Error Status Code Mapper

error_status_code_mapper

Maps framework error types to HTTP-like status codes.

ErrorStatusCodeMapper

Assigns status codes to ErrorMessageModel entries based on
the error type.

Default mapping

• ValidationError → 400
• RuleViolationError → 409
• CombinedErrors/group → 422
• anything else → 500

Source code in src/forging_blocks/presentation/error_status_code_mapper.py

class ErrorStatusCodeMapper:
    """Assigns status codes to ``ErrorMessageModel`` entries based on
    the error type.

    Default mapping:
        - ``ValidationError``        → 400
        - ``RuleViolationError``     → 409
        - ``CombinedErrors``/group   → 422
        - anything else              → 500
    """

    def map(self, view_model: ErrorViewModel) -> ErrorViewModel:
        """Return a new ``ErrorViewModel`` with ``status_code`` set on
        every message.

        Args:
            view_model: The view model produced by
                ``ErrorPresenter.to_view_model``.

        Returns:
            A new ``ErrorViewModel`` whose ``ErrorMessageModel``
            entries each carry the appropriate ``status_code``.
        """
        enriched: list[ErrorMessageModel] = [
            replace(msg, status_code=self._status_code_for(msg.code)) for msg in view_model.messages
        ]
        return ErrorViewModel(messages=enriched)

    def _status_code_for(self, code: str | None) -> int:
        if code is None:
            return 500
        status_map: dict[str, int] = {
            "ValidationError": 400,
            "ValidationFieldErrors": 400,
            "CombinedValidationErrors": 400,
            "RuleViolationError": 409,
            "CombinedRuleViolationErrors": 409,
            "CombinedErrors": 422,
            "FieldErrors": 422,
        }
        return status_map.get(code, 500)

map(view_model: ErrorViewModel) -> ErrorViewModel

Return a new ErrorViewModel with status_code set on
every message.

Parameters:

Name	Type	Description	Default
view_model	ErrorViewModel	The view model produced by ErrorPresenter.to_view_model.	required

Returns:

Type	Description
ErrorViewModel	A new ErrorViewModel whose ErrorMessageModel
ErrorViewModel	entries each carry the appropriate status_code.

Source code in src/forging_blocks/presentation/error_status_code_mapper.py

def map(self, view_model: ErrorViewModel) -> ErrorViewModel:
    """Return a new ``ErrorViewModel`` with ``status_code`` set on
    every message.

    Args:
        view_model: The view model produced by
            ``ErrorPresenter.to_view_model``.

    Returns:
        A new ``ErrorViewModel`` whose ``ErrorMessageModel``
        entries each carry the appropriate ``status_code``.
    """
    enriched: list[ErrorMessageModel] = [
        replace(msg, status_code=self._status_code_for(msg.code)) for msg in view_model.messages
    ]
    return ErrorViewModel(messages=enriched)