Yii2, how to specify the use of another DB in the model?

Question

Yii

you need to use a different database for a particular model.
in the komon in the main.php file I added a new database connection

'components' => [
    'db2' => [
        'class' => '\yii\db\Connection',
        // ...
    ],
]

Now the question is how to tell the model to use a db2 connection.
I was advised something like this:

class Post extends ActiveRecord
{
    public static function getDb()
    {
        return $this->db2;
    }
}

But the problem is that Yii2 scolds $this->db2 for not being there.
I tried a couple more options with self and through Yii::$app
But I still couldn’t agree with the model. Can you please tell me how to explain the model so that it works with db2?

Answer 1

return \Yii::$app->get('db2');

Answer 2

According to the idea, you were correctly prompted to override the method for the AR model.
Try return Yii::$app->getComponent('db2');
or so return Yii::$app->db2;

Answer 3

I'll update Yii2 now and give it a try.
I just tried Yii::$app->db2 like this , it didn't work.