express - 如何从 Express 服务器后端调用 GraphQL 查询/变异？

Question

我的前端是 localhost:3000 ，我的 GraphQL 服务器是 localhost:3333 .

我已经使用 react-apollo 在 JSX 领域中查询/变异，但还没有从 Express 进行查询/变异。

我想在我的 server.js 中进行查询/突变.

server.get('/auth/github/callback', (req, res) => {
  // send GraphQL mutation to add new user
});

下面似乎是正确的方向，但我收到 TypeError: ApolloClient is not a constructor :

const express = require('express');
const next = require('next');
const ApolloClient = require('apollo-boost');
const gql = require('graphql-tag');


// setup
const client = new ApolloClient({
  uri: 'http://localhost:3333/graphql'
});
const app = next({dev});
const handle = app.getRequestHandler();

app
  .prepare()
  .then(() => {
    const server = express();

    server.get('/auth/github/callback', (req, res) => {
      // GraphQL mutation
      client.query({
        query: gql`
          mutation ADD_GITHUB_USER {
            signInUpGithub(
              email: "email@address.com"
              githubAccount: "githubusername"
              githubToken: "89qwrui234nf0"
            ) {
              id
              email
              githubToken
              githubAccount
            }
          }
        `,
      })
        .then(data => console.log(data))
        .catch(error => console.error(error));
    });

    server.listen(3333, err => {
      if (err) throw err;
      console.log(`Ready on http://localhost:3333`);
    });
  })
  .catch(ex => {
    console.error(ex.stack);
    process.exit(1);
  });

This post mentions Apollo as the solution ，但不举例。

如何从 Express 服务器调用 GraphQL 突变 :3000到 GraphQL :3333 ?

Answer 1

这更有可能是您要查找的内容:

const { createApolloFetch } = require('apollo-fetch');

const fetch = createApolloFetch({
    uri: 'https://1jzxrj179.lp.gql.zone/graphql',
});

fetch({
    query: '{ posts { title } }',
}).then(res => {
    console.log(res.data);
});

// You can also easily pass variables for dynamic arguments
fetch({
    query: `
        query PostsForAuthor($id: Int!) {
            author(id: $id) {
                firstName
                posts {
                    title
                    votes
                }
            }
        }
    `,
    variables: { id: 1 },
}).then(res => {
    console.log(res.data);
});

摘自这篇文章，可能对其他人也有帮助: https://blog.apollographql.com/4-simple-ways-to-call-a-graphql-api-a6807bcdb355