#27985: Converting `Foo.objects.filter(bar=None)` to an `IsNull` too early.
-------------------------------------+-------------------------------------
     Reporter:  Jarek Glowacki       |                    Owner:  Sergey
                                     |  Fedoseev
         Type:  Bug                  |                   Status:  closed
    Component:  Database layer       |                  Version:  master
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:  fixed
     Keywords:  sql None NULL        |             Triage Stage:  Accepted
  transform                          |
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Simon Charette):

 Here's a PR implementing the `EmptyResultSet` approach that could be used
 in a 2.0 backport.

 https://github.com/django/django/compare/master...charettes:ticket-27985

 I really think we should deprecating this path in 2.1+ though given the
 ambiguity of the lookup when `instance._state.adding`, I feel like this
 would be inline with the changes to prevent
 `instance.m2m.add(unsaved_instance)`.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/27985#comment:12>
Django <https://code.djangoproject.com/>
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