CakePHP中的动态模型关系 [英] Dynamic model relations in CakePHP

问题描述

我正在尝试根据环境变量来定义特定模型的关系.
像这样:

I'm trying to define the relations for a specific Model depending on environment variables.
Like this:

class Book extends AppModel {
    public function __construct($id = false, $table = null, $ds = null) {
        parent::__construct($id, $table, $ds);

        if (Configure::read('prefix') == 'admin') {
            $this->hasMany['Page'] = array(
                // ...
                'conditions' => array( /* all pages */ )
            );
        } else {
            $this->hasMany['Page'] = array(
                // ...
                'conditions' => array( /* only public pages */ )
            );
        }
    }
}

您可能会争辩说我应该在查询中应用这些条件.但是因为我正在处理深层嵌套的关系，所以我希望保持条件集中.

You could argue that I should apply these conditions in the query. But because I'm working with deeply nested relations I wanted to keep conditions centralised.

现在出现的问题是:如果Page模型与例如Paragraph模型并从我正在尝试的BookController中获取:

Now the problem that occurs is: if the Page model has relations to e.g. the Paragraph model and from the BookController I'm trying:

$this->Book->find('first', array(
    'conditions' => array('Book.id'=>1),
    'contain' => array('Page' => array('Paragraph'))
));

... CakePHP会告诉我Paragraph与Page模型无关.

... CakePHP will tell me that Paragraph is not related to the Page model.

如果我通过定义模型属性来创建关系，则一切顺利:

If I create the relation by defining a model attribute all goes well:

class Book extends AppModel {
    public $hasMany = array(
        'Page' => array(
            // ...
        )
    );
}

这是为什么?我需要手动建立那些关系吗?我的时间(__construct())是否不正确，应该在其他地方进行吗?

Why is this? Do I need to manually establish those relations? Is my timing (__construct()) incorrect and should this be done elsewhere?

亲切的问候， 巴特

推荐答案

是的，您的时间安排不正确.您应该在调用父构造函数之前 应用以下配置选项:

Yes, your timing is incorrect. You should either apply these configuration options before invoking the parent constructor:

if (Configure::read('prefix') == 'admin') {
    // ...
}

parent::__construct($id, $table, $ds);

或使用Model::bindModel()代替，这将创建必要的链接:

or use Model::bindModel() instead which will create the necessary links:

$this->bindModel(
    array('hasMany' => array(
        'Page' => array(
            // ...
            'conditions' => array( /* ... */ )
        )
    )),
    false
);

另请参见 http://book.cakephp.org/...html#creating-and-destroying-associations-on-fly

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