#35878: Allow to add M2M also in related-model form in admin site
-------------------------------+--------------------------------------
Reporter: David | Owner: (none)
Type: Uncategorized | Status: new
Component: contrib.admin | Version:
Severity: Normal | Resolution:
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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Comment (by David):
To make it work my "workaround" is
{{{#!python
from django import forms
from django.contrib import admin
from django.contrib.admin import widgets
from .models import ModelA, ModelB
class ModelAForm(forms.ModelForm):
others_set = forms.ModelMultipleChoiceField(
queryset=ModelB.objects.all(),
required=False,
widget=widgets.FilteredSelectMultiple(verbose_name='ModelB',
is_stacked=False)
)
def _save_m2m(self):
super()._save_m2m()
self.instance.others_set.set(self.cleaned_data['others_set'],
clear=True)
@admin.register(ModelA)
class ModelAAdmin(admin.ModelAdmin):
@property
def form(self):
class AdminM2MAdminForm(ModelAForm):
"""Helper to display the right widget in admin"""
AdminM2MAdminForm.declared_fields['others_set'].widget =
widgets.RelatedFieldWidgetWrapper(
AdminM2MAdminForm.declared_fields['others_set'].widget,
ModelB.others.through._meta.get_field('modelb').remote_field,
self.admin_site,
)
return AdminM2MAdminForm
}}}
This way the admin displays the "+" button which points to ModelB form in
ModelA admin. Not trivial and quite fragile (some APIs are not
documented).
--
Ticket URL: <https://code.djangoproject.com/ticket/35878#comment:1>
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