`serialize` and `parseValue` are not called for input parameter of a customised scalar type

[zhaoyi0113]

I define a schema like this:

const query = new GraphQLObjectType({
    name: 'Query',
    fields: {
      quote: {
        type: queryType,
        args: {
          id: { type: QueryID }
        },
      },
    },
  });
const schema = new GraphQLSchema({
    query,
  });

The QueryID is a customised scalar type.

const QueryID = new GraphQLScalarType({
  name: 'QueryID',
  description: 'query id field',
  serialize(dt) {
    // value sent to the client
    return dt;
  },
  parseLiteral(ast) {
    if (ast.kind === 'IntValue') {
      return Number(ast.value);
    }
    return null;
  },
  parseValue(v) {
    // value from the client
    return v;
  },
});

I found that the serialize and parseValue methods are not called when clients send query to my server. I can see parseLiteral is called correctly.
In most of the document I can find, they use gql to define schema but in my case I am using GraphQLSchema object. Is this the root cause?

[IvanGoncharov]

I found that the serialize and parseValue methods are not called when clients send query to my server. I can see parseLiteral is called correctly.

@zhaoyi0113 Please note serialize will be called only if your return value of QueryID type.
As for parseValue it's called only if you provide a value of QueryID as a query variable.

In most of the document I can find, they use gql to define schema but in my case I am using GraphQLSchema object. Is this the root cause?

Even if you define your schema as SDL string it still will be constructed using GraphQLSchema object so it's perfectly fine to use it directly.