10.1 关注和取消关注

Field Type Collation Null Key Default Extra Comment
id bigint (NULL) NO PRI (NULL) auto_increment 主键
user_id bigint unsigned (NULL) NO (NULL) 用户id
follow_user_id bigint unsigned (NULL) NO (NULL) 关联的用户id
create_time timestamp (NULL) NO CURRENT_TIMESTAMP DEFAULT_GENERATED 创建时间 
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("tb_follow")
public class Follow implements Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * 主键
     */
    @TableId(value = "id", type = IdType.AUTO)
    private Long id;

    /**
     * 用户id
     */
    private Long userId;

    /**
     * 关联的用户id
     */
    private Long followUserId;

    /**
     * 创建时间
     */
    private LocalDateTime createTime;
}

那我们现在来Controller层中编写对应的两个方法

@RestController
@RequestMapping("/follow")
public class FollowController {
    @Resource
    private IFollowService followService;
    //判断当前用户是否关注了该博主
    @GetMapping("/or/not/{id}")
    public Result isFollow(@PathVariable("id") Long followUserId) {
        return followService.isFollow(followUserId);
    }
    //实现取关/关注
    @PutMapping("/{id}/{isFollow}")
    public Result follow(@PathVariable("id") Long followUserId, @PathVariable("isFollow") Boolean isFellow) {
        return followService.follow(followUserId,isFellow);
    }
}

具体的业务逻辑我们还是放在FellowServiceImpl中来编写

@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {

    @Override
    public Result isFollow(Long followUserId) {
        //获取当前登录的userId
        Long userId = UserHolder.getUser().getId();
        LambdaQueryWrapper<Follow> queryWrapper = new LambdaQueryWrapper<>();
        //查询当前用户是否关注了该笔记的博主
        queryWrapper.eq(Follow::getUserId, userId).eq(Follow::getFollowUserId, followUserId);
        //只查询一个count就行了
        int count = this.count(queryWrapper);
        return Result.ok(count > 0);
    }

    @Override
    public Result follow(Long followUserId, Boolean isFellow) {
        //获取当前用户id
        Long userId = UserHolder.getUser().getId();
        //判断是否关注
        if (isFellow) {
            //关注，则将信息保存到数据库
            Follow follow = new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(followUserId);
            save(follow);
        } else {
            //取关，则将数据从数据库中移除
            LambdaQueryWrapper<Follow> queryWrapper = new LambdaQueryWrapper<>();
            queryWrapper.eq(Follow::getUserId, userId).eq(Follow::getFollowUserId, followUserId);
            remove(queryWrapper);
        }
        return Result.ok();
    }
}

10.2 共同关注

@GetMapping("/{id}")
public Result queryById(@PathVariable("id") Long userId) {
    // 查询详情
    User user = userService.getById(userId);
    if (user == null) {
        // 没有详情，应该是第一次查看详情
        return Result.ok();
    }
    UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
    // 返回
    return Result.ok(userDTO);
}