GQL Child Resolver example

child-resolver.js

const { ApolloServer, gql } = require('apollo-server');

// Construct a schema, using GraphQL schema language
const typeDefs = gql`
  type Query {
    hello: String
    order(orderId: String!): Order
  }

  type Order {
    id: String
    created: String 
    updated: String
    eligibility: Boolean
    history: [HistoryRecord]
  }

  type HistoryRecord {
    message: String!
  }
`;

// Provide resolver functions for your schema fields
const resolvers = {
  Query: {
    hello: (root, args, context) => {
      return 'Hello world!';
    },
    order: (_, { orderId }) => {
      return {id: orderId, created: "today", updated: "today"} 
    }
  },
  Order: {
    eligibility: (order) => {
      try {
        // call from order api, but fails
        throw new Error("oh noe");
      } catch(e) {
        return e
      }
    }
  }
};

const server = new ApolloServer({ typeDefs, resolvers });

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`)
});