/**
 * Finds all users by assignment role
 *
 * @param  \yii\rbac\Role $role
 * @return static|null
 */
public static function findByRole($role)
{
    return static::find()
        ->join('LEFT JOIN','auth_assignment','auth_assignment.user_id = id')
        ->where(['auth_assignment.item_name' => $role->name])
        ->all();
}