[1.7.x] Fixed #23754 -- Always allowed reference to the primary key in the admin

This change allows dynamically created inlines "Add related" button to work
correcly as long as their associated foreign key is pointing to the primary
key of the related model.

Thanks to amorce for the report, Julien Phalip for the initial patch,
and Collin Anderson for the review.

Backport of f9c4e14aeca7df79991bca8ac2d743953cbd095c from master

1 files changed, 10 insertions, 6 deletions

diff --git a/tests/admin_views/tests.py b/tests/admin_views/tests.py
index 2c7db8bd6b..50d68df2a2 100644
--- a/tests/admin_views/tests.py
+++ b/tests/admin_views/tests.py
@@ -613,26 +613,30 @@ class AdminViewBasicTest(AdminViewBasicTestCase):
             self.assertEqual(response.status_code, 400)
             self.assertEqual(len(calls), 1)
 
-        # Specifying a field referenced by another model should be allowed.
-        response = self.client.get("/test_admin/admin/admin_views/section/", {TO_FIELD_VAR: 'id'})
+        # #23839 - Primary key should always be allowed, even if the referenced model isn't registered.
+        response = self.client.get("/test_admin/admin/admin_views/notreferenced/", {TO_FIELD_VAR: 'id'})
         self.assertEqual(response.status_code, 200)
 
         # Specifying a field referenced by another model though a m2m should be allowed.
-        response = self.client.get("/test_admin/admin/admin_views/m2mreference/", {TO_FIELD_VAR: 'id'})
+        # XXX: We're not testing against a non-primary key field since the admin doesn't
+        # support it yet, ref #23862
+        response = self.client.get("/test_admin/admin/admin_views/recipe/", {TO_FIELD_VAR: 'id'})
         self.assertEqual(response.status_code, 200)
 
-        # #23604 - Specifying the pk of this model should be allowed when this model defines a m2m relationship
+        # #23604 - Specifying a field referenced through a reverse m2m relationship should be allowed.
+        # XXX: We're not testing against a non-primary key field since the admin doesn't
+        # support it yet, ref #23862
         response = self.client.get("/test_admin/admin/admin_views/ingredient/", {TO_FIELD_VAR: 'id'})
         self.assertEqual(response.status_code, 200)
 
         # #23329 - Specifying a field that is not referred by any other model directly registered
         # to this admin site but registered through inheritance should be allowed.
-        response = self.client.get("/test_admin/admin/admin_views/referencedbyparent/", {TO_FIELD_VAR: 'id'})
+        response = self.client.get("/test_admin/admin/admin_views/referencedbyparent/", {TO_FIELD_VAR: 'name'})
         self.assertEqual(response.status_code, 200)
 
         # #23431 - Specifying a field that is only referred to by a inline of a registered
         # model should be allowed.
-        response = self.client.get("/test_admin/admin/admin_views/referencedbyinline/", {TO_FIELD_VAR: 'id'})
+        response = self.client.get("/test_admin/admin/admin_views/referencedbyinline/", {TO_FIELD_VAR: 'name'})
         self.assertEqual(response.status_code, 200)
 
         # We also want to prevent the add and change view from leaking a