浪花 - 添加队伍业务开发

一、接口设计

1. 请求参数：封装添加队伍参数 TeamAddRequest

package com.example.usercenter.model.request;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import lombok.Data;

import java.io.Serializable;
import java.util.Date;

/**
 * 用户登录请求参数
 * @author Ghost
 * @version 1.0
 */
@Data
public class TeamAddRequest implements Serializable{

    private static final long serialVersionUID = 6993746803531411917L;

    /**
     * id
     */
    @TableId(type = IdType.AUTO)
    private Long id;

    /**
     * 队伍名称
     */
    private String name;

    /**
     * 描述
     */
    private String description;

    /**
     * 最大人数
     */
    private Integer maxNum;

    /**
     * 过期时间
     */
    private Date expireTime;

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

    /**
     * 0 - 公开，1 - 私有，2 - 加密
     */
    private Integer status;

    /**
     * 密码
     */
    private String password;
}

2. 请求路径：/team/add

3. 请求方式：POST

4. 响应数据：添加成功的队伍 id

二、业务逻辑

1. 请求参数是否为空？

2. 是否登录，未登录不允许创建

3. 校验信息

队伍人数 > 1 且 <= 20
队伍标题 <= 20
描述 <= 512
status 是否公开（int）不传默认为 0（公开）
如果 status 是加密状态，一定要有密码，且密码 <= 32
超时时间 > 当前时间
校验用户最多创建 5 个队伍

4. 插入队伍信息到队伍表

5. 插入用户 => 队伍关系到关系表

注意❗

操作两张表（队伍表和用户队伍关系表）时需要开启事务功能，使用 @Transactional 注解在方法上开启事务
如果添加队伍和添加用户队伍关系中间出现异常，添加队伍也失败，回滚到方法执行之前

Controller

    @PostMapping("/add")
    public BaseResponse<Long> addTeam(@RequestBody TeamAddRequest teamAddRequest, HttpServletRequest request) {
        if (teamAddRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        User loginUser = userService.getLoginUser(request);
        Team team = new Team();
        BeanUtils.copyProperties(teamAddRequest, team);
        long teamId = teamService.addTeam(team, loginUser);
        return ResultUtils.success(teamId);
    }

Service

package com.example.usercenter.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.usercenter.common.ErrorCode;
import com.example.usercenter.constant.enums.TeamStatusEnum;
import com.example.usercenter.exception.BusinessException;
import com.example.usercenter.model.domain.Team;
import com.example.usercenter.model.domain.User;
import com.example.usercenter.model.domain.UserTeam;
import com.example.usercenter.service.TeamService;
import com.example.usercenter.mapper.TeamMapper;
import com.example.usercenter.service.UserTeamService;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.Date;
import java.util.Optional;

/**
* @author 20890
* @description 针对表【team(队伍)】的数据库操作Service实现
* @createDate 2024-01-22 18:27:55
*/
@Service
public class TeamServiceImpl extends ServiceImpl<TeamMapper, Team>
    implements TeamService{

    @Resource
    private UserTeamService userTeamService;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long addTeam(Team team, User loginUser) {
        // 1. 请求参数是否为空？
        if (team == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        // 2. 是否登录，未登录不允许创建
        if (loginUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN);
        }

        final long userId = loginUser.getId();

        // 3. 校验信息
        //   1. 队伍人数 > 1 且 <= 20
        int maxNum = Optional.ofNullable(team.getMaxNum()).orElse(0);
        if (maxNum < 1 || maxNum > 20) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍人数不符合要求");
        }
        //   2. 队伍标题 <= 20
        String name = team.getName();
        if (StringUtils.isBlank(name) || name.length() > 20) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍标题不符合要求");
        }
        //   3. 描述 <= 512
        String description = team.getDescription();
        if (StringUtils.isNotBlank(description) && description.length() > 512) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍描述不符合要求");
        }
        //   4. status 是否公开（int）不传默认为 0（公开）
        int status = Optional.ofNullable(team.getStatus()).orElse(0);
        TeamStatusEnum teamStatus = TeamStatusEnum.getTeamEnumByValue(status);
        if (teamStatus == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍状态不符合要求");
        }
        //   5. 如果 status 是加密状态，一定要有密码，且密码 <= 32
        String password = team.getPassword();
        if (status == TeamStatusEnum.SECRET.getValue() && (StringUtils.isBlank(password) || password.length() > 32)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍密码不符合要求");
        }
        //   6. 超时时间 > 当前时间
        Date expireTime = team.getExpireTime();
        if (new Date().after(expireTime)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "超时时间已到，队伍失效");
        }
        //   7. 校验用户最多创建 5 个队伍
        // TODO 有 bug，用户可能同时创建很多个队伍
        QueryWrapper<UserTeam> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", userId);
        long hasTeamNum = userTeamService.count(queryWrapper);
        if (hasTeamNum >= 5) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "每个用户最多创建 5 个队伍");
        }
        // 4. 插入队伍信息到队伍表
        team.setId(null);
        team.setUserId(userId);
        boolean result = this.save(team);
        Long teamId = team.getId();
        if (!result || teamId == null) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR,"创建队伍失败");
        }
        // 5. 插入用户  => 队伍关系到关系表
        UserTeam userTeam = new UserTeam();
        userTeam.setUserId(userId);
        userTeam.setTeamId(teamId);
        userTeam.setJoinTime(new Date());
        result = userTeamService.save(userTeam);
        if (!result) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR,"创建队伍失败");
        }
        return teamId;
    }
}