I don't know why I cannot use the function getComments(), for one item has many comments. with the item id, I want all the comments of the id
bug:The method "getComments" doesn't exist on model "Items"...
Here is the nearly whole models, and the main part of the api
Comments.php
    <?php
    class Comments extends \Phalcon\Mvc\Model
    {
    /**
    * @var integer
    */
    public $id;
    /**
    * @var integer
    */
    public $item_id;
    public function initialize()
    {
    $this->belongsTo("item_id", "Items", "id");
    }
}Items.php
<?php
    class Items extends \Phalcon\Mvc\Model
    {   
    /**
    * @var integer
    */
    public $id;
    public function initialize()
    {
    $this->hasMany("id", "Comments", "item_id");   
    }
     /**
     * Return the related "comments"
     *
     * @return \Comments[]
     */
    public function getComments()
    {
    return $this->getRelated('Comments', null);
    }
}api.php
<?php
     use Phalcon\Mvc\Model;
    $application->get('/items/{id:[0-9]+}',function($id)use($application){ 
    $comments=$items->getComments();
    $data = array();
    foreach ($comments as $comment) {
    $data[] = array(
        'commentid' => $comment->id,
        'text' => $comment->text,
        'time_create' => $comment->time_create,
        'nick_name' =>$comment->nick_name
    );
    } 
    echo json_encode($data);
}