npm install --save @nestjs/mongoose mongoose

–registry=https://registry.npm.taobao.org

MongooseModule.forRoot(‘mongodb://localhost/test')
//后面是MongoDB的位置（根据需要而定）
对应添加相应依赖
import { Module } from ‘@nestjs/common';
import { MongooseModule } from ‘@nestjs/mongoose';

import * as mongoose from 'mongoose'

export const UserSchema = new mongoose.Schema(
  {
    id: Number,
    name: String,
    introduction: String,
    headurl: String,
    bigurl: String,
    username: String,
    password: String,
  },
  { collection: 'musicers', versionKey: false },
)

import { Module } from '@nestjs/common';
import { MongooseModule, getModelToken } from '@nestjs/mongoose';
import { UsersController } from './users.controller';
import { UsersService } from './services/users.service';
import { UserSchema } from './schemas/users.schemas';

@Module({
  imports: [
  //这里添加配置。对应引入模块（注意里面的括号结构别给坑了。这里我卡了半天）
    MongooseModule.forFeature([
      { name: 'User', schema: UserSchema }
    ])
  ],
  controllers: [UsersController],
  providers: [
    UsersService,
   ],
})
export class UsersModule {}

import { Model } from 'mongoose';
import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { User } from '../interface/users.interface';
import { IUserService } from '../interface/user-service.interface';


@Injectable()
export class UsersService implements IUserService {

  constructor(@InjectModel('User') private readonly userModel: Model<User>) {}
  
  private static users:User[] = [ ]

  async findAll():Promise<User[]>{
    //return UsersService.users
    return await this.userModel.find({})
    //( 这里我们测试查找全部 )
  }

}

@Controller('users')
export class UsersController {
  constructor(private readonly userservice: UsersService) { }

@Get('getall')
  // @UseGuards(AuthGuard('jwt'))
  async findAll():Promise<User[]> {
    return await this.userservice.findAll()
  }
}