#26970: disabled modelMultipleChoiceField does not validate anymore
-------------------------------+--------------------
     Reporter:  karyon         |      Owner:  nobody
         Type:  Uncategorized  |     Status:  new
    Component:  Uncategorized  |    Version:  1.10
     Severity:  Normal         |   Keywords:
 Triage Stage:  Unreviewed     |  Has patch:  0
Easy pickings:  0              |      UI/UX:  0
-------------------------------+--------------------
 i have the following test:

 {{{
     def test_foo(self):
         # Course has an m2m to degrees
         course = mommy.make(Course, semester=mommy.make(Semester),
 degrees=[mommy.make(Degree)])

         # get_form_data_from_instance creates a dict with all the
 attributes
         form_data = get_form_data_from_instance(ContributorCourseForm,
 course)

         form = ContributorCourseForm(form_data, instance=course)
         self.assertTrue(form.is_valid())

         # recreate form
         form = ContributorCourseForm(form_data, instance=course)
         # disable degrees field
         form.fields['degrees'].disabled = True
         self.assertTrue(form.is_valid())
 }}}

 the second assert fails. form.errors says "degrees: Enter a list of
 values." which doesn't make sense, since 1. it does have a degree (the
 form renders correctly with that degree selected), and 2. this shouldn't
 happen just because the field is disabled.

 this showed up in 3744fc1666c41aeb4ed44f31605bafdb413b42bc, the fix for
 https://code.djangoproject.com/ticket/26917#comment:1

--
Ticket URL: <https://code.djangoproject.com/ticket/26970>
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