/**
* 查询所有部门，返回object，缓存两小时、依赖部门数量变化
* @return \common\models\Department[]
*/
public static function findAllForObject()
{
$dependency = new DbDependency(['sql' => 'select count(*) from department']);
$result = Department::getDb()->cache(function () {
return Department::find()->all();
}, 2 * 3600, $dependency);
return $result;
}
