yii2.0的自定义验证规则示例

在model的rule中 ：[['major','university_name','position'],'checkunique'],

public function checkunique($attribute, $params){
if(!$this->hasErrors()){
$data = (new yii\db\Query())
->select('id')
->from('wx_major_colleges')
->where(['major'=>$this->major])
->andWhere(['university_name'=>$this->university_name])
->andWhere(['position'=>$this->position])
->one();
if($data)
$this->addError ($attribute, "地区：".$this->position."，专业：".$this->major."，大学：".$this->university_name."，已经存在，请勿重复添加！");
}
}