Block::relations PHP Method

    public function relations()
    {
        // NOTE: you may need to adjust the relation name and the related
        // class name for the relations automatically generated below.
        return array();
    }

 public function relations()
 {
     return array_merge(parent::relations(), array('entity' => array(self::BELONGS_TO, self::TYPE_OF_BLOCK, 'entity_id')));
 }