Yii2 ORDER BY用于ActiveRecord中的关系数据

Question

我的控制器中有一个查询:

$model = Object::find()->where(['id' => $id])->with(['backups'])->one();

getBackups是一个hasMany()关系,因此$ model返回几个"备份".

有没有办法订购'备份'？

我尝试了以下没有结果(或错误):

 $model = Object::find()
          ->where(['id' => $id])
          ->with(['backups' => function($query) { 
              $query->orderBy(['updated_at' => SORT_DESC]); 
          }])
          ->one();

Answer 1

您可以在Object模型声明排序关系backups有orderBy:

public function getSortedBackups()
  {

    return $this->hasMany(Backup::className(), ['object_id' => 'id'])->orderBy(['backups.updated_at'=>SORT_DESC]);
  }

输出这些备份时结束:

foreach($model->sortedBackups as $backup){
...
}