
from rest_framework import status
from rest_framework.exceptions import APIException


def json_api_exception_handler(exc, context):
    """ Custom exception handler that returns errors object as an array """

    # Import inside method to avoid errors when the OSF is loaded without Django
    from rest_framework.views import exception_handler
    response = exception_handler(exc, context)

    # Error objects may have the following members. Title removed to avoid clash with node "title" errors.
    top_level_error_keys = ['id', 'links', 'status', 'code', 'detail', 'source', 'meta']
    errors = []

    if response:
        message = response.data
        if isinstance(message, dict):
            for key, value in message.iteritems():
                if key in top_level_error_keys:
                    errors.append({key: value})
                else:
                    if isinstance(value, list):
                        for reason in value:
                            errors.append({'source': {key: reason}})
                    else:
                        errors.append({'source': {key: value}})
        elif isinstance(message, (list, tuple)):
            for error in message:
                errors.append({'detail': error})
        else:
            errors.append({'detail': message})

        response.data = {'errors': errors}

    return response


# Custom Exceptions the Django Rest Framework does not support
class Gone(APIException):
    status_code = status.HTTP_410_GONE
    default_detail = ('The requested resource is no longer available.')


from rest_framework import status
from rest_framework.exceptions import APIException


def json_api_exception_handler(exc, context):
    """ Custom exception handler that returns errors object as an array """

    # Import inside method to avoid errors when the OSF is loaded without Django
    from rest_framework.views import exception_handler
    response = exception_handler(exc, context)

    # Error objects may have the following members. Title removed to avoid clash with node "title" errors.
    top_level_error_keys = ['id', 'links', 'status', 'code', 'detail', 'source', 'meta']
    errors = []

    if response:
        message = response.data
        if isinstance(message, dict):
            for key, value in message.iteritems():
                if key in top_level_error_keys:
                    errors.append({key: value})
                else:
                    if isinstance(value, list):
                        for reason in value:
                            errors.append({'source': {'pointer': '/data/attributes/' + key}, 'detail': reason})
                    else:
                        errors.append({'source': {'pointer': '/data/attributes/' + key}, 'detail': value})
        elif isinstance(message, (list, tuple)):
            for error in message:
                errors.append({'detail': error})
        else:
            errors.append({'detail': message})

        response.data = {'errors': errors}

    return response


# Custom Exceptions the Django Rest Framework does not support
class Gone(APIException):
    status_code = status.HTTP_410_GONE
    default_detail = ('The requested resource is no longer available.')

Change source to point to which part of the request caused the error, and add the specific reason to detail
Change source to point to which part of the request caused the error, and add the specific reason to detail
