Php 如何访问Laravel中的嵌套关系数据

使用Laravel 5.4，以及

模型关系：

Painter (has many) Paintings
Hall (has many) Paintings

$halls = Hall::with(paintings.painter)->get();

public function getPaintersAttribute() {
  return \App\Painter::select('painters.*')
    ->join('paintings', 'painter_id', 'painters.id')
    ->where('paintings.hall_id', $this->id)
    ->groupBy('painter.id')
    ->orderBy('name')
    ->get();
}

反过来说：

Painting (belongs to one) Painter
Painting (belongs to one) Hall

霍尔控制器索引（）获取集合：

Painter (has many) Paintings
Hall (has many) Paintings

$halls = Hall::with(paintings.painter)->get();

public function getPaintersAttribute() {
  return \App\Painter::select('painters.*')
    ->join('paintings', 'painter_id', 'painters.id')
    ->where('paintings.hall_id', $this->id)
    ->groupBy('painter.id')
    ->orderBy('name')
    ->get();
}

霍尔模型有一个供画家使用的存取器：

Painter (has many) Paintings
Hall (has many) Paintings

$halls = Hall::with(paintings.painter)->get();

public function getPaintersAttribute() {
  return \App\Painter::select('painters.*')
    ->join('paintings', 'painter_id', 'painters.id')
    ->where('paintings.hall_id', $this->id)
    ->groupBy('painter.id')
    ->orderBy('name')
    ->get();
}

在模板中：

{{ $hall->painters->count() }}

@foreach ($hall->painters as $painter)
    painter: {{ $painter->name }}
@endforeach

这是可行的，但是

有两个数据库查询嵌套的急切加载关系：

SELECT * FROM 'paintings' WHERE hall_id IN ( <list of hall_id's> )

SELECT * FROM 'painters' WHERE painter_id IN ( <list of painter_id's for that hall> )

hasManyThrough不起作用，因为这种关系不起作用 霍尔有油漆工

我可以将一个变量与数据一起从控制器传递到视图，但这样做似乎很奇怪，因为嵌套关系已经被加载了

是否有其他方法可以访问视图中作为集合的嵌套数据