8000 Fixed #32770 -- Added system check to ensure `django.contrib.postgres` in `INSTALLED_APPS` when using its features. by cliff688 · Pull Request #19480 · django/django · GitHub
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Fixed #32770 -- Added system check to ensure django.contrib.postgres in INSTALLED_APPS when using its features. #19480

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Fixed #32770 -- Added system check to ensure django.contrib.postgres in INSTALLED_APPS when using its features. #19480

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Trac ticket number

ticket-32770

Branch description

Provide a concise overview of the issue or rationale behind the proposed changes.

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  • This PR targets the main branch.
  • The commit message is written in past tense, mentions the ticket number, and ends with a period.
  • I have checked the "Has patch" ticket flag in the Trac system.
  • I have added or updated relevant tests.
  • I have added or updated relevant docs, including release notes if applicable.
  • I have attached screenshots in both light and dark modes for any UI changes.

@cliff688 cliff688 force-pushed the ticket-32770 branch 5 times, most recently from ccac97e to 66c64f6 Compare May 18, 2025 17:54
charettes
charettes reviewed May 19, 2025
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Thanks for tackling it Clifford, I'm sure this will prevent a lot of head scratching!

Any thoughts about using a single error code for constraints, indexes, and fields?

@cliff688 cliff688 changed the title Fixed #32770 -- Added contrib.postgres dependency check for PostgreSQL-specific fields, indexes and constraints. Fixed #32770 -- Added system check to ensure django.contrib.postgres in INSTALLED_APPS` when using its features. May 19, 2025
@cliff688 cliff688 changed the title Fixed #32770 -- Added system check to ensure django.contrib.postgres in INSTALLED_APPS` when using its features. Fixed #32770 -- Added system check to ensure django.contrib.postgres in INSTALLED_APPS when using its features. May 19, 2025
@cliff688
Fixed #32770 -- Added system check to ensure django.contrib.postgres …
5ce1c9c 
…is installed when using its features.

Added postgres.E005 to validate 'django.contrib.postgres' is in INSTALLED_APPS
when using:
* PostgreSQL-specific fields (ArrayField, HStoreField, range fields, SearchVectorField),
* PostgreSQL indexes (PostgresIndex and all subclasses), and
* ExclusionConstraint

The check provides immediate feedback during system checks rather than failing
later with obscure runtime and database errors.

Thanks Simon Charette for the review.
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