Graphql-dotnet: Possibility to return custom error message

[mahald]

Hi,

It hase become a must have that i can return meaningful errror messages from the graphql api.

AFAIK this is not yet possible.

I thus recommend following new feature:

1. Add a new ExceptionClass Called maybe "GraphQL.CustomException"
2. If this Exception is thrown within a resolver the "Message" of the Exception is displayed
3. This is going to bypass ExposeExceptions as i expect this to be "expected behaivor" and ur custom message may tells u more than anything else.

So i could simply throw a message inside a resolver like:
thrown new GraphQL.CustomException($"insufficent permissions, und need the permission {RequiredPermission}");

and it will be displayed in errors (without Lines)

@joemcbride What do you think of this feature ? Are u gonna accept a pull request for this ?

[mahald]

Note: The example maybe isn't good, as permission are handled outside the resolver. But in my case it would be like:

thrown new GraphQL.CustomException($"insufficent licenses, please buy more licenses in the license menu");

[joemcbride]

You can add custom errors in the ResolveFieldContext. I think this should solve your issue?

context =>
{
  context.Errors.Add(new ExecutionError("Some Error"));
  return null;
}

[joemcbride]

See your previous issue: https://github.com/graphql-dotnet/graphql-dotnet/issues/351

[mahald]

oops, sorry missed that this was implemented. thanks a lot.