[Django] #31043: From with ModelChoiceField and disabled failed when the initial is model instance and not pk

[Django]

#31043: From with ModelChoiceField and disabled failed when the initial is model
instance and not pk
-----------------------------------------+------------------------
               Reporter:  Eran Keydar    |          Owner:  nobody
                   Type:  Uncategorized  |         Status:  new
              Component:  Uncategorized  |        Version:  2.2
               Severity:  Normal         |       Keywords:
           Triage Stage:  Unreviewed     |      Has patch:  0
    Needs documentation:  0              |    Needs tests:  0
Patch needs improvement:  0              |  Easy pickings:  0
                  UI/UX:  0              |
-----------------------------------------+------------------------
 Got this issue in some more complex example, narrows down to this
 scenario:


 {{{
 class Form1(forms.Form):
     user = forms.ModelChoiceField(
         queryset=get_user_model().objects.all(),
         disabled=True,
         initial=get_user_model().objects.get(pk=1)
     )
     label = forms.CharField()
 }}}

 Then

 {{{
 In [12]: f = Form1(data={'label':'aaa'})

 In [13]: f.is_valid()
 Out[13]: False

 In [14]: f.errors
 Out[14]: {'user': ['Select a valid choice. That choice is not one of the
 available choices.']}

 }}}

 If the initial changed to the pk itself, everything works fine

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31043>
Django <https://code.djangoproject.com/>
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