Django Admin: ManytoMany Model filter, the other way

Question

I'm stuck on using django's admin feature.

How do I use admin's list_filter for the pizza from toppingsAdmin?

For example, I have these models,
class Topping(models.Model):
    # ...

class Pizza(models.Model):
    # ...
    toppings = models.ManyToManyField(Topping)


From PizzaAdmin, I can call list_filter = ('toppings',)

But, How do I call pizzas from toppingsAdmin. Seems like list_filter = ('pizzas',) does not work, because it doesn't have it as variable inside the Topping model.

Thank you

Answer 1

Add related_name to your toppings field in Pizza model:

toppings = models.ManyToManyField(Topping, related_name='pizzas')

Now you can use the 'pizzas' in the list_filter