#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 | Resolution:
Keywords: forms, disabled | Triage Stage:
field, error, to_field_name | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by thoha):
Because this is for work on a commercial project, I can't give the exact
code, but I'll try to provide generic examples.
The form field get intialised in the FormView via:
{{{
def get_initial(self):
"""
Returns the initial data to use for forms on this view.
"""
initial = super(FormView, self).get_initial()
if self.formfield1 is not None:
initial['formfield1'] = Model.objects.get(pk=self.formfield1)
return initial
}}}
In this case a primary key value is passed, but the problem also occurs
when I pass a value for another field in the model.
The working code in the form is:
{{{
formfield1 = forms.ModelChoiceField(queryset=Model.objects.all(),
to_field_name='corresponding field name in the model', label='item to
use', disabled=True)
}}}
If I leave out the disabled=True I can leave out to_field_name:
{{{
formfield1 = forms.ModelChoiceField(queryset=Model.objects.all(),
label='item to use')
}}}
Then the field initialises properly, too.
This however will fail:
{{{
formfield1 = forms.ModelChoiceField(queryset=Model.objects.all(),
label='item to use', disabled=True)
}}}
The problem does not occur if I initialise the field via a custom __init__
in the form itself. In that case I can leave out to_field_name:
{{{
selected_record = Model.objects.filter(some_flag=True).first()
selected_field_item = selected_record.field1
self.fields['formfield1'] = forms.CharField(max_length=64, label='Field
1', initial=selected_field_item, disabled=True)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/30014#comment:3>
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