Query Inside a redis model in yii2 - activerecord

Question

I have created a redis model, which should store statistics like this:
<?php
namespace app\models;
use Yii;
use yii\base\Model;
use \yii\redis\ActiveRecord;
use \yii\redis\ActiveQuery;
class StatsModel extends ActiveRecord
{
public function attributes()
{
return ['id', 'hits', 'user', 'ua', 'ip','os'];
}
public function rules()
{
return [
['user', 'required'],
['user','string'],
['ip', 'required'],
['ip', 'integer'],
['hits', 'integer'],
['ua','string'],
['os','integer']
];
}
public static function total_user_hits($username)
{
$query = new ActiveQuery($this);
$query->find()->where('user = '.$user)->all();
}
public static function getDb()
{
return \Yii::$app->db_redis;
}
}
Now, i'm trying to make a static function, which i can use, to count all thi hits value for specific user in redis. I'm creating an $query = new ActiveQuery($this); each time in the function, but can how can initiliase just one copy of the query to always use it? If i do it like class property:
public $query = new ActiveQuery($this);
I get error expression is not allowed as field default value

Answer 1

You should not reuse existing query object (unless you want to make query with the same conditions) - ActiveQuery is mutable, it means that previous queries may change its state:
$query = new ActiveQuery(StatsModel::class);
$result1 = $query->andWhere('user = 1')->all(); // 1 result
$result2 = $query->andWhere('user = 2')->all(); // no results
Second query will not return anything, since it will create condition like WHERE user = 1 AND user = 2 which is always false.
If you're afraid about performance, you should not. Creating ActiveQuery object has negligible overhead. Creating objects in PHP is relatively cheap and ActiveQuery is quite lightweight - the most time consuming thing will be actual query to redis/db.