[Django]-Django Admin filter on Foreign Key property

See https://code.djangoproject.com/ticket/3400 . It works ok in django 1.3 🙂

class Room(models.Model):
    house = models.ForeignKey(House)

    def __unicode__(self):
        return self.house.town.name

class Booking(models.Model):
    room = models.ForeignKey(Room)

    def __unicode__(self):
        return self.room.house.town.name

class BookingOpts(admin.ModelAdmin):
    list_filter = ('room__house__town',)
    raw_id_admin = ('room', )

admin.site.register(Town)
admin.site.register(House)
admin.site.register(Room)
admin.site.register(Booking, BookingOpts)

I have found and tested following solution:

http://www.djangosnippets.org/snippets/1911/

It works with ForeignKeys, but it doesn’t work with ManyToMany relations.

I ran into the same problem and really needed a solution. I have a workaround that lets you create a filter on a FK related model property. You can even traverse more than one FK relationship. It creates a new FilterSpec subclass that subclasses the default RelatedFilterSpec used to give you a filter on a ForeignKey field.

See http://djangosnippets.org/snippets/2260/