[타임라인 서비스]-Service 만들기

Service 부분을 만들어보았다

service

package com.sparta.week03.service;

import com.sparta.week03.domain.Memo;
import com.sparta.week03.domain.MemoRepository;
import com.sparta.week03.domain.MemoRequestDto;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;

@RequiredArgsConstructor
@Service
public class MemoService {

    private final MemoRepository memoRepository;

    @Transactional
    public Long update(Long id, MemoRequestDto requestDto){
        Memo memo = memoRepository.findById(id).orElseThrow(
                () -> new IllegalArgumentException("아이디가 존재하지 않습니다.")
        );
        memo.update(requestDto);
        return memo.getId();
    }
}

그리고 Memo.java에 update를 추가해주었다

public void update(MemoRequestDto requestDto){
        this.username = requestDto.getUsername();
        this.contents = requestDto.getContents();
    }