In Django, how to properly access through a proxy model to related proxy models

Question

Hello, I wanted to override the get_absolute_url method in the Django User and Group models from the auth app.

My first idea was to define a proxy model, but then I noticed that the elements in usuario.groups were instances of Group instead of Grupo and it also happened the same in the grupo.user_set case. So I expanded the proxy models a bit

class Usuario(User):
    class Meta:
        proxy = True

    @models.permalink
    def get_absolute_url(self):
        return ('ver_usuario', [self.id])

    @property
    def grupos(self):
        return Grupo.objects.filter(user=self.pk)

    @grupos.setter
    def grupos(self, valor):
        self.groups = valor


class Grupo(Group):
    class Meta:
        proxy = True

    @models.permalink
    def get_absolute_url(self):
        return ('ver_grupo', [self.id])

    @property
    def usuarios(self):
        return Usuario.objects.filter(groups=self.pk)

    @usuarios.setter
    def usuarios(self, valor):
        self.user_set = valor

But then I saw that the RelatedManager methods grupo.usuarios.create(username='test_usuario') will create the user but it won't associate it with the group and this happens because grupo.user_set is a ManyRelatedManager and grupo.usuarios is a QuerySet. So maybe creating a special ManyRelatedManager... but at this point I feel that this is growing unnecesarilly complex.

Since I want to replace get_absolute_url I'll just use the url tag in the templates. But I wonder, if I wanted to add other methods, how should I do it?

Answer 1

You can override get_absolute_url on a per installation basis by using the ABSOLUTE_URL_OVERIDES setting.