#31693: disabling migrations and postgresql extensions don't mix well
-------------------------------------+-------------------------------------
Reporter: Markus | Owner: nobody
Bertheau |
Type: | Status: new
Cleanup/optimization |
Component: Database | Version: master
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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In [https://code.djangoproject.com/ticket/25388 #25388] a
[https://docs.djangoproject.com/en/dev/ref/settings/#migrate feature] was
introduced to disable migrations for test databases. Before that it was
possible to disable migrations for all apps with MIGRATION_MODULES,
mapping every app to `None`
([https://docs.djangoproject.com/en/dev/ref/settings/#migration-modules as
explained here]). Other code is used for example in pytest-django
([https://github.com/pytest-dev/pytest-
django/blob/ee7858af1a80e0091af4d260c0a70e5766c1196a/pytest_django/migrations.py
here] and [https://github.com/pytest-dev/pytest-
django/blob/ee7858af1a80e0091af4d260c0a70e5766c1196a/pytest_django/fixtures.py#L156-L169
here]) to disable migrations in other ways. All for the speed-up in
creating a database "directly" (circumventing migrations) as opposed to
creating it with the migration mechanism.
Also, [https://docs.djangoproject.com/en/dev/ref/databases/#migration-
operation-for-adding-extensions here] and
[https://docs.djangoproject.com/en/dev/ref/contrib/postgres/operations
/#creating-extension-using-migrations here] it is explained how extensions
should be installed with a migration operation.
Both don't mix, because when disabling migrations, the extension doesn't
get installed. Using features of the extension, for example column types,
doesn't work.
As a side note: postgis functionality is provided through a separate
database engine that provides its own `DatabaseWrapper` that takes care of
installing the postgis extension, independent of the migration mechanism.
Maybe extensions should be configured in settings.DATABASES and then
automatically installed by the postgresql engine.
--
Ticket URL: <https://code.djangoproject.com/ticket/31693>
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