230525 실전프로젝트3 [Node.js/Nest.js 환경 구축하기 2]

✅오늘학습 Keyword

실전프로젝트를 nest 기반으로 진행하기 위해서 CRUD API 구현중이다.

강의자료: https://www.youtube.com/watch?v=3JminDpCJNE&t=2s

 

• Dto란 무엇이며 왜, 어떻게 쓰이는가?

 

✅오늘 겪은 문제 

1. typeorm 설치, Entity 문제, PostgreSQL 연결

 

2. this.userRepository.createUser is not function에러;

[Nest] 12736 - 2023. 05. 25. 오후 3:43:55 ERROR [ExceptionsHandler] this.userRepository.createUser is not a function TypeError: this.userRepository.createUser is not a function at AuthService.signUp (C:\Users\cryst\OneDrive\바탕 화면\sparta\NODE JS\주특기주차\실전프로젝트\NestJs\src\auth\auth.service.ts:10:32) at AuthController.signUp (C:\Users\cryst\OneDrive\바탕 화면\sparta\NODE JS\주특기주차\실전프로젝트\NestJs\src\auth\auth.controller.ts:11:29) at C:\Users\cryst\OneDrive\바탕 화면\sparta\NODE JS\주특기주차\실전프로젝트\NestJs\node_modules\@nestjs\core\router\router-execution-context.js:38:29 at processTicksAndRejections (node:internal/process/task_queues:95:5) at C:\Users\cryst\OneDrive\바탕 화면\sparta\NODE JS\주특기주차\실전프로젝트\NestJs\node_modules\@nestjs\core\router\router-execution-context.js:46:28 at C:\Users\cryst\OneDrive\바탕 화면\sparta\NODE JS\주특기주차\실전프로젝트\NestJs\node_modules\@nestjs\core\router\router-proxy.js:9:17

 

// import { Module } from '@nestjs/common';
// import { AuthController } from './auth.controller';
// import { AuthService } from './auth.service';
// import { TypeOrmModule } from '@nestjs/typeorm';
// import { UserRepository } from './user.repository';

// @Module({
//   imports: [TypeOrmModule.forFeature([UserRepository])],
//   controllers: [AuthController],
//   providers: [AuthService],
// })
// export class AuthModule {}

 

 

 

 

import { Module } from '@nestjs/common';
import { AuthController } from './auth.controller';
import { AuthService } from './auth.service';
import { TypeOrmModule } from '@nestjs/typeorm';
import { UserRepository } from './user.repository';
import { User } from './user.entity';

@Module({
  imports: [TypeOrmModule.forFeature([User])],
  controllers: [AuthController],
  providers: [AuthService, UserRepository],
})
export class AuthModule {}

 

 

 

✅오늘 알게된 점

 

1. nest.js로 api 만드는 기본 순서를 파악했다. auth 기능으로 예시를 들어보면,

• module 만들기 'nest g module auth'
• controller 만들기 'nest g controller auth --no-spec'
• service 만들기 'nest g service auth --no-spec'
• entity파일(sequelize로 치면 model) 만들기 

import { BaseEntity, Column, Entity, PrimaryGeneratedColumn } from 'typeorm';

@Entity()

export class User extends BaseEntity {

  @PrimaryGeneratedColumn()

  id: number;

  @Column()

  username: string;

  @Column()

  password: string;

}

• repository만들기

import { DataSource, Repository } from 'typeorm';

import { User } from './user.entity';

import { InjectRepository } from '@nestjs/typeorm';

export class UserRepository extends Repository<User> {

  constructor(@InjectRepository(User) private dataSource: DataSource) {

    super(User, dataSource.manager);

  }

}

• 생성된 Repository를 다른 곳에서 사용하기 위해 넣어준다
• auth.module안에 먼저 넣어준다

import { Module } from '@nestjs/common';

import { AuthController } from './auth.controller';

import { AuthService } from './auth.service';

import { TypeOrmModule } from '@nestjs/typeorm';

import { UserRepository } from './user.repository';

@Module({

  imports: [TypeOrmModule.forFeature([UserRepository])],

  controllers: [AuthController],

  providers: [AuthService],

})

export class AuthModule {}

• auth.service에도 넣어준다

import { UserRepository } from './user.repository';

import { Injectable } from '@nestjs/common';

@Injectable()

export class AuthService {

  constructor(private userRepository: UserRepository) {}

}

• auth Dto가 필요하니까 dto파일을 따로 만든 후 repo에 연결시켜준다

import { AuthCredentialsDto } from './dto/auth-credential.dto';

import { DataSource, Repository } from 'typeorm';

import { User } from './user.entity';

import { InjectRepository } from '@nestjs/typeorm';

export class UserRepository extends Repository<User> {

  constructor(@InjectRepository(User) private dataSource: DataSource) {

    super(User, dataSource.manager);

  }

  async createUser(authCredentialsDto: AuthCredentialsDto): Promise<void> {

    const { username, password } = authCredentialsDto;

    const user = this.create({ username, password });

    await this.save(user);

  }

}

• controller, service, repository 코드를 작성한다