Graphql-yoga: How to get nested fields arguments?

[asci]

Hello,
I have a small and possible simple question about access to nested field arguments
Types:

  type NestedField  {
    value: String!
  }
  type Example {
    nestedField(arg: Int!): NestedField
  }

  type Query {
    getExample: Example!
  }

Query:

{
  getExample {
    nestedField(arg: 1) {
      value
    }
  }
}

Resolvers:

const resolvers = {
  Query: {
    getExample(_, args) {
      console.log('============================================');
      console.log(JSON.stringify(args, null, 2));
      return {
        nestedField: {
          value: 'test'
        }
      };
    }
  }
};

In args I have an empty object, but I checked query itself contains data about an argument. How can I get access to it in my resolver? Thanks!

[schickling]

Even though you seem to have found the answer yourself, it would be great if you could provide your solution to other people who might find this issue.

[asci]

Yep, sure, solution, as I expected is easy. Instead of returning value for the nested field, we need to return a function that will return a value. And in this function will be an argument for the nested field:

const resolvers = {
  Query: {
    getExample(_, args) {
      console.log('============================================');
      console.log(JSON.stringify(args, null, 2));
      return {
        nestedField({ arg }) {
          return {value: `test${arg}`}
        }
      };
    }
  }
};

[craigspaeth]

This example doesn't seem to work, with the following...

````javascript
import { GraphQLServer } from 'graphql-yoga'

const typeDefs = type NestedField { value: String! } type Example { nestedField(arg: Int!): NestedField } type Query { getExample: Example! }

const resolvers = {
Query: {
getExample(_, args) {
console.log('============================================');
console.log(JSON.stringify(args, null, 2));
return {
nestedField({ arg }) {
return {value: test${arg}}
}
};
}
}
};

const server = new GraphQLServer({ typeDefs, resolvers })
server.start(() => console.log('Server is running on localhost:4000'))
````

I get Error: Cannot return null for non-nullable field NestedField.value.. I can't seem to get sub-resolvers to work at all with GraphQL Yoga.