php - CakePHP: findById() with Containable not returning expected associations -

here's model:

class question extends appmodel {   public $hasmany = array(     'casequestions' => array('classname'=>'question', 'foreignkey'=>'parent_id') );  public $hasone = array(     'casestudy' => array('classname'=>'question', 'foreignkey'=>'parent_id') ); 

here's action in controller:

public function admin_delete_case_question($question_id) {         $this->question->behaviors->load('containable');         $this->question->contain( array('casestudy'));         $question = $this->question->findbyid($question_id );         debug($question);          exit; 

the debug above returns this:

array(     'question' => array(         'id' => '78',         'nickname' => '',         'content' => 'sdgsdfgs',         'type' => 'cq',         'option1' => 'sdfgsdfg',         'option2' => '',         'option3' => '',         'option4' => '',         'time' => '-1',         'difficulty' => '0.0000',         'slope' => '0.0000',         'chance' => '0',         'experiment' => false,         'created' => '2013-05-02 16:30:29',         'modified' => '2013-05-02 16:30:29',         'status' => null,         'perm_id' => '76',         'notes' => null,         'is_deleted' => false,         'answer_id' => '0',         'parent_id' => '77',         'order' => null     ),     'casestudy' => array(         'id' => null,         'nickname' => null,         'content' => null,         'type' => null,         'option1' => null,         'option2' => null,         'option3' => null,         'option4' => null,         'time' => null,         'difficulty' => null,         'slope' => null,         'chance' => null,         'experiment' => null,         'created' => null,         'modified' => null,         'status' => null,         'perm_id' => null,         'notes' => null,         'is_deleted' => null,         'answer_id' => null,         'parent_id' => null,         'order' => null     ) ) 

i dont' understand why casestudy array null because when @ record (id 77) in db data correct. doing wrong?

in example... question hasone casestudy; means question parent.

based on data, question has parent_id, i'm assuming mean casestudy parent , question child. looks association backwards (normally parent wouldn't have parent_id).

replace hasone association, belongsto instead:

public $belongsto = array(       'casestudy' => array('classname'=>'question', 'foreignkey'=>'parent_id') ); 

that ensure casestudy parent, , question child.

with way it's set up, cakephp trying casestudy has parent_id equal question.id; since don't have data in db cakephp finds nothing , returns null values. in reality, casestudy parent , question has parent_id equal casestudy.id