♻️ Refactor ModelField.required, use FieldInfo internals

fastapi/_compat/v2.py

@@ -102,10 +102,6 @@ class ModelField:
         sa = self.field_info.serialization_alias
         return sa or None
 
-    @property
-    def required(self) -> bool:
-        return self.field_info.is_required()
-
     @property
     def default(self) -> Any:
         return self.get_default()

fastapi/dependencies/utils.py

@@ -710,7 +710,7 @@ def _validate_value_with_model_field(
     *, field: ModelField, value: Any, values: dict[str, Any], loc: tuple[str, ...]
 ) -> tuple[Any, list[Any]]:
     if value is None:
-        if field.required:
+        if field.field_info.is_required():
             return None, [get_missing_field_error(loc=loc)]
         else:
             return deepcopy(field.default), []
@@ -742,7 +742,7 @@ def _get_multidict_value(
         )
         or (is_sequence_field(field) and len(value) == 0)
     ):
-        if field.required:
+        if field.field_info.is_required():
             return
         else:
             return deepcopy(field.default)
@@ -996,7 +996,9 @@ def get_body_field(
     BodyModel = create_body_model(
         fields=flat_dependant.body_params, model_name=model_name
     )
-    required = any(True for f in flat_dependant.body_params if f.required)
+    required = any(
+        True for f in flat_dependant.body_params if f.field_info.is_required()
+    )
     BodyFieldInfo_kwargs: dict[str, Any] = {
         "annotation": BodyModel,
         "alias": "body",

fastapi/openapi/utils.py

@@ -161,7 +161,7 @@ def _get_openapi_operation_parameters(
             parameter = {
                 "name": name,
                 "in": param_type.value,
-                "required": param.required,
+                "required": param.field_info.is_required(),
                 "schema": param_schema,
             }
             if field_info.description:
@@ -198,7 +198,7 @@ def get_openapi_operation_request_body(
     )
     field_info = cast(Body, body_field.field_info)
     request_media_type = field_info.media_type
-    required = body_field.required
+    required = body_field.field_info.is_required()
     request_body_oai: dict[str, Any] = {}
     if required:
         request_body_oai["required"] = required