8000 set_rollback's atomic check is inaccurate · Issue #6921 · encode/django-rest-framework · GitHub
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set_rollback's atomic check is inaccurate #6921
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@adamchainz

Description

@adamchainz

Checklist

  • I have verified that that issue exists against the master branch of Django REST framework.
  • I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
  • This is not a usage question. (Those should be directed to the discussion group instead.)
  • This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
  • I have reduced the issue to the simplest possible case.
  • I have included a failing test as a pull request. (If you are unable to do so we can still accept the issue.)

Steps to reproduce

Wrap a view that errors with @non_atomic_requests, but use a transaction around it somehow. The easiest way is to test it from a Django TestCase, which uses transactions around each test. Another way would be to have a custom middleware that does a transaction a different way.

Expected behavior

rest_framework.set_rollback should not call transaction.set_rollback because the view is declared as non-atomic.

Actual behavior

rest_framework.set_rollback calls transaction.set_rollback. Its check for "is this view non-atomic" checks connection.in_atomic_block which as indicated above can be true for a number of reasons.

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