feat: add pydantic's error dict to ValidationException

litestar/_signature/model.py

@@ -61,6 +61,7 @@ class ErrorMessage(TypedDict):
  key: NotRequired[str]
  message: str
  source: NotRequired[Literal["body"] | ParamType]
+ exc: NotRequired[Dict[str, Any]]
 
 
 MSGSPEC_CONSTRAINT_FIELDS = (
@@ -128,12 +129,15 @@ def _create_exception(cls, connection: ASGIConnection, messages: list[ErrorMessa
  return InternalServerException()
 
  @classmethod
- def _build_error_message(cls, keys: Sequence[str], exc_msg: str, connection: ASGIConnection) -> ErrorMessage:
+ def _build_error_message(
+ cls, keys: Sequence[str], exc_msg: str, connection: ASGIConnection, exc: Optional[Dict[str, Any]] = None
+ ) -> ErrorMessage:
  """Build an error message.
 
  Args:
  keys: A list of keys.
  exc_msg: A message.
+ exc: An optional error dict.
  connection: An ASGI connection instance.
 
  Returns:
@@ -142,6 +146,9 @@ def _build_error_message(cls, keys: Sequence[str], exc_msg: str, connection: ASG
 
  message: ErrorMessage = {"message": exc_msg.split(" - ")[0]}
 
+ if exc:
+ message["exc"] = exc
+
  if keys:
  message["key"] = key = ".".join(keys)
  if keys[0].startswith("data"):
@@ -195,7 +202,7 @@ def parse_values_from_connection_kwargs(cls, connection: ASGIConnection, **kwarg
  except ExtendedMsgSpecValidationError as e:
  for exc in e.errors:
  keys = [str(loc) for loc in exc["loc"]]
- message = cls._build_error_message(keys=keys, exc_msg=exc["msg"], connection=connection)
+ message = cls._build_error_message(keys=keys, exc_msg=exc["msg"], connection=connection, exc=exc)
  messages.append(message)
  raise cls._create_exception(messages=messages, connection=connection) from e
  except ValidationError as e:

tests/unit/test_contrib/test_pydantic/test_integration.py

@@ -177,25 +177,80 @@ def test(
  assert data
  if pydantic_version == "v1":
  assert data["extra"] == [
- {"key": "child.val", "message": "value is not a valid integer"},
- {"key": "child.other_val", "message": "value is not a valid integer"},
- {"key": "other_child.val.1", "message": "value is not a valid integer"},
+ {
+ "key": "child.val",
+ "message": "value is not a valid integer",
+ "exc": {
+ "loc": ["child", "val"],
+ "msg": "value is not a valid integer",
+ "type": "type_error.integer",
+ },
+ },
+ {
+ "key": "child.other_val",
+ "message": "value is not a valid integer",
+ "exc": {
+ "loc": ["child", "other_val"],
+ "msg": "value is not a valid integer",
+ "type": "type_error.integer",
+ },
+ },
+ {
+ "key": "other_child.val.1",
+ "message": "value is not a valid integer",
+ "exc": {
+ "loc": ["other_child", "val", 1],
+ "msg": "value is not a valid integer",
+ "type": "type_error.integer",
+ },
+ },
  ]
  else:
- assert data["extra"] == [
+ # removed url from exc as that contains pydantic version specific url
+ expected_extra_dict = [
  {
- "message": "Input should be a valid integer, unable to parse string as an integer",
  "key": "child.val",
+ "message": "Input should be a valid integer, unable to parse string as an integer",
+ "exc": {
+ "type": "int_parsing",
+ "loc": ["child", "val"],
+ "msg": "Input should be a valid integer, unable to parse string as an integer",
+ "input": "a",
+ },
  },
  {
- "message": "Input should be a valid integer, unable to parse string as an integer",
  "key": "child.other_val",
+ "message": "Input should be a valid integer, unable to parse string as an integer",
+ "exc": {
+ "type": "int_parsing",
+ "loc": ["child", "other_val"],
+ "msg": "Input should be a valid integer, unable to parse string as an integer",
+ "input": "b",
+ },
  },
  {
- "message": "Input should be a valid integer, unable to parse string as an integer",
  "key": "other_child.val.1",
+ "message": "Input should be a valid integer, unable to parse string as an integer",
+ "exc": {
+ "type": "int_parsing",
+ "loc": ["other_child", "val", 1],
+ "msg": "Input should be a valid integer, unable to parse string as an integer",
+ "input": "c",
+ },
  },
  ]
+ for data_extra_item, expected_extra_item in zip(data["extra"], expected_extra_dict):
+ # partial assert for key and message
+ assert all(
+ data_extra_item[key] == expected_extra_item[key]
+ for key in list(set(data_extra_item.keys()) - {"exc"})
+ )
+
+ # partial assert for exc without url
+ assert all(
+ data_extra_item["exc"][key] == expected_extra_item["exc"][key]
+ for key in list(set(data_extra_item["exc"].keys()) - {"url"})
+ )
 
 
 class V1ModelWithPrivateFields(pydantic_v1.BaseModel):