamed to the PR number once assigned).Additional Notes
changelog.d/0.added.md. After this PR is created, the fragment will be renamed tochangelog.d/<pr_number>.added.mdin a follow-up commit (per.claude/version_control.mdand the49→50precedent).