find()->with(['category'])->orderBy(['position' => SORT_DESC])->all()
public function getCategory()
{
return $this->hasOne(NewsCategory::className(), ['id' => 'cat_id']);
}
'cat1' => [
1 => 'news_title1',
2 => 'In news_title2',
],
'cat2' => [
3 => 'news 3',
],