Laravel有许多分离

Question

我对Eloquent有关删除子模型的问题： 当在process2()中执行此操作时，我仍然有删除的模型，这是不正确的。

模型

    namespace App\Models;

    use Illuminate\Database\Eloquent\Model;

    class Model1 extends Model
    {
        public function seasons() {
            return $this->hasMany('App\Models\Seasons', 'series_id', 'id');
        }
    }

服务

class Process {
    public function process1($model1Instance) {

        for($model1Instance->seasons() as $season) {
            if(//whatever//) {
                $season->delete();
            }
        }
    }
    public function process2($model1Instance) {
        for($model1Instance->seasons() as $season) {
            //At this point I still have the deleted instance
        }
    }
}

用法

$proc = new Process();
......
$proc->process1($model1Instance);
$proc->process2($model1Instance);

当process1()从父级移除模型时，如何在process2()中移除模型？

尝试/将尝试：

1.Method：     $ model1Instance-＆GT;季节（） - ＆GT;分离（$季节）; 但得到了：Call to undefined method Illuminate\Database\Query\Builder::detach()

2.另一堂课     我可以制作另一个简单的类来存储这些，但我不认为它没关系，虽然我可以设置过滤季节，但仍然必须使用Model1实例：

class Model1Copy {
    private $seasons;
    public function __construct($seasons) {
        $this->seasons = $seasons;
    }
}

1. 尝试时致命：

   public function process1（$ model1Instance）{

   for($model1Instance->seasons() as $season) {
       if(//whatever//) {
           $season->delete();
       } else {
       $childs[]=$season;
       }
   }
   $model1Instance->seasons = $childs
   

   }

2. 将使我自己的存储库跳过ORM的行为，但它令人沮丧，因为我必须重写所有查询只是为了删除一个实例......

Answer 1

$model->seasons()返回关系，而$model->seasons返回映射到模型的季节集合。请尝试以下方法。

public function process1($model1Instance) {

    // Iterate over the collection
    for($model1Instance->seasons as $season) {
        if(condition) {
            $model1Instance->seasons()->detach($season); 
            $season->delete();
        }
    }

    $model1Instance->save();
}

此外，您正在迭代所有模型的所有季节，并删除满足某些条件的季节。如果你一次性摧毁所有季节，那会不会更有效率。如下所示：

$seasons = Season::where(condition)->get();
Season::destroy($seasons);

Answer 2

尝试一下

public function process1($model1Instance) {

    // Iterate over the collection
    for($model1Instance->seasons as $season) {
        if(condition) {
            $season->delete();
        }
    }

    $model1Instance->save();
}

Answer 3

要删除hasMany条记录，条件如下：

$model1Instance->seasons()->where('condition', 'met')->delete();

要全部删除：

$model1Instance->seasons()->delete();