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100 lines
3.0 KiB
100 lines
3.0 KiB
<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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namespace yii\validators; |
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use Yii; |
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use yii\base\InvalidConfigException; |
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/** |
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* CUniqueValidator validates that the attribute value is unique in the corresponding database table. |
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* |
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* @author Qiang Xue <qiang.xue@gmail.com> |
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* @since 2.0 |
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*/ |
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class UniqueValidator extends Validator |
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{ |
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/** |
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* @var string the ActiveRecord class name or alias of the class |
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* that should be used to look for the attribute value being validated. |
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* Defaults to null, meaning using the ActiveRecord class of the attribute being validated. |
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* @see attributeName |
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*/ |
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public $className; |
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/** |
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* @var string the ActiveRecord class attribute name that should be |
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* used to look for the attribute value being validated. Defaults to null, |
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* meaning using the name of the attribute being validated. |
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*/ |
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public $attributeName; |
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/** |
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* Initializes the validator. |
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*/ |
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public function init() |
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{ |
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parent::init(); |
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if ($this->message === null) { |
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$this->message = Yii::t('yii', '{attribute} "{value}" has already been taken.'); |
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} |
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} |
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/** |
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* Validates the attribute of the object. |
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* If there is any error, the error message is added to the object. |
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* @param \yii\db\ActiveRecord $object the object being validated |
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* @param string $attribute the attribute being validated |
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* @throws InvalidConfigException if table doesn't have column specified |
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*/ |
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public function validateAttribute($object, $attribute) |
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{ |
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$value = $object->$attribute; |
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if (is_array($value)) { |
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$this->addError($object, $attribute, Yii::t('yii', '{attribute} is invalid.')); |
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return; |
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} |
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/** @var $className \yii\db\ActiveRecord */ |
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$className = $this->className === null ? get_class($object) : Yii::import($this->className); |
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$attributeName = $this->attributeName === null ? $attribute : $this->attributeName; |
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$table = $className::getTableSchema(); |
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if (($column = $table->getColumn($attributeName)) === null) { |
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throw new InvalidConfigException("Table '{$table->name}' does not have a column named '$attributeName'."); |
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} |
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$query = $className::find(); |
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$query->where(array($column->name => $value)); |
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if ($object->getIsNewRecord()) { |
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// if current $object isn't in the database yet then it's OK just to call exists() |
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$exists = $query->exists(); |
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} else { |
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// if current $object is in the database already we can't use exists() |
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$query->limit(2); |
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$objects = $query->all(); |
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$n = count($objects); |
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if ($n === 1) { |
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if ($column->isPrimaryKey) { |
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// primary key is modified and not unique |
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$exists = $object->getOldPrimaryKey() != $object->getPrimaryKey(); |
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} else { |
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// non-primary key, need to exclude the current record based on PK |
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$exists = array_shift($objects)->getPrimaryKey() != $object->getOldPrimaryKey(); |
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} |
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} else { |
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$exists = $n > 1; |
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} |
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} |
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if ($exists) { |
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$this->addError($object, $attribute, $this->message); |
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} |
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} |
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}
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