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feat(backend): render ALTER TABLE IF [NOT] EXISTS qualifiers for PostgreSQL - #51
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vistart merged 5 commits intoAug 7, 2026
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…greSQL Add PostgresAlterColumnModifierMixin so PostgreSQL emits the vendor qualifiers supported since 9.6: ADD COLUMN IF NOT EXISTS, DROP COLUMN IF EXISTS, and DROP CONSTRAINT IF EXISTS, opt-in via if_not_exists / if_exists on AddColumn / DropColumn / DropTableConstraint. Wire the mixin into PostgresDialect ahead of TableMixin/ConstraintMixin and add the supports_drop_constraint_if_exists capability to PostgresConstraintSupport and PostgresConstraintMixin. Add unit tests covering qualifier and plain forms.
…on with backend dialect test
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Additional details and impacted files@@ Coverage Diff @@
## release/v1.0.0.dev16 #51 +/- ##
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+ Coverage 73.18% 73.24% +0.05%
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Files 277 278 +1
Lines 11333 11364 +31
Branches 1837 1841 +4
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+ Hits 8294 8323 +29
- Misses 2439 2441 +2
Partials 600 600
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…greSQL (#51) * feat(backend): render ALTER TABLE IF [NOT] EXISTS qualifiers for PostgreSQL Add PostgresAlterColumnModifierMixin so PostgreSQL emits the vendor qualifiers supported since 9.6: ADD COLUMN IF NOT EXISTS, DROP COLUMN IF EXISTS, and DROP CONSTRAINT IF EXISTS, opt-in via if_not_exists / if_exists on AddColumn / DropColumn / DropTableConstraint. Wire the mixin into PostgresDialect ahead of TableMixin/ConstraintMixin and add the supports_drop_constraint_if_exists capability to PostgresConstraintSupport and PostgresConstraintMixin. Add unit tests covering qualifier and plain forms. * chore(changelog): rename fragment 50 to new PR #51 * ci: update Python 3.15 beta-2 to rc.1 in test matrix * test: add feature/basic/ddl mirror with provider get_dialect for postgres * test: rename basic/ddl mirror basename to avoid pytest import collision with backend dialect test
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Description
PostgreSQL has supported the vendor
IF [NOT] EXISTSqualifiers onALTER TABLEsince 9.6. This PR addsPostgresAlterColumnModifierMixinso the backend emits:ADD COLUMN IF NOT EXISTSDROP COLUMN IF EXISTSDROP CONSTRAINT IF EXISTSThey are opt-in via
if_not_exists/if_existsonAddColumn/DropColumn/DropTableConstraint;None(default) renders the plain SQL-standard form.Also adds the
supports_drop_constraint_if_existscapability toPostgresConstraintSupport/PostgresConstraintMixin.Requires python-activerecord#115.
Closes #51
Type of change
feat: A new featureBreaking Change
Impact on End-Users:
No backward-incompatible changes are expected for typical end-user applications.
Impact on Backend Developers (Custom Implementations):
No breaking changes.
Related Repositories/Packages
python-activerecord: PR #115 — new qualifier fields on ALTER TABLE actionsTesting
Checklist
changelog.d/51.added.md).