如何在CakePHP 3中列出hasMany关系中的对象？

Question

我正在努力获取CakePHP 3中hasMany关系的数据。我正在研究一个基础论坛，而我目前的问题是指类别和主题之间的关系。一个类别包含几个主题，而每个主题都属于一个单独的类别。对于我使用烘焙机制的类别和主题，并将关系添加到表格中。这是CategoriesTable类initialize方法：

public function initialize(array $config) { 
    parent::initialize($config); 

    $this->table('categories'); 
    $this->displayField('name'); 
    $this->primaryKey('id'); 

    $this->addBehavior('Timestamp'); 

    $this->hasMany('Topics', [ 
     'foreignKey' => 'category' 
    ]); 
} 

而这里的TopicsTable相同：

public function initialize(array $config) { 
    parent::initialize($config); 

    $this->table('topics'); 
    $this->displayField('id'); 
    $this->primaryKey('id'); 

    $this->addBehavior('Timestamp'); 

    $this->belongsTo('Categories', [ 
     'foreignKey' => 'category' 
    ]); 
} 

现在我想列出这样一个类别（Categories\view.cpt）的主题：

<h1><?= $category->name ?></h1> 
<table> 
    <?php foreach ($topics as $topic): ?> 
    <tr> 
     <td> 
      <?= $topic->name ?> 
     </td> 
    </tr> 
    <?php endforeach; ?> 
</table> 

如何获取与当前所选类别相关的所有主题列表？

Answer 1

类别控制器：

$topics = $this->Category->Topic->find('list', [ 
    'keyField' => 'id', 
    'valueField' => 'Topic.category' 
]) 
->where(['category' => $category]); 

http://book.cakephp.org/3.0/en/orm/retrieving-data-and-resultsets.html#finding-key-value-pairs

Answer 2

感谢法案的提示。以下是我在类别控制器中的查看方法：

public function view($id = null) { 
    $category = $this->Categories->get($id, [ 
     'contain' => [] 
    ]); 

    $this->set('category', $category); 
    $this->set('_serialize', ['category']); 

    $topics = $this->Categories->Topics->find()->where(['category' => $id]); 
    $this->set('topics', $topics); 
}