Belongs To - 關聯 - Orm 套件

关联：Belongs To

在其资料表中有关联的主键，属于一个关联物件。属于一个关联的物件。 这是 HasOne 或 HasMany 关联的另一面。

範例

Let's say we have a model Model_Comment and it belongs to a Model_Post (which in turn has many comments) the ID of the Model_Post is saved with the Model_Comment instance in its own table. This means the comments table will have a column post_id (or something else you configure). If you keep to the defaults all you need to do is add 'post' to the $_belongs_to static property of the Model_Comment:

protected static $_belongs_to = array('post');

Below are examples for establishing and breaking belongs-to relations:

// 主要及关联物件两者都是新的：
$comment = new Model_Comment();
$comment->post = new Model_Post();
$comment->save();

// both main and related object already exist
$comment = Model_Comment::find(6);
$comment->post = Model_Post::find(1);
$comment->save();

// break the relationship established above
$comment = Model_Comment::find(6);
$comment->post = null;
$comment->save();

Full config example with defaults as values

// 在属于 post 的 Model_Comment 中
protected static $_belongs_to = array(
	'post' => array(
		'key_from' => 'post_id',
		'model_to' => 'Model_Post',
		'key_to' => 'id',
		'cascade_save' => true,
		'cascade_delete' => false,
	)
);