GraphQL入门之变更输入类型

鍓嶄竴绡囨枃绔犱粙缁嶄簡鍙樻洿鎿嶄綔锛屽湪鍒涘缓 User 瀵硅薄鐨勬椂鍊欙紝鍙紶閫掍簡 name 鍜?email 鍙傛暟锛屼絾鏄鏋滃睘鎬уお澶氭垨鑰呭垱寤哄璞＄殑鏃跺€欏彧闇€瑕侀儴鍒嗗繀閫夊弬鏁帮紝鐩存帴鎶婂睘鎬ч兘褰撴垚鍙傛暟灏变笉鍚堥€備簡锛岃繖閲?GraphQL 鎻愪緵浜?Input Type 鍙傛暟鏉ヨВ鍐宠繖涓棶棰樸€備笅闈㈢湅涓緥瀛愩€?/p>

鍒涘缓 Node.js 鐨勫伐绋?/h2>

mkdir myapp
cd myapp
npm init (涓€璺洖杞?

瀹夎渚濊禆鍖?/h2>

npm install @apollo/server graphql

瀹氫箟 Schema

鍒涘缓 schema.graphql 鏂囦欢锛屽唴瀹瑰涓嬶細

type User {
    id: ID!
    name: String!
    email: String!
}

type Query {
    users: [User],
}

input UserInput {
  name: String!
  email: String!
}

type Mutation {
  createUser(user: UserInput!) : User!
}

schema {
  query: Query
  mutation: Mutation
}

schema 鏂囦欢涓昏鍖呮嫭锛?/p>

1. 鏂板浜嗚緭鍏ュ弬鏁?UserInput 鐨勫畾涔夛紝浣滀负婕旂ず鍙寘鍚袱涓弬鏁?name 鍜?email銆?/li>
2. 淇敼鍙樻洿鎿嶄綔涓嶅啀浣跨敤 name 鍜?email 浣滀负鍙傛暟锛岃€屾槸鏀规垚浣跨敤杈撳叆鍙傛暟 UserInput銆?/li>

瀹炵幇澶勭悊鍣?/h2>

鍒涘缓 resolvers.js 鏂囦欢锛屽唴瀹瑰涓嬶細

const user1 = {id: 1, name: 'user1', email: 'user1@gmail.com'};
const user2 = {id: 2, name: 'user2', email: 'user2@gmail.com'};
const user3 = {id: 3, name: 'user3', email: 'user3@gmail.com'};
const users = [user1, user2, user3];

const resolvers = {
  Query: {
    users: () => users,
  },

  Mutation: {
    createUser(obj, args, context, info) {
      let user = {id: users.length + 1,name: args.user.name, email: args.user.email};
      users.push(user);
      return user;
    }
  }
};

module.exports = resolvers;

澶勭悊鍣ㄥ嚱鏁版湁浜涘彉鍖栵紝涓昏灏辨槸 args 閲屼笉鐩存帴浣跨敤 name 鍜?email 灞炴€э紝鑰屾槸閫氳繃 args 涓殑 user 瀵硅薄鏉ラ棿鎺ヤ娇鐢ㄣ€?/p>

涓荤▼搴?/h2>

鍒涘缓 server.js 鏂囦欢锛屽唴瀹瑰涓嬶細

const { ApolloServer } =  require('@apollo/server');
const { startStandaloneServer } = require('@apollo/server/standalone');
const fs = require("fs");

const typeDefs = fs.readFileSync('./schema.graphql').toString();
const resolvers = require('./resolvers');

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

startStandaloneServer(server).then(function(data) {
  console.log(`馃殌 Server ready at ${data.url}`);
});

娴嬭瘯

鍚姩鏈嶅姟

node server.js

鏈嶅姟鍚姩鍚庯紝璁块棶 http://localhost:4000 杩涜娴嬭瘯銆?/p>

鍙樻洿鎿嶄綔

鍙樻洿璇锋眰

mutation createUser($user: UserInput!) {
  createUser(user: $user) {
    id,
    name,
    email
  }
}

鍙樻洿鍙傛暟

{
  "user": {
    "name": "newuser",
    "email": "newuser@gmail.com"
  }
}

鎿嶄綔缁撴灉

{
  "data": {
    "createUser": {
      "id": "4",
      "name": "newuser",
      "email": "newuser@gmail.com"
    }
  }
}