从一对多关系中删除记录

Question

我有 3 张桌子：

用户

id
role
email
typable_id
typable_type

买家

id
name
address
avatar
email
residential_id

住宅

id
name
city 
state

这是我展示这种关系的模型

User.php

public function typable()
{
  return $this->morphTo();
}

Buyer.php

public function residential()
{
  return $this->belongsTo(Residential::class);
}

public function user()
{
  return $this->morphMany(User::class, 'typable');
}

Residential.php

public function buyer()
{
  return $this->hasMany(Buyer::class);
}

如果我想删除住宅，则需要删除该住宅的所有买家。与删除买家时也需要删除用户相同。我怎样才能做到这一点？这就是我的住宅控制器内部的销毁功能。

住宅控制器

public function destroy(Request $request) 
    {
        $residentials = Residential::find($request->input('id'));
        $residentials->id = $request->input('id');
        $residentials->name = $request->input('name');
        $residentials->delete($residentials);

        return response()->json($residentials);
    }

我已尝试将此代码用于删除买家（对于尚未使用的用户）在 destroy() 中，但要删除的买家没有任何更改。 $buyers = Buyer::where('residential_id','=',$request->residential_id)->first();$buyers->delete($buyers);

虽然这是我想删除买家时设法执行的代码，但用户也被删除了。

BuyerController

public function destroy(Request $request)
{
  $users = User::where('email', '=', $request->email)->first();
  $buyers = Buyer::find($request->input('id'));
  $buyers->id = $request->input('id');
  $buyers->name = $request->input('name');
  $buyers->delete($buyers);
  $users->delete($users);

  return response()->json($buyers);
}

希望有人帮助并教我正确的方法。

Answer 1

方法一

您可以覆盖任何模型的删除功能。

//Residential.php
public function delete()
{
    $this->buyer->delete(); 
    return parent::delete();
}

//Buyer.php
public function delete()
{
    $this->user->delete(); 
    return parent::delete();
}

现在，当您删除任何住宅记录时，连锁店将首先删除任何相关用户，然后删除买家，最后删除住宅记录。

方法 2

您可以使用each()方法获取所有相关买家，然后获取所有相关用户。

$residentials->buyer
->each(function ($b) {
    $b->user->each(function ($u) {
        $u->delete();
    });
    $b->delete();
});
$residentials->delete();

Answer 2

您可能想注册model events 来处理这个问题：

class Residential extends Model
{
    // Lets use plural form for a HasMany relationship.
    public function buyers()
    {
        return $this->hasMany(Buyer::class);
    }

    protected static function booted()
    {
        static::deleting(function ($user) {
            // I am using Higher Order Message, check this out: https://laravel.com/docs/8.x/collections#higher-order-messages
            $this->buyers->each->delete();
        });
    }
}


class Buyer extends Model
{
    // Lets use the plural form for a MorpMany relationship.
    public function users()
    {
        return $this->morphMany(User::class, 'typable');
    }

    protected static function booted()
    {
        static::deleting(function ($user) {
            $this->users->each->delete();
        });
    }
}

你只需要在你的控制器中移除一个对象：

class ResidentialController
{
    public function destroy(Request $request)
    {
        $residential = Residential::findOrFail($request->input('id'));
    
        $residential->delete();

        // The framework is gonna automatically convert this to a JSON object. 
        return $residential;
    }
}

class BuyerController
{
    public function destroy(Request $request)
    {
        $buyer = Buyer::findOrFail($request->input('id'));
    
        $buyer->delete();

        // The framework is gonna automatically convert this to a JSON object. 
        return $buyer;
    }
}