1 files changed, 14 insertions, 0 deletions
diff --git a/django/contrib/contenttypes/fields.py b/django/contrib/contenttypes/fields.py
index a3e87f6ed4..4905fd1fff 100644
--- a/django/contrib/contenttypes/fields.py
+++ b/django/contrib/contenttypes/fields.py
@@ -402,6 +402,20 @@ class GenericRelation(ForeignObject):
             )
         ]
 
+    def get_local_related_value(self, instance):
+        return self.get_instance_value_for_fields(instance, self.foreign_related_fields)
+
+    def get_foreign_related_value(self, instance):
+        # We (possibly) need to convert object IDs to the type of the
+        # instances' PK in order to match up instances during prefetching.
+        return tuple(
+            foreign_field.to_python(val)
+            for foreign_field, val in zip(
+                self.foreign_related_fields,
+                self.get_instance_value_for_fields(instance, self.local_related_fields),
+            )
+        )
+
     def _get_path_info_with_parent(self, filtered_relation):
         """
         Return the path that joins the current model through any parent models.