From 61b683e5624302d34bee919e8dc1b09cfe465223 Mon Sep 17 00:00:00 2001
From: JONEMI21 <michael.jones2@kingfisher.com>
Date: Fri, 7 Nov 2025 09:28:03 +0000
Subject: [PATCH] fix for pydantic v1

---
 fastapi/_compat/v1.py         | 14 ++++++--------
 fastapi/dependencies/utils.py |  9 ++++++++-
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/fastapi/_compat/v1.py b/fastapi/_compat/v1.py
index 0efc250c1..1d5c83fa7 100644
--- a/fastapi/_compat/v1.py
+++ b/fastapi/_compat/v1.py
@@ -6,7 +6,6 @@ from typing import (
     Callable,
     Dict,
     List,
-    Mapping,
     Sequence,
     Set,
     Tuple,
@@ -36,9 +35,9 @@ if not PYDANTIC_V2:
     from pydantic.error_wrappers import ErrorWrapper as ErrorWrapper
     from pydantic.errors import MissingError
     from pydantic.fields import (  # type: ignore[attr-defined]
+        MAPPING_LIKE_SHAPES,
         SHAPE_FROZENSET,
         SHAPE_LIST,
-        SHAPE_MAPPING,
         SHAPE_SEQUENCE,
         SHAPE_SET,
         SHAPE_SINGLETON,
@@ -84,9 +83,9 @@ else:
     from pydantic.v1.error_wrappers import ErrorWrapper as ErrorWrapper
     from pydantic.v1.errors import MissingError
     from pydantic.v1.fields import (
+        MAPPING_LIKE_SHAPES,
         SHAPE_FROZENSET,
         SHAPE_LIST,
-        SHAPE_MAPPING,
         SHAPE_SEQUENCE,
         SHAPE_SET,
         SHAPE_SINGLETON,
@@ -147,10 +146,7 @@ sequence_shape_to_type = {
     SHAPE_TUPLE_ELLIPSIS: list,
 }
 
-mapping_shapes = {
-    SHAPE_MAPPING,
-}
-mapping_shapes_to_type = {SHAPE_MAPPING: Mapping}
+mapping_shapes = MAPPING_LIKE_SHAPES
 
 
 @dataclass
@@ -233,7 +229,9 @@ def is_pv1_scalar_sequence_mapping_field(field: ModelField) -> bool:
     ):
         if field.sub_fields is not None:
             for sub_field in field.sub_fields:
-                if not is_scalar_sequence_field(sub_field):
+                if not (
+                    is_scalar_sequence_field(sub_field) or is_scalar_field(sub_field)
+                ):
                     return False
         return True
     return False
diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 5fb603e6a..1aa78c4e2 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -701,6 +701,13 @@ async def solve_dependencies(
     )
 
 
+def _extract_error_locs(errors_):
+    if isinstance(errors_, list):
+        errors_ = may_v1._regenerate_error_with_loc(errors=errors_, loc_prefix=())
+
+    return {err["loc"][2] for err in errors_ if len(err["loc"]) >= 3}
+
+
 def _validate_value_with_model_field(
     *, field: ModelField, value: Any, values: Dict[str, Any], loc: Tuple[str, ...]
 ) -> Tuple[Any, List[Any]]:
@@ -717,7 +724,7 @@ def _validate_value_with_model_field(
         and (is_scalar_sequence_mapping_field(field) or is_scalar_mapping_field(field))
     ):
         # Remove failing keys from the dict and try to re-validate
-        invalid_keys = {err["loc"][2] for err in errors_ if len(err["loc"]) >= 3}
+        invalid_keys = _extract_error_locs(errors_)
         v_, errors_ = field.validate(
             {k: v for k, v in value.items() if k not in invalid_keys},
             values,