Change default form for field in django

Question

I'm programming an application in Django and I have a ManyToManyField in my model, this relates a User model with Event model, but when I enter in django admin, the default form for ManyToManyField show all User registered in mi DB, I can't select the user that I want select.

¿ How I can change the default form in the admin site for a select form ?

This is what i have:

and I want something like this:

Thanks :)

Answer 1

You should use filter_horizontal in your Admin class for this model.

That would be something like:

class EventAdmin(admin.ModelAdmin):
  filter_horizontal = ('participantes',)