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CUniqueValidator.php
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CUniqueValidator.php
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<?php
/**
* CUniqueValidator class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CUniqueValidator validates that the attribute value is unique in the corresponding database table.
*
* CUniqueValidator can only be used for active record objects.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.validators
* @since 1.0
*/
class CUniqueValidator extends CValidator
{
/**
* @var boolean whether the comparison is case sensitive. Defaults to true.
* Note, by setting it to false, you are assuming the attribute type is string.
*/
public $caseSensitive=true;
/**
* @var boolean whether the attribute value can be null or empty. Defaults to true,
* meaning that if the attribute is empty, it is considered valid.
*/
public $allowEmpty=true;
/**
* Validates the attribute of the object.
* If there is any error, the error message is added to the object.
* @param CModel the object being validated
* @param string the attribute being validated
*/
protected function validateAttribute($object,$attribute)
{
$value=$object->$attribute;
if($this->allowEmpty && ($value===null || $value===''))
return;
$column=$object->getTableSchema()->getColumn($attribute);
if($column===null)
throw new CException(Yii::t('yii','{class} does not have attribute "{attribute}".',
array('{class}'=>get_class($object), '{attribute}'=>$attribute)));
$columnName=$column->rawName;
$criteria=array(
'condition'=>$this->caseSensitive ? "$columnName=:value" : "LOWER($columnName)=LOWER(:value)",
'params'=>array(':value'=>$value),
);
if($column->isPrimaryKey)
$exists=$object->exists($criteria);
else
{
// need to exclude the current record based on PK
$criteria['limit']=2;
$objects=CActiveRecord::model(get_class($object))->findAll($criteria);
$n=count($objects);
if($n===1)
$exists=$objects[0]->getPrimaryKey()!=$object->getPrimaryKey();
else
$exists=$n>1;
}
if($exists)
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} "{value}" has already been taken.');
$this->addError($object,$attribute,$message,array('{value}'=>$value));
}
}
}