如何铸就雄辩的枢轴参数？ [英] How To Cast Eloquent Pivot Parameters?

问题描述

我有以下具有关系的雄辩模型：

  class Lead extends Model {
 public function contacts（） {
 return $ this-> belongsToMany（'App \Contact'）
  - > withPivot（'is_primary'）; 
} 
} 
 
 class Contact扩展模型{
 public function leads（）{
 return $ this-> belongsToMany（'App'\\Lead '）
  - > withPivot（'is_primary'）; 
} 
} 
  

数据透视表包含一个额外的参数（ is_primary ）标记一个关系作为主要的。目前，当我查询联系人时，我会看到这样的回报：

  {
id：565，
lead：[
 {
id：349，
pivot：{
contact_id：565，
lead_id ：349，
is_primary：0
} 
} 
] 
} 
  pre> 
 
 
有没有办法将 is_primary 转换为布尔值？我已经尝试将它添加到两个模型的 $ casts 数组中，但没有改变任何东西。
解决方案
由于这是数据透视表上的属性，因此使用 $ casts 属性将无法在领导或联系模型。
 
 
 
但是，有一件事可以尝试使用定义的 $ casts 属性定制数据透视模型。关于自定义枢纽模型的文档是 here 。基本上，您可以使用自定义创建一个新的数据透视表 c> c，然后更新 Lead 和联系模型以使用此自定义数据透视模型而不是基础模型。
 
 
 
首先，创建您的自定义 Pivot 模型，扩展基础数据透视模型：
 <？php命名空间应用程序; 
 
使用Illuminate\Database\Eloquent\Relations\Pivot; 
 
 class PrimaryPivot extends Pivot {
 protected $ casts = ['is_primary'=> 布尔]; 
} 
  
现在，覆盖 newPivot（） Lead 和联系人模型中的c $ c>方法：
  class Lead extends Model {
 public function newPivot（Model $ parent，array $ attributes，$ table，$ exists）{
 return new \App \PrimaryPivot（$ parent，$ attributes，$ table，$ exists）; 
} 
} 
 
 class Contact扩展模型{
 public function newPivot（Model $ parent，array $ attributes，$ table，$ exists）{
返回新的\App\PrimaryPivot（$ parent，$ attributes，$ table，$ exists）; 
} 
} 
  
 
I have the following Eloquent Models with relationships:
class Lead extends Model {
    public function contacts() {
        return $this->belongsToMany('App\Contact')
                    ->withPivot('is_primary');
    }
}

class Contact extends Model {
    public function leads() {
        return $this->belongsToMany('App\Lead')
                    ->withPivot('is_primary');
    }
}
The pivot table contains an additional param (is_primary) that marks a relationship as the primary. Currently, I see returns like this when I query for a contact:
{
    "id": 565,
    "leads": [
        {
            "id": 349,
             "pivot": {
                "contact_id": "565",
                "lead_id": "349",
                "is_primary": "0"
             }
        }
    ]
}
Is there a way to cast the is_primary in that to a boolean? I've tried adding it to the $casts array of both models but that did not change anything.
解决方案
Since this is an attribute on the pivot table, using the $casts attribute won't work on either the Lead or Contact model.

One thing you can try, however, is to use a custom Pivot model with the $casts attribute defined. Documentation on custom pivot models is here. Basically, you create a new Pivot model with your customizations, and then update the Lead and the Contact models to use this custom Pivot model instead of the base one.

First, create your custom Pivot model which extends the base Pivot model:
<?php namespace App;

use Illuminate\Database\Eloquent\Relations\Pivot;

class PrimaryPivot extends Pivot {
    protected $casts = ['is_primary' => 'boolean'];
}
Now, override the newPivot() method on the Lead and the Contact models:
class Lead extends Model {
    public function newPivot(Model $parent, array $attributes, $table, $exists) {
        return new \App\PrimaryPivot($parent, $attributes, $table, $exists);
    }
}

class Contact extends Model {
    public function newPivot(Model $parent, array $attributes, $table, $exists) {
        return new \App\PrimaryPivot($parent, $attributes, $table, $exists);
    }
}


                        
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