Graphene-django: returning error

[hyusetiawan]

is there a best practice on how to return an error (validation for mutation or otherwise) I have been trying the various workarounds suggested in the issues section to no avail :(

I am hoping for something as simple returning status_code=400 for bad request and a list of errors to the front end

[0nkery]

I made it subclassing GraphQLView and overriding format_error method.

Something like

class CustomGraphQLView(GraphQLView):

    @staticmethod
    def format_error(error):
        if hasattr(error, 'original_error') and error.original_error:
            formatted = {"message": str(error.original_error)}
            if isinstance(error.original_error, UnauthorizedError):
                formatted['code'] = "401"
            elif isinstance(error.original_error, PermissionDeniedError):
                formatted['code'] = "403"
            return formatted

        return GraphQLView.format_error(error)

PermissonDeniedError and UnauthorizedError are custom exceptions in our project.

It works only for single error though.

[spockNinja]

As far as I know, any uncaught Exception raised during query validation or execution will cause the graphql response to return 400, and the Exception will be coerced into a str and put in the errors key like "errors": [{"message": "Exception as string"}].

Is there something more specific you need, or is that not working as expected in some cases?

[leiserfg]

For auth errors is better to return 401 and 403

[phalt]

The small plugin graphene-django-sentry has an example where it captures errors before returning, I'd suggest looking at that and adapting it for your needs.