Custom Exception Handler

Is your feature request related to a problem? Please describe. Thanks for the great package. Now I want to response the error based on some custom exceptions I threw.

Describe the solution you’d like It should expose the default spec-compliant formatError function as: https://github.com/graphql/graphql-js/blob/master/src/error/formatError.js Then it should allow to pass a custom formatError function to handle the error in the schema constructor.

[namnm]

Yes, your idea has basically covered the case. And I think we need to expose the default error handler too.

public class MyExceptionHandler
{
    public QueryError HandleException(ExceptionContext ctx)
    {
        // We need to expose the default exception handler function as a static helper or something
        // So we can get the default QueryError and modify it instead of manually craft a new one
        var res = DefaultExceptionHandler.HandleException(ctx);
        // In this default QueryError it already has the context info such as path, line number...
        // We only want to modify the error message though
        // TODO modify res here based on the exception
        //
        return res;
    }
}

[michaelstaib]

#319