Fixed #23697 -- Improved ForeignObject.get_lookup_constraint() error message.

django/db/models/fields/related.py

@@ -1766,7 +1766,12 @@ class ForeignObject(RelatedField):
         root_constraint = constraint_class()
         assert len(targets) == len(sources)
         if len(lookups) > 1:
-            raise exceptions.FieldError('Relation fields do not support nested lookups')
+            raise exceptions.FieldError(
+                "Cannot resolve keyword %r into field. Choices are: %s" % (
+                    lookups[0],
+                    ", ".join(f.name for f in self.model._meta.get_fields()),
+                )
+            )
         lookup_type = lookups[0]
 
         def get_normalized_value(value):

tests/queries/tests.py

@@ -1164,6 +1164,15 @@ class Queries1Tests(BaseQuerysetTest):
             ['<Author: a1>', '<Author: a2>', '<Author: a3>', '<Author: a4>']
         )
 
+    def test_lookup_constraint_fielderror(self):
+        msg = (
+            "Cannot resolve keyword 'unknown_field' into field. Choices are: "
+            "annotation, category, category_id, children, id, item, "
+            "managedmodel, name, parent, parent_id"
+        )
+        with self.assertRaisesMessage(FieldError, msg):
+            Tag.objects.filter(unknown_field__name='generic')
+
 
 class Queries2Tests(TestCase):
     @classmethod