javascript - "Type RootQueryType must define one or more fields."}

Question

尝试让 GraphQL 与 JavaScript 配合使用。不知道我的错误在哪里。

我的代码

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
});

我正在获取

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

为什么不工作？

Answer 1

你忘记使用箭头函数

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

});