CODEWITHSUNDEEP
djangodjango-modelsdjango-admindjango-forms
Daryl
Daryl

Reputation: 1499

Forcing the use of 'filter_horizontal' for re-defined model fields

I have a model field users, but have modified its output, effectively overriding unicode :

from django import forms

class UserModelMultipleChoiceField(forms.ModelMultipleChoiceField):
    def label_from_instance(self, obj):
        return "%s, %s" % (obj.last_name, obj.first_name)

and...

from django.contrib.admin.widgets import FilteredSelectMultiple

class ArticleAdminModelForm(BaseAdminModelForm):

    users = UserModelMultipleChoiceField(
        queryset = User.objects.order_by('last_name', 'first_name'))

    class Meta:
        model = get_model('articles', 'article')
        widgets = BaseAdminModelForm.Meta.widgets

        # Trying to force filter_horizontal -- but to no avail.
        widgets = {
            'users': FilteredSelectMultiple(
                verbose_name="users",
                is_stacked=True,
                attrs={
                    'class': 'filtered',
                })
        })

but I still lose the filter_horizontal widget in the admin. It seems that its inextricably tied to model/dbfields only... I've identified this area in django.contrib.admin.options.py (line 157)

def formfield_for_manytomany(self, db_field, request=None, **kwargs):
    """
    Get a form Field for a ManyToManyField.
    """
    # If it uses an intermediary model that isn't auto created, don't show
    # a field in admin.
    if not db_field.rel.through._meta.auto_created:
        return None
    db = kwargs.get('using')

    if db_field.name in self.raw_id_fields:
        kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.rel, using=db)
        kwargs['help_text'] = ''
    elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
        kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))

So, how to 'force' use of the filter_horizontal for dbfield m2m fields that are redefined in `forms'??

Upvotes: 1

Views: 1528

Answers (1)

ashwoods
ashwoods

Reputation: 2289

Defining the widget inside the user definition inside ArticleAdminModelForm would be the way to do it if you were using the normal ModelMultipleChoiceField. When subclassing a field, python by default does not call its superclass init method (but maybe there is some django magic behind), so you might need to implement the init method yourself as it says in the docs. 

users = forms.ModelMultipleChoiceField(
        widget=FilteredSelectMultiple(
                                      verbose_name='aktive_mitarbeiter',
                                      is_stacked=False
                                     )
        queryset=User.objects.filter(is_active=True)
        )

haven't tested if this works ;)

Upvotes: 1

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