⚡如何在2分钟内将GraphQL服务器添加到RESTful Express.js API

You can get a lot done in 2 minutes, like microwaving popcorn, sending a text message, eating a cupcake, and hooking up a GraphQL server.

您可以在2分钟内完成很多工作，例如微波炉爆米花，发送短信， 吃蛋糕以及连接GraphQL服务器 。

Yup. If you have an old Express.js RESTful API lying around or you're interested in incrementally adopting GraphQL, we only need 2 minutes to hook it up with a fresh new GraphQL Server.

对。如果您有一个旧的Express.js RESTful API，或者对逐步采用GraphQL感兴趣，我们只需2分钟即可将其与新的GraphQL Server连接起来。

Ready? Set. Go!

准备？组。走！

Let's say that your server looked something like the following.

假设您的服务器如下所示。

import express from 'express';
import { apiRouter } from './router';const app = express();
const port = process.env.PORT || 5000;// Existing routes for our Express.js app
app.use('/api/v1', apiRouter);app.listen(port, () => console.log(`[App]: Listening on port ${port}`))

At the root of your project, npm install apollo-server-express as a dependency.

在项目的根目录下， npm install apollo-server-express npm install为依赖项。

npm install apollo-server-express --save

Go to where your Express app is defined and import ApolloServer and gql from apollo-server-express.

转到定义Express应用程序的位置，然后从apollo-server-express导入ApolloServer和gql 。

import { ApolloServer, gql } from 'apollo-server-express'

Next, create an instance of an ApolloServer with the simplest possible GraphQL type definitions and resolvers.

接下来，使用最简单的 GraphQL 类型定义和解析器创建ApolloServer的实例。

const server = new ApolloServer({typeDefs: gql`type Query {hello: String}`,resolvers: {Query: {hello: () => 'Hello world!',},}
})

Lastly, use ApolloServer's applyMiddleware method to pass in our Express.js server.

最后，使用ApolloServer的applyMiddleware方法传递我们的Express.js服务器。

server.applyMiddleware({ app })

Boom. That's it!

繁荣。而已！

Your code should look something like this.

您的代码应如下所示。

import express from 'express';
import { v1Router } from './api/v1';
import { ApolloServer, gql } from 'apollo-server-express'const app = express();
const port = process.env.PORT || 5000;const server = new ApolloServer({typeDefs: gql`type Query {hello: String}`,resolvers: {Query: {hello: () => 'Hello world!',},}
})server.applyMiddleware({ app })app.use('/api/v1', v1Router);app.listen(port, () => {console.log(`[App]: Listening on port ${port}`)
})

If you navigate to localhost:5000/graphql, you should be able to see your GraphQL schema in the GraphQL playground.

如果导航到localhost:5000/graphql ，则应该能够在GraphQL游乐场中看到GraphQL模式。

Note: If you want to change the URL that the GraphQL endpoint sits at from /graphql to something else, you can pass in a path option to server.applyMiddleware() with the URL you want, like path: '/specialUrl'. Check out the docs for full API usage.

注意：如果要将GraphQL端点所在的URL从/graphql为其他名称，则可以将path选项与所需URL传递给server.applyMiddleware() ，例如path: '/specialUrl' 。查看文档以了解完整的API使用情况。

How simple was that? Is your popcorn finished?

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⚡如何在2分钟内将GraphQL服务器添加到RESTful Express.js API

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