Trying to get GraphQL to work with JavaScript. Not sure where my mistake is.

My code

const graphql = require('graphql');
const _ = require('lodash');
const {
  GraphQLObjectType,
  GraphQLString,
  GraphQLInt,
  GraphQLSchema
} = graphql;
const users = [
  { id: "23", firstName: "Bill", age: 20},
  { id: "47", firstName: "Sam", age: 21}
];
const UserType = new GraphQLObjectType({
  name: 'User',
  fields: {
    id: {type: GraphQLString},
    firstName: {type: GraphQLString},
    age:{type: GraphQLInt}
  }
});
const RootQuery = new GraphQLObjectType({
  name: 'RootQueryType',
  fields: {
    user: {
      type: UserType,
      args: { id: { type: GraphQLString } },
      resolve(parentValue, args) {
         return _.find(users, { id: args.id });
      }
    }
  }
});
module.exports = new GraphQLSchema ({
  query: RootQuery
});

I am getting

{ "errors": [ { "message": "Type RootQueryType must define one or more fields." } ] }

Why is it not working?

Trying to get GraphQL to work with JavaScript. Not sure where my mistake is.

My code

const graphql = require('graphql');
const _ = require('lodash');
const {
  GraphQLObjectType,
  GraphQLString,
  GraphQLInt,
  GraphQLSchema
} = graphql;
const users = [
  { id: "23", firstName: "Bill", age: 20},
  { id: "47", firstName: "Sam", age: 21}
];
const UserType = new GraphQLObjectType({
  name: 'User',
  fields: {
    id: {type: GraphQLString},
    firstName: {type: GraphQLString},
    age:{type: GraphQLInt}
  }
});
const RootQuery = new GraphQLObjectType({
  name: 'RootQueryType',
  fields: {
    user: {
      type: UserType,
      args: { id: { type: GraphQLString } },
      resolve(parentValue, args) {
         return _.find(users, { id: args.id });
      }
    }
  }
});
module.exports = new GraphQLSchema ({
  query: RootQuery
});

I am getting

{ "errors": [ { "message": "Type RootQueryType must define one or more fields." } ] }

Why is it not working?

• javascript
• express
• graphql
• graphql-js
• express-graphql

2 Answers 2

you forgot to use an arrow function

const UserType = new GraphQLObjectType({
  name: 'User',
  fields:()=>( {
    id: {type: GraphQLString},
    firstName: {type: GraphQLString},
    age:{type: GraphQLInt}

});

I believe your mistake is simply in your Query. You use the RootQueryType's fields object to make your query endpoints. The fields object in your case only contains one query: user. However you are trying to make a query for User, which is different.

const RootQuery = new GraphQLObjectType({
  name: 'RootQueryType',
  fields: {
    // The items listed here are going to be your root query endpoints.
    // Which in this case is only `user`.
    user: {
      type: UserType,
      args: { id: { type: GraphQLString } },
      resolve(parentValue, args) {
         return _.find(users, { id: args.id });
      }
    }
  }
});

So you need to make your query using user.

Additionally, you need to make sure you are making your query correctly. Basic query syntax for what you are trying to achieve looks like this:

{
  user(id: "23") {
    id
    firstName
    age
  }
}

Let me know if this works for you.

Some documentation on queries:

GraphQL Queries

DevHints - GraphQL