Александр Зеленин

private function getDsnAttribute($name, $dsn)
    {
        if (preg_match('/' . $name . '=([^;]*)/', $dsn, $match)) {
            return $match[1];
        } else {
            return null;
        }
    }

$this->getDsnAttribute('dbname', Yii::$app->getDb()->dsn);

$this->getDsnAttribute('dbname', static::getDb()->dsn);

$this->getDsnAttribute('dbname', ModelName::getDb()->dsn);

$user = User::find()->with('userBookmarks', 'userBookmarks.films' )->all();

public function getCountComments($period = false) {

        $query = self::find();

        if($this->post_id) {
            $query->where(['post_id' => $this->post_id]);
        }

        if($this->type) {
            $query->andWhere(['type' => $this->type]);
        }

        if($period == 'day') {
            $query->andWhere('date_create>=CURDATE()');
        }

        return $query->count();
    }

<a href="/comments/default/vote" class="upvote">&nbsp;</a>

<script>
var ajax = {
voteUrl: '/comments/default/vote',
...
};
</script>

public function getCityList($cat_id) { // could be a static func as well
        $models = \common\models\City::find()->where(['country_id' => $cat_id])->asArray()->all();
        return ArrayHelper::map($models, 'id', 'name_ru','country_id');
       }