在GraphQL中使用Typegoose

npm install @typegoose/typegoose mongoose graphql express express-graphql
npm install @types/express @types/graphql @types/node typescript ts-node

// models/User.ts
import { prop, getModelForClass } from '@typegoose/typegoose';

class User {
  @prop({ required: true })
  public name!: string;

  @prop({ required: true })
  public email!: string;
}

const UserModel = getModelForClass(User);
export { User, UserModel };

// schema.ts
import { buildSchema } from 'graphql';

const schema = buildSchema(`
  type User {
    id: ID!
    name: String!
    email: String!
  }

  type Query {
    getUser(id: ID!): User
    getUsers: [User]
  }

  type Mutation {
    createUser(name: String!, email: String!): User
  }
`);

export { schema };

// resolvers.ts
import { UserModel } from './models/User';

const resolvers = {
  getUser: async ({ id }: { id: string }) => {
    return await UserModel.findById(id);
  },
  getUsers: async () => {
    return await UserModel.find();
  },
  createUser: async ({ name, email }: { name: string, email: string }) => {
    const user = new UserModel({ name, email });
    await user.save();
    return user;
  }
};

export { resolvers };

// server.ts
import express from 'express';
import { graphqlHTTP } from 'express-graphql';
import mongoose from 'mongoose';
import { schema } from './schema';
import { resolvers } from './resolvers';

const app = express();
const PORT = 4000;

// 连接到MongoDB
mongoose.connect('mongodb://localhost:27017/typegoose_graphql', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
}).then(() => {
  console.log('Connected to MongoDB');
}).catch(err => {
  console.error('Failed to connect to MongoDB', err);
});

// 设置GraphQL中间件
app.use('/graphql', graphqlHTTP({
  schema,
  rootValue: resolvers,
  graphiql: true,
}));

app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}/graphql`);
});

ts-node server.ts

query {
  getUsers {
    id
    name
    email
  }
}

mutation {
  createUser(name: "John Doe", email: "john.doe@example.com") {
    id
    name
    email
  }
}

query {
  getUser(id: "USER_ID_HERE") {
    id
    name
    email
  }
}