#30014: Initialising disabled ModelChoiceField yields 'Select a valid 
choice'-error
despite initialised option being valid
-------------------------------------+-------------------------------------
               Reporter:  thoha      |          Owner:  nobody
                   Type:  Bug        |         Status:  new
              Component:  Forms      |        Version:  1.11
               Severity:  Normal     |       Keywords:  forms, disabled
           Triage Stage:             |  field, error
  Unreviewed                         |      Has patch:  0
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 I have a form with a ModelChoiceField that gets initialised to a specific
 value using get_initial in that form's View. This value is a valid choice
 for that Model. I don't want the user to be able to change the option on
 the form, but it needs to be displayed nonetheless.

 When I set disabled=True on that field in forms.py, submitting the form
 yields the following error:

 <ul class="errorlist"><li>fieldname<ul class="errorlist"><li>Select a
 valid choice. That choice is not one of the available
 choices.</li></ul></li></ul>.

 Firstly, I would like to comment on the general quality of the error
 message, as it is not very useful: It does not return ''which'' choice it
 considers invalid. Including this information would make the message much
 more informative, and would avoid sending people on a wild goose chase to
 discover what the message could possibly mean.

 Secondly, if a field is disabled but does contain a valid choice,
 validating the form should work and not trigger an error.

 This is probably related to the bugfix for this bug:
 https://code.djangoproject.com/ticket/28387

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30014>
Django <https://code.djangoproject.com/>
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