有一篇关于在CGridView中按相关模型进行搜索和排序的综合文章:http://www.yiiframework.com/wiki/281/searching-and-sorting-by-related-model-in-cgridview/我已多次成功实施此配方。
但是,现在我尝试按同一个表中的关系进行搜索和排序(它定义了parent_id)。请参阅下面的“父母”关系:
public function relations()
{
return array(
'parent' => array(self::BELONGS_TO, 'Category', 'parent_id'),
'children' => array(self::HAS_MANY, 'Category', 'parent_id'),
'childCount' => array(self::STAT, 'Category', 'parent_id'),
'author0' => array(self::BELONGS_TO, 'User', 'author'),
'contents' => array(self::MANY_MANY, 'Content', 'content_category(content_id, category_id)'),
'crsContents' => array(self::MANY_MANY, 'ContentCrs', 'content_category(content_id, category_id)'),
);
}
public function defaultScope()
{
return array(
'alias'=>'cat',
'order'=>"cat.name ASC",
);
}
当我实现wiki指定的方法时,我收到以下错误:
CDbCommand failed to execute the SQL statement: SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'cat'. The SQL statement executed was: SELECT COUNT(DISTINCT `cat`.`id`) FROM `category` `cat` LEFT OUTER JOIN `category` `cat` ON (`cat`.`parent_id`=`cat`.`id`) WHERE (cat.parent_id <> 257)
如何确保LEFT OUTER JOIN为关系使用唯一的表别名(例如parent
),以便我可以在CDbCriteria
中正确定义search()
修改:
根据@tereško的要求,这是我的search()函数。我知道它是有缺陷的,因为我没有定义它时指定的表别名parent
...我只是不知道如何!
public function search()
{
$criteria=new CDbCriteria;
$criteria->with = array('parent');
$criteria->compare('id',$this->id,true);
$criteria->compare('author',$this->author,true);
$criteria->compare('name',$this->name,true);
$criteria->compare('description',$this->description,true);
$criteria->compare('parent_id',$this->parent_id,true);
$criteria->compare('parent.name', $this->parent_search, true );
$criteria->compare('type',$this->type,true);
$criteria->compare('slug',$this->slug,true);
$criteria->compare('created',$this->created,true);
$criteria->compare('updated',$this->updated,true);
return new CActiveDataProvider($this, array(
'criteria'=>$criteria,
'sort'=>array(
'attributes'=>array(
'parent_search'=>array(
'asc'=>'parent.name',
'desc'=>'parent.name DESC',
),
'*',
),
),
)
);
}
答案 0 :(得分:2)
您可以为父关系提供别名,如下所示
$criteria->with = array(
'parent'=>array(
'alias'=>'parent'
)
);