Skip FieldInfo merging when unnecessary (#6862)

pydantic · Jul 25, 2023 · d9d4750 · d9d4750
1 parent 3284a24
commit d9d4750
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/pydantic/fields.py b/pydantic/fields.py
@@ -380,6 +380,14 @@ def merge_field_infos(*field_infos: FieldInfo, **overrides: Any) -> FieldInfo:
             flattened_field_infos.extend(x for x in field_info.metadata if isinstance(x, FieldInfo))
             flattened_field_infos.append(field_info)
         field_infos = tuple(flattened_field_infos)
+        if len(field_infos) == 1:
+            # No merging necessary, but we still need to make a copy and apply the overrides
+            field_info = copy(field_infos[0])
+            field_info._attributes_set.update(overrides)
+            for k, v in overrides.items():
+                setattr(field_info, k, v)
+            return field_info
+
         new_kwargs: dict[str, Any] = {}
         metadata = {}
         for field_info in field_infos: