#36550: AssertionError raised when bulk creation model with primary key set via
pre_save (e.g. auto_now_add) on databases with
can_return_columns_from_insert
-------------------------------------+-------------------------------------
     Reporter:  Will-Ruddick         |                    Owner:  (none)
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  dev
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Comment (by Jason Hall):

 Then would we want to modify the test logic and add
 @skipUnlessDBFeature("can_return_columns_from_insert")?

 As far as a fix I was thinking we could ensure Field.pre_save() is applied
 before partitioning objects into with_pk and without_pk, adjust the
 classification to check completeness of all PK fields (including composite
 keys), and only request returning_fields when at least one object is
 missing a pk (skip requesting PKs when they're all known locally).  Would
 that be acceptable?
-- 
Ticket URL: <https://code.djangoproject.com/ticket/36550#comment:9>
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