Function merge_errors

src/marshmallow/error_store.py:37–71

Deeply merge two error messages. The format of ``errors1`` and ``errors2`` matches the ``message`` parameter of :exc:`marshmallow.exceptions.ValidationError`.

(errors1, errors2)

def merge_errors(errors1, errors2):  # noqa: PLR0911
    """Deeply merge two error messages.

    The format of ``errors1`` and ``errors2`` matches the ``message``
    parameter of :exc:`marshmallow.exceptions.ValidationError`.
    """
    if not errors1:
        return errors2
    if not errors2:
        return errors1
    if isinstance(errors1, list):
        if isinstance(errors2, list):
            errors1.extend(errors2)
            return errors1
        if isinstance(errors2, dict):
            errors2[SCHEMA] = merge_errors(errors1, errors2.get(SCHEMA))
            return errors2
        errors1.append(errors2)
        return errors1
    if isinstance(errors1, dict):
        if isinstance(errors2, dict):
            for key, val in errors2.items():
                if key in errors1:
                    errors1[key] = merge_errors(errors1[key], val)
                else:
                    errors1[key] = val
            return errors1
        errors1[SCHEMA] = merge_errors(errors1.get(SCHEMA), errors2)
        return errors1
    if isinstance(errors2, list):
        return [errors1, *errors2]
    if isinstance(errors2, dict):
        errors2[SCHEMA] = merge_errors(errors1, errors2.get(SCHEMA))
        return errors2
    return [errors1, errors2]