Custom exception handler for Django rest framework

custom_exception.py

def format_code(code_name):
    """Format django error code to Circle Error code"""

    if code_name == 'blank':
        return "BLANK_FIELD"
    elif code_name == 'invalid':
        return "INVALID_DATA"
    elif code_name == 'required':
        return "KEY_ERROR"
    else:
        return "INVALID_DATA"


def find_error_code(response_data):
    """
    A custom function to get error code (i.e: invalid, blank)
        if error in single item dict like : {'name':''}, error response would
        {'name': [ErrorDetail(string='This field may not be blank.', code='blank')]}
    :param response_data: {'accounts': [{},
        {'nominee_info':
        {'name': [ErrorDetail(string='This field may not be blank.', code='blank')]},
        'account_type': [ErrorDetail(string='This field may not be blank.', code='blank')]}]
        }
    :return: ERROR_CODE
    """

    for field, value in response_data.items():
        # if value is a list
        if isinstance(value, list):
            for item in value:
                # if item is ErrorDetail object
                if isinstance(item, ErrorDetail):
                    code = getattr(item, 'code', None)
                    return format_code(code)

                elif isinstance(item, dict):
                    if any(item):
                        # If dictionary is not blank
                        # recursive function call with item data
                        return find_error_code(item)
                    else:
                        # if dictionay is blank, continue to next item
                        continue
        else:
            # call function again, until value is list (or [ErrorDetail obj])
            return find_error_code(value)


def custom_exception_handler(exc, context):
    '''
    Override drf default validation error message response and sends as a list
    :param exc:
    :param context:
    :return: response obj
    '''

    response = exception_handler(exc, context)
    if isinstance(exc.detail, (list, dict)):
        err_code = find_error_code(response.data)
        response.data.clear()
        response.data['error_code'] = err_code
        return response

    else:
        response.data.clear()
        response.data['error_code'] = exc.detail
        return response

"""
# to work with this custome error handler, save this file in your project,
#add this in settings.py 
 REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'clibs.c_exceptions.custom_exception_handler', #location for your file
}
# and add raise_exception=True in is_valid() method
if serializer.is_valid(raise_exception=True):

"""