Laravel 5 急切加载没有直接关系的模型

Question

我有..

模型：

Player
id,player_name

Sport
id,sports_name

Game
id,player_id,sports_id,scores

模型关系

玩家 hasMany 游戏、体育 hasMany 游戏 strong>、游戏 属于 玩家和体育。

---

问题：在 Controller 中，是否可能 加载 Sports 和每个 Games 每个运动的每个 玩家？

在单个查询中，我想在我的 Blade 中实现这样的目标..

@foreach($player as $p)
  @foreach ($p->sport as $ps) /*this wont work, since player has not relationship with sports*/
    @foreach ($ps->game as $psg)
      {{$psg->id}}
      {{$psg->player_name}}
      {{$psg->sports_name}}
      {{$psg->scores}}
    @endforeach    
  @endforeach
@endforeach

还有其他方法可以实现吗？谢谢！

Answer 1

Player 和Sport 之间的关系也是many-to-many。

因此您可以在Player 模型中定义sports 关系为：

public function sports()
{
  return $this->belongsToMany('App\Sport', 'games')->withPivot('scores');
}

那么在您看来，您可以将foreach 写为：

@foreach($player as $p)
  @foreach ($p->sports as $s)
      {{$p->player_name}}
      {{$s->sports_name}}
      {{$s->pivot->scores}}
  @endforeach
@endforeach

Answer 2

你可以使用Nested eager loading：玩家有很多游戏，游戏属于一项运动。

$player=Player::with('games','games.sport')->find($id);
foreach($player->games as $game)
{
   echo $game;
   echo $game->sport;
}