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PODjango: ManyToMany widget won't be displayed as double list
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copied!<p>Hi Stackoverflow people, </p> <p>I would like to change the m2m widget in the admin pages (and later in the actual django site) to a more user friendly double list (like this <a href="http://blog.micayael.com/wp-content/uploads/2010/12/doublelist.png" rel="nofollow noreferrer">one</a>).</p> <p>I understand that <a href="https://stackoverflow.com/questions/3006401/django-custom-widget-for-manytomany-field">django.contrib.admin.widgets.FilteredSelectMultiple</a> could do this for me. However, I have trouble to get it to work. I have added the code below to my admin.py, but the widget is not changing when I view the model in the admin app.</p> <p>I have tried to adopt the code from <a href="https://stackoverflow.com/questions/660260/django-admin-form-for-many-to-many-relationship">here</a>. Every SupplierProfile should connect to one or more countries from the WorldBorder model (based on the <a href="https://docs.djangoproject.com/en/dev/ref/contrib/gis/tutorial/#worldborders" rel="nofollow noreferrer">GeoDjango example</a>)</p> <p><strong>Where is the flaw in the code? I can't see why it would not be displayed. Thank you for your help!</strong></p> <pre><code>from django import forms from django.contrib.admin.widgets import FilteredSelectMultiple from django.contrib.gis import admin from django.utils.translation import ugettext_lazy as _ from apps.profile.models import (UserProfile, SupplierProfile) from apps.gis_data.models import WorldBorder class WorldBorderAdmin(admin.ModelAdmin): filter_horizonal = ('name',) class SupplierProfileAdminForm(forms.ModelForm): distribution_location_country = forms.ModelMultipleChoiceField( queryset = WorldBorder.objects.all(), required = False, widget = FilteredSelectMultiple( verbose_name = _('Distribution Country'), is_stacked=False ) ) class Meta: model = SupplierProfile def __init__(self, *args, **kwargs): super(SupplierProfileAdminForm, self).__init__(*args, **kwargs) if self.instance: self.fields['distribution_location_country'].initial = self.instance.distribution_location_country.all() def save(self, commit=True): profile = super(SupplierProfileAdminForm, self).save(commit=False) profile.distribution_location_country = self.cleaned_data['distribution_location_country'] if commit: profile.save() profile.save_m2m() return profile class SupplierProfileAdmin(admin.ModelAdmin): form = SupplierProfileAdminForm admin.site.register(SupplierProfile, admin.OSMGeoAdmin) </code></pre> <p><strong>Updated code of admin.py</strong></p> <p>Is it possible to define the double list as stated below? "distribution_location_country" is the m2m field in my SupplierProfile. For some reason, it is still not coming through.</p> <pre><code>from django import forms from django.contrib.admin.widgets import FilteredSelectMultiple from django.contrib.gis import admin class SupplierProfileAdmin(admin.OSMGeoAdmin): filter_horizontal = ('distribution_location_country', ) admin.site.register(SupplierProfile, SupplierProfileAdmin) </code></pre>

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