Node.js -如何使用graphql获取关联的模型数据？

npm install express express-graphql graphql

const { GraphQLObjectType, GraphQLString, GraphQLSchema } = require('graphql');

// 定义数据类型
const UserType = new GraphQLObjectType({
  name: 'User',
  fields: () => ({
    id: { type: GraphQLString },
    name: { type: GraphQLString },
    email: { type: GraphQLString },
    // 其他字段...
  })
});

// 定义根查询类型
const RootQuery = new GraphQLObjectType({
  name: 'RootQueryType',
  fields: {
    user: {
      type: UserType,
      args: {
        id: { type: GraphQLString }
      },
      resolve(parent, args) {
        // 从数据库或其他数据源获取用户数据
        // 根据args.id获取关联的模型数据
        // 返回关联的模型数据
      }
    }
  }
});

module.exports = new GraphQLSchema({
  query: RootQuery
});

const express = require('express');
const { graphqlHTTP } = require('express-graphql');
const schema = require('./schema');

const app = express();

app.use('/graphql', graphqlHTTP({
  schema,
  graphiql: true // 启用GraphQL的可视化调试界面
}));

app.listen(3000, () => {
  console.log('GraphQL server running on port 3000');
});

node server.js

query {
  user(id: "1") {
    id
    name
    email
    # 其他字段...
  }
}