Django - How to get admin url from model instance

django, django-admin, django-models, python

Solution

This Django snippet should do:

from django.urls import reverse
from django.contrib.contenttypes.models import ContentType
from django.db import models

class MyModel(models.Model):

    def get_admin_url(self):
        content_type = ContentType.objects.get_for_model(self.__class__)
        return reverse("admin:%s_%s_change" % (content_type.app_label, content_type.model), args=(self.id,))

The `self` refers to the parent model class, i.e. `self.id` refers to the object's instance `id`. You can also set it as a `property` on the model by sticking the `@property` decorator on top of the method signature.

EDIT: The answer by Chris Pratt below saves a DB query over the `ContentType` table. My answer still "works", and is less dependent on the Django model `instance._meta` internals. FYI.

Problem

I'm trying to send an email to a user when a new model instance is saved and I want the email to include a link to the admin page for that model instance. Is there a way to get the correct URL? I figure Django must have that information stored somewhere.

Original source