php - Phalcon: How to get first model in 1-n relation -

i have following models

class post extends \phalcon\mvc\model {     ...     $this->hasmany('id', 'postmedia', 'parent_id'); }  class postmedia extends \phalcon\mvc\model {     ...     $this->belongsto('parent_id', 'post', 'id'); } 

to related entries following

post::find(1)->postmedia; 

but how first model? following code results in phalcon\mvc\model\resultset\simple object, need postmedia object.

post::find(1)->getpostmedia(['limit' => 1]); 

there getfirst(), getlast() , other useful methods in phalcon\mvc\model\resultset\simple class. there problem in code: post::find(1) returns resultset, not post object, correct code first related object this:

$first_media = post::findfirst(1)->postmedia->getfirst();