Yii HAS_MANY與一些固定值

Question

我有兩個模型。批次和主題。它們之間的關係是批量HAS_MANY主題。問題是三個主題都必須和所有批次。我怎樣才能在模型中實現這個固定值（三個主題）？

Answer 1

如果你真的不想存儲在數據庫中的3個默認主題，你可以寫一個返回的默認主題與實際涉及到批處理對象的任何學科相結合的功能。

假設你的關係稱爲「主體」：

class Batch extends CActiveRecord 
{ 
    ... 
    public function getAllSubjects() 
    { 
    $subject1 = new Subject; 
    ... 
    $subject2 = new Subject; 
    ... 
    $subject3 = new Subject; 
    ... 
    return array($subject1, $subject2, $subject3) + $this->subjects; 
    } 

的限制是不能引用默認主題數據庫的標準，你必須確保使用的$model->allSubjects代替$model->subjects

Answer 2

使用自定義驗證器。這應該工作，雖然它沒有經過測試。

class RelatedObjAttrRangeValidator extends CValidator { 
    public $relationName; 
    public $relatedObjectAttributeName; 
    public $relatedObjectValues = array(); 

    public function validateAttribute($object, $attribute) { 
    if(!$this->relationName) { 
     $this->relationName = $attribute; 
    } 
    if(!$this->relatedObjectAttributeName || !count($this->relatedObjectValues)) { 
     throw new CException("Misconfigured Validator!"); 
    } 

    $relatedObjects = $object->getRelated($this->relationName); 
    if(is_array($relatedObjects)) { 
     $unmatched = array_values($this->relatedObjectValues); 
     $attr = $this->relatedObjectAttributeName; 
     foreach($relatedObjects as $relObj) { 
     $val = $relObj->$attr; 
     $idx = array_search($val, $unmatched); 
     if($idx !== -1) { 
      unset($unmatched[$idx]); 
     } 
     if(!count($unmatched)) { 
      break; 
     } 
     } 
     if(count($unmatched)) { 
     $object->addError($attribute, $this->message); 
     } 
    } else { 
     throw new CException(Yii::t('error', 'Relation {rel} in model {model} is not an array!', array(
     '{rel}' => $this->relationName, 
     '{model}' => get_class($model), 
    )); 
    } 
    } 
} 

class Batch extends CActiveRecord { 
    public function rules() { 
    return array(
     array('subjects', 'RelatedObjAttrRangeValidator', 
     'relatedObjectAttributeName' => 'ID', 
     'relatedObjectValues' => array("required_id_1", "required_id_2", "required_id_3"), 
     'message' => "One or more required Subjects are missing", 
    ); 
    } 
}