How to get database name in YII2?

Question

Yii

I need to raise a migration to create a table.
The table will have a field that will be a foreign key to a field from another database.
I fixed database1.fieldit and everything worked.
But I need dynamic.
From model i can get table name
common\models\GoogleGroups::tableName();
but how to get database name from model?

Answer 1

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

Usage anywhere:
Usage in the model:
then push the function into some helper, but if you write a migration, then why do you need a model?
In migration:
$this->getDsnAttribute('dbname', $this->db->dsn);