浪花 - 用户加入队伍

一、接口设计

1. 请求参数：TeamJoinRequest

package com.example.usercenter.model.request;

import lombok.Data;
import java.io.Serializable;

/**
 * 加入队伍请求参数封装类
 */
@Data
public class TeamJoinRequest implements Serializable {
    private static final long serialVersionUID = 4442151141560122843L;

    /**
     * 队伍 id
     */
    private Long teamId;

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

2. 请求路径：/team/join

3. 请求方式：POST

4. 响应数据：BaseResponse<Boolean>

二、业务逻辑

1. 最多加入 5 个队伍

2. 队伍必须存在，只能加入未满、未过期的队伍

3. 不能加入自己的队伍，不能重复加入已加入的队伍（幂等性）

4. 禁止加入私有的队伍

5. 如果加入的队伍是加密的，必须密码匹配才可以加入

6. 新增队伍 - 用户关联信息

优化：将涉及到数据库查询的校验放到后面进行，如果前面的校验未通过，直接抛出异常，减少数据库资源的消耗

    @Override
    public boolean joinTeam(TeamJoinRequest teamJoinRequest, User loginUser) {
        if (teamJoinRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        // 1. 用户最多创建和加入 5 个队伍
        Long userId = loginUser.getId();
        QueryWrapper<UserTeam> userTeamQueryWrapper = new QueryWrapper<>();
        userTeamQueryWrapper.eq("user_id", userId);
        long hasJoinNum = userTeamService.count(userTeamQueryWrapper);
        if (hasJoinNum >= 5) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户最多创建和加入 5 个队伍");
        }

        // 2. 队伍必须存在，只能加入未满、未过期的队伍
        Long teamId = teamJoinRequest.getTeamId();
        Team team = this.getById(teamId);
        if (team == null) {
            throw new BusinessException(ErrorCode.NULL_ERROR, "队伍不存在");
        }
        userTeamQueryWrapper = new QueryWrapper<>();
        userTeamQueryWrapper.eq("team_id", teamId);
        long teamHasJoinNum = userTeamService.count(userTeamQueryWrapper);
        if (teamHasJoinNum >= team.getMaxNum()) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "队伍人数已满");
        }
        Date expireTime = team.getExpireTime();
        if (expireTime != null && expireTime.before(new Date())) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"队伍已过期");
        }

        // 3. 不能加入自己的队伍，不能重复加入已加入的队伍（幂等性）
//        if (team.getUserId() == userId) {
//            throw new BusinessException(ErrorCode.PARAMS_ERROR,"不能加入自己创建的队伍");
//        }
        userTeamQueryWrapper = new QueryWrapper<>();
        userTeamQueryWrapper.eq("team_id", teamId);
        userTeamQueryWrapper.eq("user_id", userId);
        long alreadyJoinNum = userTeamService.count(userTeamQueryWrapper);
        if (alreadyJoinNum > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户已加入该队伍");
        }

        // 4. 禁止加入私有的队伍
        Integer status = team.getStatus();
        TeamStatusEnum teamStatusEnum = TeamStatusEnum.getTeamEnumByValue(status);
        if (teamStatusEnum.equals(TeamStatusEnum.PRIVATE)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "禁止加入私有的队伍");
        }

        // 5. 如果加入的队伍是加密的，必须密码匹配才可以
        String password = teamJoinRequest.getPassword();
        if (teamStatusEnum.equals(TeamStatusEnum.SECRET)) {
            if (StringUtils.isBlank(password) || !password.equals(team.getPassword())) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
            }
        }

        // 6. 新增队伍 - 用户关联信息
        UserTeam userTeam = new UserTeam();
        userTeam.setUserId(userId);
        userTeam.setTeamId(teamId);
        userTeam.setJoinTime(new Date());
        return userTeamService.save(userTeam);
    }

三、接口测试