#28443: MultiValueField does not work with ModelChoiceField?
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Reporter: adam-kral | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.11
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 |
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The code: (where AddressInput is a MultiWidget)
{{{#!python
class AddressFormField(MultiValueField):
widget = AddressInput
def __init__(self, queryset, empty_label="---------",
to_field_name=None, limit_choices_to=None, *args, **kwargs):
fields = (
ModelChoiceField(queryset, empty_label=empty_label,
to_field_name=to_field_name, limit_choices_to=limit_choices_to, *args,
**kwargs),
CharField()
)
super().__init__(fields=fields, require_all_fields=False, *args,
**kwargs)
#self.widget.choices = self.fields[0].widget.choices #### if not
commented out, I get another error: AttributeError:
'RelatedFieldWidgetWrapper' object has no attribute 'decompress'
def compress(self, data_list):
if not data_list[1]:
return None
if not data_list[0]:
raise ValidationError('Invalid address')
return data_list[0]
class AddressForeignKey(ForeignKey):
def formfield(self, **kwargs):
# This is a fairly standard way to set up some defaults
# while letting the caller override them.
defaults = {'form_class': AddressFormField}
defaults.update(kwargs)
return super().formfield(**defaults)
}}}
I get this error: AttributeError: 'AddressInput' object has no attribute
'choices'
Because ModelChoiceField did not declare it. Passing the widget to
ModelChoiceField does not work as it makes a copy if it's an instance.
Thus I set the choices attribute manually as you can see in the commented
out code.
But then I got another error which I didn't resolve: AttributeError:
'RelatedFieldWidgetWrapper' object has no attribute 'decompress'
--
Ticket URL: <https://code.djangoproject.com/ticket/28443>
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