Question

How does one check to see if a modeladmin exists for a given model?

modeladmins are created by registering a model with the admin.site object. how can one check the site object to see which models have been registered, and with which admin_class?

Answer 1

Interesting question, which provoked me to do a little digging.

Once the admin classes have been registered, they are stored in an attribute of the site object called – not surprisingly – _registry. This is a dictionary of model classes to modeladmin classes – note both the keys and values are classes, not names.

So if you have an admin.py like this:

from django.contrib import admin
from myapp.models import MyModel

class MyModelAdmin(admin.ModelAdmin):
    list_display = ('field1', 'field2')

admin.site.register(MyModel, MyModelAdmin)

then once that has actually been imported – usually by the admin.autodiscover() line in urls.py – admin.site._registry will contain something like this:

{<class 'myapp.models.MyModel'>: 
    <django.contrib.admin.options.ModelAdmin object at 0x10210ba50>}

and you would get the ModelAdmin object for MyModel by using the model itself as the key:

>>> admin.site._registry[MyModel]
<django.contrib.admin.options.ModelAdmin object at 0x10210ba50>