Support for custom scalar types about graphql-tools

[helfer]

You can already do custom scalar types. If you define scalar MyType in the schema, and then write this in the resolvers:

{
  MyType: {
    __parseLiteral(val){ ... },
    __serialize(val){ ... },
    // etc.
  }
}

Notice the two underscores __ in front of parseLiteral etc.

I've implemented a JSON type in shorthand this way for myself, so I'm sure it works.

Let me know if that doesn't fit your needs.

[WickyNilliams]

Sorry to jump on, but for me this doesn't work...

I am using mockServer and passing my resolvers in. I have a resolver for a custom Date scalar like so (ignoring the impl of it for now):

  Date: {
    __parseValue(value) {
      return value;
    },
    __serialize(value) {
      return value;
    },
    __parseLiteral(ast) {
      return ast.value;
    }
  }

But then I get the error:

Error: mockFunctionMap[Date] must be a function

If i make it a function I get the error:

Error: GraphQL error: Expected a value of type "Date" but received: [object Object]

[athibaud]

@helfer awesome! that definitely fits my needs :)

large up for this whole apollo project, it's a real pleasure to use. 🙏

[seeden]

@helfer can you add your JSON example?

[helfer]

@seeden see here: http://dev.apollodata.com/tools/graphql-tools/scalars.html