如何验证 Laravel 请求中的选择

Question

我正在构建一个应用程序来创建足球（英式足球）比赛。创建比赛时，我需要检查所选球队是否在所选联赛中。

提交表单时，我想显示一条消息，说明选择了错误的联赛。

控制器中有store()方法

$match = new Match;
$match->round = $request->round;
$match->league_id = $request->league;
$match->home_team_id = $request->home_team;
$match->away_team_id = $request->away_team;
$match->match_date = $request->match_date;
$match->location = $request->location;

团队模型：

class Team extends Model
{
    public function league() {
        return $this->belongsTo('App\League');
    }
}

联赛模型：

class League extends Model
{
    public function teams() {
        return $this->hasMany('App\Team');
    }
}

Answer 1

这是 Laravel docs 验证

Answer 2

如果不存在 id 给定的联赛 league_id，您可以使用关闭规则验证传入请求以对 return true 进行数据库查询] 并让团队具有给定的 home_team_id 和 away_team_id。然后如果联盟不存在，则抛出验证失败：

$request->validate([
    'home_team_id' => ['required'],
    'away_team_id' => ['required'],
    'league_id' => [
        'required',
        function ($attribute, $value, $fail) {
            $condition = League::where('id', request('league_id')
                ->whereHas('teams', function($q) {
                    $q->where('id', request('home_team_id'))->where('id', request('away_team_id'));
                })->doesntExist();
            if ($condition) {
                $fail('Both Teams must belong to the selected League.');
            }
        },
    ],
]);

参考文献：

验证Using Closures.
Eloquent Querying Relationship Existence.
数据库查询生成器Determining If Records Exist。

如何验证 Laravel 请求中的选择

How to validate selection in Laravel Request

model-view-controller

laravel

eloquent

laravel-5