SELECT
rv.*,
GROUP_CONCAT(im.filename) AS images
FROM reviews rv
LEFT JOIN images im ON im.review_id = rv.id
/* В Management */
public static function findWithEmployees() {
$ret = new ManagementQuery(get_called_class());
$ret->addSelect( // и т.д.
return $ret;
}
$model = Management::findWithEmployees()->all();
/* в методе ManagementQuery::init() */
$this->addSelect(["employeesCount" => "COUNT(employees.*)"]);
$this->leftJoin([Employees::tableName()], ["employees.department_id" => "management.id"]);
/* …и т.д. что там надо */