django-genfkadmin 0.1.4

No frills GenericForeignKeys for your Django Admin

Django GenericFKAdmin

Using GenericForeignKey in your Django models is cool, the default behavior of Django Admin is not. This package allows you to replace the content_type and object_id fields in your admin forms with a single input that is prefilled with only the models related through GenericRelation fields.

Setup

Install

pip install django-genfkadmin

uv add django-genfkadmin

Usage

Using this package is pretty simple.

1. Create a subclass of GenericFKModelForm for your model.
2. Create a subclass of GenericFKAdmin for your model.
3. ???
4. Profit!

e.g. in your admin.py

from genfkadmin.admin import GenericFKAdmin
from genfkadmin.forms import GenericFKModelForm


class PetAdminForm(GenericFKModelForm):

    class Meta:
        model = Pet
        fields = "__all__"


@admin.register(Pet)
class PetAdmin(GenericFKAdmin):
    form = PetAdminForm

Providing a filter_callback

If you want to further filter the queryset (perhaps by something related to the parent instance of your model with GenericForeignKey) you can pass a partial with a keyword argument of filter_callback as follows.

@admin.register(MarketingMaterial)
class MarketingMaterialAdmin(GenericFKAdmin):
    form = MarketingMaterialAdminForm

    def get_form(self, request, obj=None, change=False, **kwargs):
        if obj:
            self.form = partial(
                MarketingMaterialAdminForm,
                filter_callback=lambda queryset: queryset.filter(customer=obj.customer),
            )
        else:
            # this is important, otherwise, 1. add -> 2. change -> 3. add
            # will use the filter on 2. in 3.
            self.form = MarketingMaterialAdmin
        return super().get_form(request, obj=obj, change=change, **kwargs)

Now when loading an existing MarketingMaterial, the content_object options are filtered by the chosen Customer

A complete example django app exists in this repository at here