Refs #24121 -- Added __repr__() to ChangeList and BaseStorage.

django/contrib/admin/views/main.py

@@ -108,6 +108,13 @@ class ChangeList:
         self.title = title % self.opts.verbose_name
         self.pk_attname = self.lookup_opts.pk.attname
 
+    def __repr__(self):
+        return '<%s: model=%s model_admin=%s>' % (
+            self.__class__.__qualname__,
+            self.model.__qualname__,
+            self.model_admin.__class__.__qualname__,
+        )
+
     def get_filters_params(self, params=None):
         """
         Return all params except IGNORED_PARAMS.

django/contrib/messages/storage/base.py

@@ -69,6 +69,9 @@ class BaseStorage:
     def __contains__(self, item):
         return item in self._loaded_messages or item in self._queued_messages
 
+    def __repr__(self):
+        return f'<{self.__class__.__qualname__}: request={self.request!r}>'
+
     @property
     def _loaded_messages(self):
         """

tests/admin_changelist/tests.py

@@ -67,6 +67,13 @@ class ChangeListTests(TestCase):
         request.user = user
         return request
 
+    def test_repr(self):
+        m = ChildAdmin(Child, custom_site)
+        request = self.factory.get('/child/')
+        request.user = self.superuser
+        cl = m.get_changelist_instance(request)
+        self.assertEqual(repr(cl), '<ChangeList: model=Child model_admin=ChildAdmin>')
+
     def test_specified_ordering_by_f_expression(self):
         class OrderedByFBandAdmin(admin.ModelAdmin):
             list_display = ['name', 'genres', 'nr_of_members']

tests/messages_tests/base.py

@@ -88,6 +88,14 @@ class BaseTests:
         storage._loaded_data = data or []
         return storage
 
+    def test_repr(self):
+        request = self.get_request()
+        storage = self.storage_class(request)
+        self.assertEqual(
+            repr(storage),
+            f'<{self.storage_class.__qualname__}: request=<HttpRequest>>',
+        )
+
     def test_add(self):
         storage = self.get_storage()
         self.assertFalse(storage.added_new)