問題描述

我有以下帶有關系的 Eloquent 模型:

I have the following Eloquent Models with relationships:

class Lead extends Model 
{
    public function contacts() 
    {
        return $this->belongsToMany('AppContact')
                    ->withPivot('is_primary');
    }
}

class Contact extends Model 
{
    public function leads() 
    {
        return $this->belongsToMany('AppLead')
                    ->withPivot('is_primary');
    }
}

數據透視表包含一個附加參數 (is_primary)，用于將關系標記為主要關系.目前，我在查詢聯系人時看到這樣的返回:

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"
             }
        }
    ]
}

有沒有辦法將其中的 is_primary 轉換為布爾值?我已經嘗試將它添加到兩個模型的 $casts 數組中，但這并沒有改變任何東西.

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.

推薦答案

由于這是數據透視表上的一個屬性，因此使用 $casts 屬性將不適用于 Lead 或 Contact 模型.

Since this is an attribute on the pivot table, using the $casts attribute won't work on either the Lead or Contact model.

但是，您可以嘗試的一件事是使用自定義 Pivot 模型并定義了 $casts 屬性.自定義數據透視模型的文檔位于此處.基本上，您使用自定義創建一個新的 Pivot 模型，然后更新 Lead 和 Contact 模型以使用此自定義 Pivot 模型而不是基礎模型.

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.

首先，創建您的自定義 Pivot 模型，它擴展了基本的 Pivot 模型:

First, create your custom Pivot model which extends the base Pivot model:

<?php namespace App;

use IlluminateDatabaseEloquentRelationsPivot;

class PrimaryPivot extends Pivot {
    protected $casts = ['is_primary' => 'boolean'];
}

現在，覆蓋 Lead 和 Contact 模型上的 newPivot() 方法:

Now, override the newPivot() method on the Lead and the Contact models:

class Lead extends Model {
    public function newPivot(Model $parent, array $attributes, $table, $exists) {
        return new AppPrimaryPivot($parent, $attributes, $table, $exists);
    }
}

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

這篇關于如何投射 Eloquent Pivot 參數?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！