{"action":"created","comment":{"url":"https://api.github.com/repos/edx/edx-platform/pulls/comments/41383721","id":41383721,"diff_hunk":"@@ -143,15 +143,15 @@ def override_field_for_ccx(ccx, block, name, value):\n \n     if not override:\n         try:\n-            override = CcxFieldOverride.objects.create(\n-                ccx=ccx,\n-                location=block.location,\n-                field=name,\n-                value=serialized_value\n-            )\n-            _get_overrides_for_ccx(ccx).setdefault(block.location, {})[name + \"_id\"] = override.id\n+            with transaction.atomic():\n+                override = CcxFieldOverride.objects.create(\n+                    ccx=ccx,\n+                    location=block.location,\n+                    field=name,\n+                    value=serialized_value\n+                )\n+                _get_overrides_for_ccx(ccx).setdefault(block.location, {})[name + \"_id\"] = override.id\n         except IntegrityError:\n-         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