#31721: The function modelform_factory does not consider the formfield_callback 
of
the form that it recieves as argument
-----------------------------------+--------------------------------------
     Reporter:  Klaas-Jan Gorter   |                    Owner:  nobody
         Type:  New feature        |                   Status:  new
    Component:  Forms              |                  Version:  2.2
     Severity:  Normal             |               Resolution:
     Keywords:  modelform_factory  |             Triage Stage:  Unreviewed
    Has patch:  0                  |      Needs documentation:  0
  Needs tests:  0                  |  Patch needs improvement:  0
Easy pickings:  0                  |                    UI/UX:  0
-----------------------------------+--------------------------------------
Changes (by Simon Charette):

 * cc: Claude Paroz (added)
 * type:  Bug => New feature


Comment:

 I was always the impression that `formfield_callback` was solely an
 allowed kwarg of the `modelform_factory` function and its friends.

 > I believe this test has been removed from version 2, because I find no
 equivalent test in tests/model_formsets_regress.

 From what I can see the patch from #18573 was never committed and thus
 nothing was actually removed over the years.

 Given
 
[https://github.com/django/django/blob/3b1cb78063466e996cbb042e44aadfac30df73fa/tests/model_forms/tests.py#L2820
 no tests exists for this behavior] and that
 [https://docs.djangoproject.com/en/3.0/search/?q=formfield_callback it's
 not documented] I'll change this bug report to a feature request. That
 seems like a really niche use case but since I don't use Django forms much
 myself nowadays I'll let other folks chime in.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31721#comment:5>
Django <https://code.djangoproject.com/>
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