raex_back/src/main/java/com/izouma/nineth/service/LikeService.java

package com.izouma.nineth.service;

import com.izouma.nineth.domain.Like;
import com.izouma.nineth.dto.PageQuery;
import com.izouma.nineth.repo.CollectionRepo;
import com.izouma.nineth.repo.LikeRepo;
import com.izouma.nineth.utils.JpaUtils;
import lombok.AllArgsConstructor;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
@AllArgsConstructor
public class LikeService {

    private LikeRepo       likeRepo;
    private CollectionRepo collectionRepo;

    public Page<Like> all(PageQuery pageQuery) {
        return likeRepo.findAll(JpaUtils.toSpecification(pageQuery, Like.class), JpaUtils.toPageRequest(pageQuery));
    }

    public void like(Long userId, Long collectionId) {
        List<Like> list = likeRepo.findByUserIdAndCollectionId(userId, collectionId);
        if (!list.isEmpty()) return;
        likeRepo.save(Like.builder()
                .userId(userId)
                .collectionId(collectionId)
                .build());
        collectionRepo.addLike(collectionId, 1);
    }

    public void unlike(Long userId, Long collectionId) {
        List<Like> list = likeRepo.findByUserIdAndCollectionId(userId, collectionId);
        if (!list.isEmpty()) {
            likeRepo.deleteAll(list);
            collectionRepo.addLike(collectionId, -list.size());
        }
    }
}