Fixed #373 -- Added CompositePrimaryKey.

Thanks Lily Foote and Simon Charette for reviews and mentoring
this Google Summer of Code 2024 project.

Co-authored-by: Simon Charette <charette.s@gmail.com>
Co-authored-by: Lily Foote <code@lilyf.org>

2 files changed, 15 insertions, 1 deletions

diff --git a/tests/admin_registration/models.py b/tests/admin_registration/models.py
index 0ae9251133..2231c236de 100644
--- a/tests/admin_registration/models.py
+++ b/tests/admin_registration/models.py
@@ -20,3 +20,9 @@ class Location(models.Model):
 
 class Place(Location):
     name = models.CharField(max_length=200)
+
+
+class Guest(models.Model):
+    pk = models.CompositePrimaryKey("traveler", "place")
+    traveler = models.ForeignKey(Traveler, on_delete=models.CASCADE)
+    place = models.ForeignKey(Place, on_delete=models.CASCADE)
diff --git a/tests/admin_registration/tests.py b/tests/admin_registration/tests.py
index 3b0e656f5f..0a881caf65 100644
--- a/tests/admin_registration/tests.py
+++ b/tests/admin_registration/tests.py
@@ -5,7 +5,7 @@ from django.contrib.admin.sites import site
 from django.core.exceptions import ImproperlyConfigured
 from django.test import SimpleTestCase
 
-from .models import Location, Person, Place, Traveler
+from .models import Guest, Location, Person, Place, Traveler
 
 
 class NameAdmin(admin.ModelAdmin):
@@ -92,6 +92,14 @@ class TestRegistration(SimpleTestCase):
         with self.assertRaisesMessage(ImproperlyConfigured, msg):
             self.site.register(Location)
 
+    def test_composite_pk_model(self):
+        msg = (
+            "The model Guest has a composite primary key, so it cannot be registered "
+            "with admin."
+        )
+        with self.assertRaisesMessage(ImproperlyConfigured, msg):
+            self.site.register(Guest)
+
     def test_is_registered_model(self):
         "Checks for registered models should return true."
         self.site.register(Person)