来自枢轴的Laravel关系

Question

我有一个关系，我无法弄清楚我当前的应用程序看起来像这样

模型

User.php
    public function teams()
    {
        return $this->belongsToMany(Team::class);
    }

Team.php

    public function tournaments()
    {
        return $this->belongsToMany(Tournament::class);
    }

Tournament.php

    public function teams()
    {
        return $this->belongsToMany(Team::class);
    }

表格

tournaments
id

teams
id

team_tournament
tournament_id
team_id

现在锦标赛可以只有部分用户参加锦标赛，所以我创建了以下内容

team_tournament_users
tournament_id
team_id
user_id

存储团队中参加锦标赛的用户。

这应该如何看待雄辩的关系？

Answer 1

所以带着你的 team_tournament_users，我会做以下事情

将使用锦标赛的命名约定 participants，因此桌名将是 participants 而不是 team_tournament_users

迁移

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateParticipantsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('participants', function (Blueprint $table) {
            $table->foreignId('tournament_id')->constrained();
            $table->foreignId('user_id')->constrained();
            $table->foreignId('team_id')->constrained();
            $table->timestamps();

            $table->primary(['tournament_id', 'user_id']);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('participants');
    }
}

关系：然后会在模型中定义以下关系

class User extends Model
{

    public function teams()
    {
        return $this->belongsToMany(Team::class);
    }

    public function tournaments()
    {
        return $this->belongsToMany(Tournament::class, 'participants')
            ->withPivot('team_id')
            ->withTimestamps();
    }
}


class Tournament extends Model
{

    public function teams()
    {
        return $this->belongsToMany(Team::class);
    }

    public function participants()
    {
        return $this->belongsToMany(User::class, 'participants')
            ->withPivot('team_id')
            ->withTimestamps();
    }
}

class Team extends Model
{

    public function users()
    {
        return $this->belongsToMany(User::class)->withTimestamps();
    }

    public function tournaments()
    {
        return $this->belongsToMany(Tournament::class)->withTimestamps();
    }
}

然后我将如何检索所有参与特定锦标赛的团队的用户？因此，如果从一个团队中选择了 3 位用户/成员参加比赛，我如何轻松找出该团队中的哪些成员被选中？

//There's already a relation between Tournament and Team(s)
//So we can use it to get the tournament participants from the team

$t = Tournament::with('participants')->first()
  ->participants
  ->groupBy(function($participant){
    return $participant->pivot->team_id;    
  });

//If Team with an id of 5 has members participating in the tournament
//Then we can get the members of Team as
$team = Team::findOrFail(5);
$t->get($team->id);