Fixed #33592 -- Fixed "View on Site" links in custom admin site.

django/contrib/admin/options.py

@@ -347,6 +347,7 @@ class BaseModelAdmin(metaclass=forms.MediaDefiningClass):
                     "content_type_id": get_content_type_for_model(obj).pk,
                     "object_id": obj.pk,
                 },
+                current_app=self.admin_site.name,
             )
 
     def get_empty_value_display(self):

tests/admin_views/tests.py

@@ -7930,6 +7930,21 @@ class AdminViewOnSiteTests(TestCase):
         model_admin = ModelAdmin(Worker, None)
         self.assertIsNone(model_admin.get_view_on_site_url(Worker()))
 
+    def test_custom_admin_site(self):
+        model_admin = ModelAdmin(City, customadmin.site)
+        content_type_pk = ContentType.objects.get_for_model(City).pk
+        redirect_url = model_admin.get_view_on_site_url(self.c1)
+        self.assertEqual(
+            redirect_url,
+            reverse(
+                f"{customadmin.site.name}:view_on_site",
+                kwargs={
+                    "content_type_id": content_type_pk,
+                    "object_id": self.c1.pk,
+                },
+            ),
+        )
+
 
 @override_settings(ROOT_URLCONF="admin_views.urls")
 class InlineAdminViewOnSiteTest(TestCase):