#25113: Field lookup for __not_in
-------------------------------------+-------------------------------------
     Reporter:  tschuy               |                    Owner:  nobody
         Type:  New feature          |                   Status:  new
    Component:  Database layer       |                  Version:  master
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:
                                     |  Unreviewed
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by tschuy):

 * needs_better_patch:   => 0
 * needs_tests:   => 0
 * needs_docs:   => 0


Old description:

> Making a query where I can get all of the objects matching a certain list
> is quite useful. However, Django currently doesn't allow me to get
> objects that DON'T match a list:
>
> `test = ProductPreparation.objects.filter(
>     product=product,
>     preparation__id__not_in=preparations)`
>
> I feel like adding a field lookup for __not_in would be helpful. I've
> created a pull request on Github.

New description:

 Making a query where I can get all of the objects matching a certain list
 is quite useful. However, Django currently doesn't allow me to get objects
 that DON'T match a list:

 `test = ProductPreparation.objects.filter(
     product=product,
     preparation__id__not_in=preparations)`

 I feel like adding a field lookup for `__not_in` would be helpful. I've
 created a pull request on Github:

 https://github.com/django/django/pull/4984

 I've not added any tests to it, as I couldn't find any tests for ``__in``,
 and don't quite know how to test an entire field lookup. Apologies; would
 love pointers.

--

--
Ticket URL: <https://code.djangoproject.com/ticket/25113#comment:1>
Django <https://code.djangoproject.com/>
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