has_many和has_one關係SilverStripe

我按照https://www.silverstripe.org/learn/lessons/working-with-data-relationships-has-many?ref=hub上的教程創建了一些我的主頁的特色項目。但不知何故，我錯過了一塊，因爲我得到這個錯誤has_many和has_one關係SilverStripe

[錯誤]未捕獲的異常：沒有HAS_ONE階級「HomePageFeatured」發現，從「主頁」，以「HomePageFeatured」的的has_many關係需要在「HomePageFeatured」

一個HAS_ONE

HomePage.php

<?php 
/** 
* Defines the HomePage page type 
*/ 

class HomePage extends Page { 
    // private static $db = array(
    //); 
    // private static $has_one = array(
    //); 

    private static $has_many = array (
     'Featured' => 'HomePageFeatured' 
    ); 

    public function getCMSFields() { 
      $fields = parent::getCMSFields(); 
      $fields->addFieldToTab('Root.Featured', GridField::create(
       'Featured', 
       'Hervorgehobene Produkte', 
       $this->Featured(), 
       GridFieldConfig_RecordEditor::create() 
      )); 

      return $fields; 
     } 

    private static $icon = "themes/hstheme/images/treeicons/home"; 
} 

class HomePage_Controller extends Page_Controller { 

}

HomePageFeatured.php

<?php 
/** 
* Holds the featured items from the Homepage 
*/ 

class HomePageFeatured extends DataObject { 
    private static $db = array(
     'Title' => 'Varchar', 
     'Description' => 'Text' 
    ); 
    private static $has_one = array(
     'Photo' => 'Image', 
     'HomePageFeatured' => 'HomePageFeatured' 
    ); 

    public function getCMSFields() { 
     $fields = FieldList::create(
      TextField::create('Title'), 
      TextareaField::create('Description'), 
      $uploader = UploadField::create('Photo') 
     ); 

     $uploader->setFolderName('featured-photos'); 
     $uploader->getValidator()->setAllowedExtensions(array('png','gif','jpeg','jpg')); 

     return $fields; 
    } 

}

據我所知，這個問題是由公司首頁的$ HAS_ONE eFeatured.php。但它有一個來自HomePageFeatured的參考。

來源

2016-12-07 suntrop

HomePageFeatured需要 '主頁'

class HomePageFeatured extends DataObject { 
    private static $has_one = array(
     'Photo' => 'Image', 
     'Parent' => 'HomePage', 
    ); 
}

來源

2016-12-07 10:26:24 SilbinaryWolf

許多感謝的HAS_ONE！教程中有一個「暗示」：「通常情況下，相互之間的這種情況只能以父類命名。」不知道是否有關鍵字Parent。 – suntrop

@suntrop在這種情況下，'Parent''就是你的'HomePageFeatured'和你的'HomePage'之間的關係的名字。這個關係名稱可以是任何東西。我建議你小心使用'Parent'作爲關係的名字，因爲這已經是所有'頁面'上的一個關係，引用它是站點樹層次結構中的父項。因此，如果您的'HomePageFeatured'擴展了'Page'而不是'DataObject'，那麼您可能會以'Parent''作爲關係名稱獲得意想不到的後果。本教程建議您這樣做：'private static $ has_one = ['HomePage'=>'HomePage']'。 –

has_many和has_one關係SilverStripe

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