Kohana ORM has_many belongs_to

Question

可以說我有3個模型，一，二和三。

Model One有很多Three，Model Two有很多Three，Three屬於One和Two。

型號：

class Model_One extends ORM { 

protected $_primary_key = 'one_id'; 

protected $_has_many = array(
    'threes'=> array(
     'model' => 'three',     
     'through' => 'ones_threes', 
     'far_key' => 'three_id',  
     'foreign_key' => 'one_id' 
     ), 
    ); 
} 

class Model_Two extends ORM { 

protected $_primary_key = 'two_id'; 

protected $_has_many = array(
    'threes'=> array(
     'model' => 'three',     
     'through' => 'twos_threes', 
     'far_key' => 'three_id',  
     'foreign_key' => 'two_id' 
     ), 
    ); 
} 

class Model_Three extends ORM { 

protected $_primary_key = 'three_id'; 

protected $_belongs_to = array(
    'ones'=> array(
     'model' => 'one',     
     'through' => 'ones_threes',  
     'far_key' => 'one_id',  
     'foreign_key' => 'three_id' 
     ), 

'twos'=> array(
     'model' => 'two',     
     'through' => 'twos_threes',  
     'far_key' => 'two_id',  
     'foreign_key' => 'three_id' 
     ), 
); 
} 

我顯示的一個，兩個，三個。

$getTwos=ORM::factory('two')->find_all(); 

foreach($getTwos as $getTwo) 
{ 
    echo $getTwo->two_category_title; 
    foreach($getTwo->three->find_all() as $getThree) 
    { 
     echo $getThree->three_title; 
     echo $getThree->one->one_author; 
    } 
} 

可以說我有作者A和B以及標題1，標題2，標題3，和標題4.一種具有標題1，2，3，和B具有標題4.

問題是echo $ getThree-> one-> one_author;將回顯A，B，NULL，NULL。

如何正確回顯信息？

Answer 1

您的模型Three中有錯誤的關係定義。好像One已經和屬於很多Threes（HABTM或「有很多通過」），同樣爲Two模型。以下是你需要什麼：

class Model_Three extends ORM { 

protected $_primary_key = 'three_id'; 

protected $_has_many = array(
    'ones'=> array(
     'model' => 'one',     
     'through' => 'ones_threes',  
     'far_key' => 'one_id',  
     'foreign_key' => 'three_id' 
     ), 

    'twos'=> array(
     'model' => 'two',     
     'through' => 'twos_threes',  
     'far_key' => 'two_id',  
     'foreign_key' => 'three_id' 
     ), 
    ); 
} 

PS。 foreign_key是可選的，因爲您已經在$_primary_key屬性中定義了它。

PPS。以下是「帖子屬於僅一個用戶」關係的示例：

class Model_User extends ORM { 

    protected $_has_many = array(
     'posts' => array(), 
    ); 
} 

class Model_Post extends ORM { 

    protected $_belongs_to = array(
     'author' => array(
      'model'  => 'user', 
      // ignore if you have a `author_id` foreign key 
      'foreign_key' => 'user_id', 
    ), 
    ); 

    protected $_has_many = array(...); 
} 

// usage 
$post = ORM::factory('post', 1); 
echo $post->author->username; 
$post->author = ORM::factory('user', 1); 
$user = ORM::factory('user', 1); 
foreach($user->posts->where('published', '=', 1)->find_all() as $posts) { 
    echo $post->title; 
}