apollo/server express，mongoose，resolver chains

本文主要是介绍apollo/server express，mongoose，resolver chains，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

apollo/server Get started with Apollo Server - Apollo GraphQL Docs

mongoose Mongoose 5.0 中文文档

index2.ts

import { ApolloServer } from '@apollo/server';
import { expressMiddleware } from '@apollo/server/express4';
import { ApolloServerPluginDrainHttpServer } from '@apollo/server/plugin/drainHttpServer';
import express from 'express';
import http from 'http';
import cors from 'cors';
import { typeDefs, resolvers } from './index2-schema';
import { users } from "./index2-mongoose";const app = express();const httpServer = http.createServer(app);const server = new ApolloServer<{ token?: String }>({typeDefs,resolvers,plugins: [ApolloServerPluginDrainHttpServer({ httpServer })],
});server.start().then(() => {app.use('/graphql',cors<cors.CorsRequest>(),express.json(),expressMiddleware(server, {context: async ({ req }) => ({token: req.headers.token,msg: "会传递到所有的resolver context参数中",dataSources: { users }}),}),);httpServer.listen(4000, () => {console.log(`🚀 Server ready at http://localhost:4000/graphql`);});
});

index2-schema.ts

import { users } from "./index2-mongoose";export let typeDefs = `#graphql#1type Event {name: String!date: String!location: Location}type Location {name: String!weather: WeatherInfo}type WeatherInfo {temperature: Floatdescription: String}#2type Library {branch: String!books: [Book]}type Book {title: Stringauthor: Author}type Author {name: String!}#3type User{_id: ID!name: String!age: Int!sex: String!}type Query {books: [Book]users: [User]user(id: ID!): UserupcomingEvents: [Event!]!libraries: [Library]Library: Library}
`;export const resolvers = {Query: {books() {return [{ id: '1', title: "t1", },{ id: '2', title: "t2", },]},async users(parent: any, args: any, context: { dataSources: { users: { find: () => any; }; }; }) {let value = await users.find();console.log(await context.dataSources.users.find());return value;},async user(parent: any, { id }: any, context: { dataSources: { users: { findById: (arg0: any) => any; }; }; }) {console.log(await context.dataSources.users.findById(id));const user = await users.findById(id)return user;},upcomingEvents() {return [{name: "01",date: "2024-1-1",location: {name: "sunday",weather: {temperature: 18.5,description: 'cold'}}}];},libraries() {return [{ id: "1", branch: 'downtown' },{ id: "2", branch: 'riverside' },];}},Library: {books(parent: any) {// parent上一步libraries解析的结果console.log('books parent =', parent);let books = [{ id: '1', belongto: "1", title: "t1", },{ id: '2', belongto: "1", title: "t2", },{ id: '3', belongto: "1", title: "t2", },{ id: '4', belongto: "2", title: "t2", },{ id: '5', belongto: "2", title: "t2", },]return books.filter(item => item.belongto === parent.id);}},Book: {author(parent: any, args: any, context: any, info: any) {// 上一步books的解析结果console.log(parent);console.log(context);let authors = [{ id: '1', bid: '1', name: "Tom" },{ id: '2', bid: '2', name: "Sam" },{ id: '3', bid: '3', name: "Jack" },{ id: '4', bid: '4', name: "Lucy" },{ id: '5', bid: '5', name: "David" },]return authors.find(item => item.bid === parent.id);}}
};/*
// 查询案例
query ExampleQuery {books {titleauthor{name}}user(id: "63ca47df3dd42947e4cc021b") {_idnameage}upcomingEvents{name}libraries {branchbooks{titleauthor {name}}}
}
*/

index2-mongoose.ts 

import mongoose, { Mongoose } from 'mongoose';mongoose.set("strictQuery", true);mongoose.connect('mongodb://localhost:27017/test');export var db = mongoose.connection;db.on('error', console.error.bind(console, 'connection error:'));db.once('open', function () {console.log('mongodb connection success!');
});function UserModel(mongoose: Mongoose) {let user = new mongoose.Schema({name: { type: String, required: true },password: { type: String, required: true },age: { type: Number, require: true },sex: { type: String, require: true },phone: { type: String, require: true },email: { type: String, required: true },image: { type: String, default: null },myChannel: { type: String, default: null },describle: { type: String, default: null },subscribeCount: { type: Number, default: 0 },});return mongoose.model("User", user);
}export const users = UserModel(mongoose);

这篇关于apollo/server express，mongoose，resolver chains的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---