Question

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.

Answer 1

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.