public function prepareSliderData()
{
$obj = new Slides();
$slides = $obj->bySliderId($this->sliderId, $this->lang_id);
// exit if slider not exist
if (empty($slides)) {
return null;
}
$this->slideDuration = $slides[0]['slider']['slide_duration'] ? $slides[0]['slider']['slide_duration'] : $this->slideDurationDefault;
$this->slides = $slides;
}
