diff --git a/framework/validators/BooleanValidator.php b/framework/validators/BooleanValidator.php
index 46b8663..087e746 100644
--- a/framework/validators/BooleanValidator.php
+++ b/framework/validators/BooleanValidator.php
@@ -54,7 +54,7 @@ class BooleanValidator extends Validator
 		}
 		if (!$this->strict && $value != $this->trueValue && $value != $this->falseValue
 				|| $this->strict && $value !== $this->trueValue && $value !== $this->falseValue) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be either {true} or {false}.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be either {true} or {false}.');
 			$this->addError($object, $attribute, $message, array(
 				'{true}' => $this->trueValue,
 				'{false}' => $this->falseValue,
@@ -70,7 +70,7 @@ class BooleanValidator extends Validator
 	 */
 	public function clientValidateAttribute($object, $attribute)
 	{
-		$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be either {true} or {false}.');
+		$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be either {true} or {false}.');
 		$message = strtr($message, array(
 			'{attribute}' => $object->getAttributeLabel($attribute),
 			'{value}' => $object->$attribute,
diff --git a/framework/validators/CaptchaValidator.php b/framework/validators/CaptchaValidator.php
index 2bd8e9a..9fdf3fb 100644
--- a/framework/validators/CaptchaValidator.php
+++ b/framework/validators/CaptchaValidator.php
@@ -49,7 +49,7 @@ class CaptchaValidator extends Validator
 		}
 		$captcha = $this->getCaptchaAction();
 		if (!$captcha->validate($value, $this->caseSensitive)) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', 'The verification code is incorrect.');
+			$message = $this->message !== null ? $this->message : \Yii::t('yii', 'The verification code is incorrect.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
@@ -85,7 +85,7 @@ class CaptchaValidator extends Validator
 	public function clientValidateAttribute($object, $attribute)
 	{
 		$captcha = $this->getCaptchaAction();
-		$message = $this->message !== null ? $this->message : Yii::t('yii', 'The verification code is incorrect.');
+		$message = $this->message !== null ? $this->message : \Yii::t('yii', 'The verification code is incorrect.');
 		$message = strtr($message, array(
 			'{attribute}' => $object->getAttributeLabel($attribute),
 			'{value}' => $object->$attribute,
diff --git a/framework/validators/CompareValidator.php b/framework/validators/CompareValidator.php
index 97febb5..08f230c 100644
--- a/framework/validators/CompareValidator.php
+++ b/framework/validators/CompareValidator.php
@@ -68,6 +68,7 @@ class CompareValidator extends Validator
 	 * If there is any error, the error message is added to the object.
 	 * @param \yii\base\Model $object the object being validated
 	 * @param string $attribute the attribute being validated
+	 * @throws \yii\base\Exception if CompareValidator::operator is invalid
 	 */
 	public function validateAttribute($object, $attribute)
 	{
@@ -78,7 +79,7 @@ class CompareValidator extends Validator
 		if ($this->compareValue !== null) {
 			$compareTo = $compareValue = $this->compareValue;
 		} else {
-			$compareAttribute = $this->compareAttribute === null ? $attribute . '_repeat' : $this->compareAttribute;
+			$compareAttribute = ($this->compareAttribute === null) ? $attribute . '_repeat' : $this->compareAttribute;
 			$compareValue = $object->$compareAttribute;
 			$compareTo = $object->getAttributeLabel($compareAttribute);
 		}
@@ -87,37 +88,37 @@ class CompareValidator extends Validator
 			case '=':
 			case '==':
 				if (($this->strict && $value !== $compareValue) || (!$this->strict && $value != $compareValue)) {
-					$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be repeated exactly.');
+					$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be repeated exactly.');
 					$this->addError($object, $attribute, $message, array('{compareAttribute}' => $compareTo));
 				}
 				break;
 			case '!=':
 				if (($this->strict && $value === $compareValue) || (!$this->strict && $value == $compareValue)) {
-					$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must not be equal to "{compareValue}".');
+					$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must not be equal to "{compareValue}".');
 					$this->addError($object, $attribute, $message, array('{compareAttribute}' => $compareTo, '{compareValue}' => $compareValue));
 				}
 				break;
 			case '>':
 				if ($value <= $compareValue) {
-					$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be greater than "{compareValue}".');
+					$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be greater than "{compareValue}".');
 					$this->addError($object, $attribute, $message, array('{compareAttribute}' => $compareTo, '{compareValue}' => $compareValue));
 				}
 				break;
 			case '>=':
 				if ($value < $compareValue) {
-					$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be greater than or equal to "{compareValue}".');
+					$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be greater than or equal to "{compareValue}".');
 					$this->addError($object, $attribute, $message, array('{compareAttribute}' => $compareTo, '{compareValue}' => $compareValue));
 				}
 				break;
 			case '<':
 				if ($value >= $compareValue) {
-					$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be less than "{compareValue}".');
+					$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be less than "{compareValue}".');
 					$this->addError($object, $attribute, $message, array('{compareAttribute}' => $compareTo, '{compareValue}' => $compareValue));
 				}
 				break;
 			case '<=':
 				if ($value > $compareValue) {
-					$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be less than or equal to "{compareValue}".');
+					$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be less than or equal to "{compareValue}".');
 					$this->addError($object, $attribute, $message, array('{compareAttribute}' => $compareTo, '{compareValue}' => $compareValue));
 				}
 				break;
@@ -129,8 +130,9 @@ class CompareValidator extends Validator
 	/**
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
-	 * @param string $attribute the name of the attribute to be validated.
-	 * @return string the client-side validation script.
+	 * @param string $attribute the name of the attribute to be validated
+	 * @return string the client-side validation script
+	 * @throws \yii\base\Exception if CompareValidator::operator is invalid
 	 */
 	public function clientValidateAttribute($object, $attribute)
 	{
@@ -138,7 +140,7 @@ class CompareValidator extends Validator
 			$compareTo = $this->compareValue;
 			$compareValue = json_encode($this->compareValue);
 		} else {
-			$compareAttribute = $this->compareAttribute === null ? $attribute . '_repeat' : $this->compareAttribute;
+			$compareAttribute = ($this->compareAttribute === null) ? $attribute . '_repeat' : $this->compareAttribute;
 			$compareValue = "\$('#" . (CHtml::activeId($object, $compareAttribute)) . "').val()";
 			$compareTo = $object->getAttributeLabel($compareAttribute);
 		}
@@ -148,37 +150,37 @@ class CompareValidator extends Validator
 			case '=':
 			case '==':
 				if ($message === null) {
-					$message = Yii::t('yii', '{attribute} must be repeated exactly.');
+					$message = \Yii::t('yii', '{attribute} must be repeated exactly.');
 				}
 				$condition = 'value!=' . $compareValue;
 				break;
 			case '!=':
 				if ($message === null) {
-					$message = Yii::t('yii', '{attribute} must not be equal to "{compareValue}".');
+					$message = \Yii::t('yii', '{attribute} must not be equal to "{compareValue}".');
 				}
 				$condition = 'value==' . $compareValue;
 				break;
 			case '>':
 				if ($message === null) {
-					$message = Yii::t('yii', '{attribute} must be greater than "{compareValue}".');
+					$message = \Yii::t('yii', '{attribute} must be greater than "{compareValue}".');
 				}
 				$condition = 'value<=' . $compareValue;
 				break;
 			case '>=':
 				if ($message === null) {
-					$message = Yii::t('yii', '{attribute} must be greater than or equal to "{compareValue}".');
+					$message = \Yii::t('yii', '{attribute} must be greater than or equal to "{compareValue}".');
 				}
 				$condition = 'value<' . $compareValue;
 				break;
 			case '<':
 				if ($message === null) {
-					$message = Yii::t('yii', '{attribute} must be less than "{compareValue}".');
+					$message = \Yii::t('yii', '{attribute} must be less than "{compareValue}".');
 				}
 				$condition = 'value>=' . $compareValue;
 				break;
 			case '<=':
 				if ($message === null) {
-					$message = Yii::t('yii', '{attribute} must be less than or equal to "{compareValue}".');
+					$message = \Yii::t('yii', '{attribute} must be less than or equal to "{compareValue}".');
 				}
 				$condition = 'value>' . $compareValue;
 				break;
diff --git a/framework/validators/DateValidator.php b/framework/validators/DateValidator.php
index f3309f2..7a352f1 100644
--- a/framework/validators/DateValidator.php
+++ b/framework/validators/DateValidator.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * CDateValidator class file.
+ * DateValidator class file.
  *
  * @link http://www.yiiframework.com/
  * @copyright Copyright &copy; 2008-2012 Yii Software LLC
@@ -10,7 +10,7 @@
 namespace yii\validators;
 
 /**
- * CDateValidator verifies if the attribute represents a date, time or datetime.
+ * DateValidator verifies if the attribute represents a date, time or datetime.
  *
  * By setting the {@link format} property, one can specify what format the date value
  * must be in. If the given date value doesn't follow the format, the attribute is considered as invalid.
@@ -18,7 +18,7 @@ namespace yii\validators;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class CDateValidator extends Validator
+class DateValidator extends Validator
 {
 	/**
 	 * @var mixed the format pattern that the date value should follow.
@@ -48,26 +48,25 @@ class CDateValidator extends Validator
 	public function validateAttribute($object, $attribute)
 	{
 		$value = $object->$attribute;
-		if ($this->allowEmpty && $this->isEmpty($value))
+		if ($this->allowEmpty && $this->isEmpty($value)) {
 			return;
+		}
 
 		$formats = is_string($this->format) ? array($this->format) : $this->format;
 		$valid = false;
-		foreach ($formats as $format)
-		{
+		foreach ($formats as $format) {
 			$timestamp = CDateTimeParser::parse($value, $format, array('month' => 1, 'day' => 1, 'hour' => 0, 'minute' => 0, 'second' => 0));
-			if ($timestamp !== false)
-			{
+			if ($timestamp !== false) {
 				$valid = true;
-				if ($this->timestampAttribute !== null)
+				if ($this->timestampAttribute !== null) {
 					$object-> {$this->timestampAttribute} = $timestamp;
+				}
 				break;
 			}
 		}
 
-		if (!$valid)
-		{
-			$message = $this->message !== null ? $this->message : Yii::t('yii', 'The format of {attribute} is invalid.');
+		if (!$valid) {
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', 'The format of {attribute} is invalid.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
diff --git a/framework/validators/EmailValidator.php b/framework/validators/EmailValidator.php
index 41d0d38..c316c61 100644
--- a/framework/validators/EmailValidator.php
+++ b/framework/validators/EmailValidator.php
@@ -63,7 +63,7 @@ class EmailValidator extends Validator
 			return;
 		}
 		if (!$this->validateValue($value)) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is not a valid email address.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} is not a valid email address.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
@@ -99,7 +99,7 @@ class EmailValidator extends Validator
 	 */
 	public function clientValidateAttribute($object, $attribute)
 	{
-		$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is not a valid email address.');
+		$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} is not a valid email address.');
 		$message = strtr($message, array(
 			'{attribute}' => $object->getAttributeLabel($attribute),
 			'{value}' => $object->$attribute,
diff --git a/framework/validators/ExistValidator.php b/framework/validators/ExistValidator.php
index 10f4e82..9ef86ff 100644
--- a/framework/validators/ExistValidator.php
+++ b/framework/validators/ExistValidator.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * CExistValidator class file.
+ * ExistValidator class file.
  *
  * @link http://www.yiiframework.com/
  * @copyright Copyright &copy; 2008-2012 Yii Software LLC
@@ -10,7 +10,7 @@
 namespace yii\validators;
 
 /**
- * CExistValidator validates that the attribute value exists in a table.
+ * ExistValidator validates that the attribute value exists in a table.
  *
  * This validator is often used to verify that a foreign key contains a value
  * that can be found in the foreign table.
@@ -18,29 +18,29 @@ namespace yii\validators;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class CExistValidator extends Validator
+class ExistValidator extends Validator
 {
 	/**
-	 * @var string the ActiveRecord class name that should be used to
-	 * look for the attribute value being validated. Defaults to null,
-	 * meaning using the ActiveRecord class of the attribute being validated.
-	 * You may use path alias to reference a class name here.
+	 * @var string the yii\db\ar\ActiveRecord class name or alias of the class
+	 * that should be used to look for the attribute value being validated.
+	 * Defaults to null, meaning using the yii\db\ar\ActiveRecord class of
+	 * the attribute being validated.
 	 * @see attributeName
 	 */
 	public $className;
 	/**
-	 * @var string the ActiveRecord class attribute name that should be
+	 * @var string the yii\db\ar\ActiveRecord class attribute name that should be
 	 * used to look for the attribute value being validated. Defaults to null,
 	 * meaning using the name of the attribute being validated.
 	 * @see className
 	 */
 	public $attributeName;
 	/**
-	 * @var array additional query criteria. This will be combined with the condition
-	 * that checks if the attribute value exists in the corresponding table column.
-	 * This array will be used to instantiate a {@link CDbCriteria} object.
+	 * @var \yii\db\dao\BaseQuery additional query criteria. This will be combined
+	 * with the condition that checks if the attribute value exists in the
+	 * corresponding table column.
 	 */
-	public $criteria = array();
+	public $query = null;
 	/**
 	 * @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.
@@ -50,33 +50,34 @@ class CExistValidator extends Validator
 	/**
 	 * Validates the attribute of the object.
 	 * If there is any error, the error message is added to the object.
-	 * @param \yii\base\Model $object the object being validated
+	 *
+	 * @param \yii\db\ar\ActiveRecord $object the object being validated
 	 * @param string $attribute the attribute being validated
+	 *
+	 * @throws \yii\base\Exception if table doesn't have column specified
 	 */
 	public function validateAttribute($object, $attribute)
 	{
 		$value = $object->$attribute;
-		if ($this->allowEmpty && $this->isEmpty($value))
+		if ($this->allowEmpty && $this->isEmpty($value)) {
 			return;
+		}
+
+		$className = ($this->className === null) ? get_class($object) : \Yii::import($this->className);
+		$attributeName = ($this->attributeName === null) ? $attribute : $this->attributeName;
+		$table = $object::getMetaData()->table;
+		if (($column = $table->getColumn($attributeName)) === null) {
+			throw new \yii\base\Exception('Table "' . $table->name . '" does not have a column named "' . $attributeName . '"');
+		}
 
-		$className = $this->className === null ? get_class($object) : Yii::import($this->className);
-		$attributeName = $this->attributeName === null ? $attribute : $this->attributeName;
-		$finder = CActiveRecord::model($className);
-		$table = $finder->getTableSchema();
-		if (($column = $table->getColumn($attributeName)) === null)
-			throw new CException(Yii::t('yii', 'Table "{table}" does not have a column named "{column}".',
-				array('{column}' => $attributeName, '{table}' => $table->name)));
+		$finder = $object->find()->where(array($column->name => $value));
 
-		$criteria = array('condition' => $column->rawName . '=:vp', 'params' => array(':vp' => $value));
-		if ($this->criteria !== array())
-		{
-			$criteria = new CDbCriteria($criteria);
-			$criteria->mergeWith($this->criteria);
+		if ($this->query instanceof \yii\db\dao\BaseQuery) {
+			$finder->mergeWith($this->query);
 		}
 
-		if (!$finder->exists($criteria))
-		{
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} "{value}" is invalid.');
+		if (!$finder->exists()) {
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} "{value}" is invalid.');
 			$this->addError($object, $attribute, $message, array('{value}' => $value));
 		}
 	}
diff --git a/framework/validators/FileValidator.php b/framework/validators/FileValidator.php
index a1ce299..fec253b 100644
--- a/framework/validators/FileValidator.php
+++ b/framework/validators/FileValidator.php
@@ -115,7 +115,7 @@ class CFileValidator extends Validator
 				return $this->emptyAttribute($object, $attribute);
 			if (count($files) > $this->maxFiles)
 			{
-				$message = $this->tooMany !== null ? $this->tooMany : Yii::t('yii', '{attribute} cannot accept more than {limit} files.');
+				$message = $this->tooMany !== null ? $this->tooMany : \Yii::t('yii', '{attribute} cannot accept more than {limit} files.');
 				$this->addError($object, $attribute, $message, array('{attribute}' => $attribute, '{limit}' => $this->maxFiles));
 			} else
 				foreach ($files as $file)
@@ -145,20 +145,20 @@ class CFileValidator extends Validator
 			return $this->emptyAttribute($object, $attribute);
 		elseif ($error == UPLOAD_ERR_INI_SIZE || $error == UPLOAD_ERR_FORM_SIZE || $this->maxSize !== null && $file->getSize() > $this->maxSize)
 		{
-			$message = $this->tooLarge !== null ? $this->tooLarge : Yii::t('yii', 'The file "{file}" is too large. Its size cannot exceed {limit} bytes.');
+			$message = $this->tooLarge !== null ? $this->tooLarge : \Yii::t('yii', 'The file "{file}" is too large. Its size cannot exceed {limit} bytes.');
 			$this->addError($object, $attribute, $message, array('{file}' => $file->getName(), '{limit}' => $this->getSizeLimit()));
 		} elseif ($error == UPLOAD_ERR_PARTIAL)
-			throw new CException(Yii::t('yii', 'The file "{file}" was only partially uploaded.', array('{file}' => $file->getName())));
+			throw new CException(\Yii::t('yii', 'The file "{file}" was only partially uploaded.', array('{file}' => $file->getName())));
 		elseif ($error == UPLOAD_ERR_NO_TMP_DIR)
-			throw new CException(Yii::t('yii', 'Missing the temporary folder to store the uploaded file "{file}".', array('{file}' => $file->getName())));
+			throw new CException(\Yii::t('yii', 'Missing the temporary folder to store the uploaded file "{file}".', array('{file}' => $file->getName())));
 		elseif ($error == UPLOAD_ERR_CANT_WRITE)
-			throw new CException(Yii::t('yii', 'Failed to write the uploaded file "{file}" to disk.', array('{file}' => $file->getName())));
+			throw new CException(\Yii::t('yii', 'Failed to write the uploaded file "{file}" to disk.', array('{file}' => $file->getName())));
 		elseif (defined('UPLOAD_ERR_EXTENSION') && $error == UPLOAD_ERR_EXTENSION)  // available for PHP 5.2.0 or above
-			throw new CException(Yii::t('yii', 'File upload was stopped by extension.'));
+			throw new CException(\Yii::t('yii', 'File upload was stopped by extension.'));
 
 		if ($this->minSize !== null && $file->getSize() < $this->minSize)
 		{
-			$message = $this->tooSmall !== null ? $this->tooSmall : Yii::t('yii', 'The file "{file}" is too small. Its size cannot be smaller than {limit} bytes.');
+			$message = $this->tooSmall !== null ? $this->tooSmall : \Yii::t('yii', 'The file "{file}" is too small. Its size cannot be smaller than {limit} bytes.');
 			$this->addError($object, $attribute, $message, array('{file}' => $file->getName(), '{limit}' => $this->minSize));
 		}
 
@@ -170,7 +170,7 @@ class CFileValidator extends Validator
 				$types = $this->types;
 			if (!in_array(strtolower($file->getExtensionName()), $types))
 			{
-				$message = $this->wrongType !== null ? $this->wrongType : Yii::t('yii', 'The file "{file}" cannot be uploaded. Only files with these extensions are allowed: {extensions}.');
+				$message = $this->wrongType !== null ? $this->wrongType : \Yii::t('yii', 'The file "{file}" cannot be uploaded. Only files with these extensions are allowed: {extensions}.');
 				$this->addError($object, $attribute, $message, array('{file}' => $file->getName(), '{extensions}' => implode(', ', $types)));
 			}
 		}
@@ -185,7 +185,7 @@ class CFileValidator extends Validator
 	{
 		if (!$this->allowEmpty)
 		{
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} cannot be blank.');
+			$message = $this->message !== null ? $this->message : \Yii::t('yii', '{attribute} cannot be blank.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
diff --git a/framework/validators/FilterValidator.php b/framework/validators/FilterValidator.php
index ac49c9d..88b20b9 100644
--- a/framework/validators/FilterValidator.php
+++ b/framework/validators/FilterValidator.php
@@ -45,6 +45,7 @@ class FilterValidator extends Validator
 	 * If there is any error, the error message is added to the object.
 	 * @param \yii\base\Model $object the object being validated
 	 * @param string $attribute the attribute being validated
+	 * @throws \yii\base\Exception if filter property is not a valid callback
 	 */
 	public function validateAttribute($object, $attribute)
 	{
diff --git a/framework/validators/InlineValidator.php b/framework/validators/InlineValidator.php
index e942d49..32dfb45 100644
--- a/framework/validators/InlineValidator.php
+++ b/framework/validators/InlineValidator.php
@@ -27,7 +27,8 @@ namespace yii\validators;
 class InlineValidator extends Validator
 {
 	/**
-	 * @var string the name of the validation method defined in the active record class
+	 * @var string the name of the validation method defined in the
+	 * \yii\base\Model class
 	 */
 	public $method;
 	/**
@@ -81,9 +82,9 @@ class InlineValidator extends Validator
 	 */
 	public function clientValidateAttribute($object, $attribute)
 	{
-		if($this->clientValidate !== null) {
+		if ($this->clientValidate !== null) {
 			$method = $this->clientValidate;
 			return $object->$method($attribute);
 		}
 	}
-}
+}
\ No newline at end of file
diff --git a/framework/validators/IntegerValidator.php b/framework/validators/IntegerValidator.php
index fcf33c1..b497af7 100644
--- a/framework/validators/IntegerValidator.php
+++ b/framework/validators/IntegerValidator.php
@@ -31,7 +31,7 @@ class IntegerValidator extends NumberValidator
 	public function validateAttribute($object, $attribute)
 	{
 		if ($this->message === null) {
-			$this->message = Yii::t('yii', '{attribute} must be an integer.');
+			$this->message = \Yii::t('yii', '{attribute} must be an integer.');
 		}
 		parent::validateAttribute($object, $attribute);
 	}
@@ -45,7 +45,7 @@ class IntegerValidator extends NumberValidator
 	public function clientValidateAttribute($object, $attribute)
 	{
 		if ($this->message === null) {
-			$this->message = Yii::t('yii', '{attribute} must be an integer.');
+			$this->message = \Yii::t('yii', '{attribute} must be an integer.');
 		}
 		return parent::clientValidateAttribute($object, $attribute);
 	}
diff --git a/framework/validators/NumberValidator.php b/framework/validators/NumberValidator.php
index 25e5434..de71b31 100644
--- a/framework/validators/NumberValidator.php
+++ b/framework/validators/NumberValidator.php
@@ -62,15 +62,15 @@ class NumberValidator extends Validator
 			return;
 		}
 		if (!preg_match($this->pattern, "$value")) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be a number.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be a number.');
 			$this->addError($object, $attribute, $message);
 		}
 		if ($this->min !== null && $value < $this->min) {
-			$message = $this->tooSmall !== null ? $this->tooSmall : Yii::t('yii', '{attribute} is too small (minimum is {min}).');
+			$message = ($this->tooSmall !== null) ? $this->tooSmall : \Yii::t('yii', '{attribute} is too small (minimum is {min}).');
 			$this->addError($object, $attribute, $message, array('{min}' => $this->min));
 		}
 		if ($this->max !== null && $value > $this->max) {
-			$message = $this->tooBig !== null ? $this->tooBig : Yii::t('yii', '{attribute} is too big (maximum is {max}).');
+			$message = ($this->tooBig !== null) ? $this->tooBig : \Yii::t('yii', '{attribute} is too big (maximum is {max}).');
 			$this->addError($object, $attribute, $message, array('{max}' => $this->max));
 		}
 	}
@@ -87,7 +87,7 @@ class NumberValidator extends Validator
 		$value = $object->$attribute;
 
 		if (($message = $this->message) === null) {
-			$message = Yii::t('yii', '{attribute} must be a number.');
+			$message = \Yii::t('yii', '{attribute} must be a number.');
 		}
 		$message = strtr($message, array(
 			'{attribute}' => $label,
@@ -95,7 +95,7 @@ class NumberValidator extends Validator
 		));
 
 		if (($tooBig = $this->tooBig) === null) {
-			$tooBig = Yii::t('yii', '{attribute} is too big (maximum is {max}).');
+			$tooBig = \Yii::t('yii', '{attribute} is too big (maximum is {max}).');
 		}
 		$tooBig = strtr($tooBig, array(
 			'{attribute}' => $label,
@@ -104,7 +104,7 @@ class NumberValidator extends Validator
 		));
 
 		if (($tooSmall = $this->tooSmall) === null) {
-			$tooSmall = Yii::t('yii', '{attribute} is too small (minimum is {min}).');
+			$tooSmall = \Yii::t('yii', '{attribute} is too small (minimum is {min}).');
 		}
 		$tooSmall = strtr($tooSmall, array(
 			'{attribute}' => $label,
diff --git a/framework/validators/RangeValidator.php b/framework/validators/RangeValidator.php
index ab04dbb..662c08d 100644
--- a/framework/validators/RangeValidator.php
+++ b/framework/validators/RangeValidator.php
@@ -45,6 +45,7 @@ class RangeValidator extends Validator
 	 * If there is any error, the error message is added to the object.
 	 * @param \yii\base\Model $object the object being validated
 	 * @param string $attribute the attribute being validated
+	 * @throws \yii\base\Exception if the "range" property is not an array
 	 */
 	public function validateAttribute($object, $attribute)
 	{
@@ -56,10 +57,10 @@ class RangeValidator extends Validator
 			throw new \yii\base\Exception('The "range" property must be specified as an array.');
 		}
 		if (!$this->not && !in_array($value, $this->range, $this->strict)) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} should be in the list.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} should be in the list.');
 			$this->addError($object, $attribute, $message);
 		} elseif ($this->not && in_array($value, $this->range, $this->strict)) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} should NOT be in the list.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} should NOT be in the list.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
@@ -69,6 +70,7 @@ class RangeValidator extends Validator
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
 	 * @return string the client-side validation script.
+	 * @throws \yii\base\Exception if the "range" property is not an array
 	 */
 	public function clientValidateAttribute($object, $attribute)
 	{
@@ -77,7 +79,7 @@ class RangeValidator extends Validator
 		}
 
 		if (($message = $this->message) === null) {
-			$message = $this->not ? Yii::t('yii', '{attribute} should NOT be in the list.') : Yii::t('yii', '{attribute} should be in the list.');
+			$message = $this->not ? \Yii::t('yii', '{attribute} should NOT be in the list.') : \Yii::t('yii', '{attribute} should be in the list.');
 		}
 		$message = strtr($message, array(
 			'{attribute}' => $object->getAttributeLabel($attribute),
diff --git a/framework/validators/RegularExpressionValidator.php b/framework/validators/RegularExpressionValidator.php
index a1630ab..26d1392 100644
--- a/framework/validators/RegularExpressionValidator.php
+++ b/framework/validators/RegularExpressionValidator.php
@@ -39,6 +39,7 @@ class RegularExpressionValidator extends Validator
 	 * If there is any error, the error message is added to the object.
 	 * @param \yii\base\Model $object the object being validated
 	 * @param string $attribute the attribute being validated
+	 * @throws \yii\base\Exception if the "pattern" is not a valid regular expression
 	 */
 	public function validateAttribute($object, $attribute)
 	{
@@ -47,10 +48,10 @@ class RegularExpressionValidator extends Validator
 			return;
 		}
 		if ($this->pattern === null) {
-			throw new \yii\base\Exception(Yii::t('yii', 'The "pattern" property must be specified with a valid regular expression.'));
+			throw new \yii\base\Exception('The "pattern" property must be specified with a valid regular expression.');
 		}
 		if ((!$this->not && !preg_match($this->pattern, $value)) || ($this->not && preg_match($this->pattern, $value))) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is invalid.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} is invalid.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
@@ -60,6 +61,7 @@ class RegularExpressionValidator extends Validator
 	 * @param \yii\base\Model $object the data object being validated
 	 * @param string $attribute the name of the attribute to be validated.
 	 * @return string the client-side validation script.
+	 * @throws \yii\base\Exception if the "pattern" is not a valid regular expression
 	 */
 	public function clientValidateAttribute($object, $attribute)
 	{
@@ -67,7 +69,7 @@ class RegularExpressionValidator extends Validator
 			throw new \yii\base\Exception('The "pattern" property must be specified with a valid regular expression.');
 		}
 
-		$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is invalid.');
+		$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} is invalid.');
 		$message = strtr($message, array(
 			'{attribute}' => $object->getAttributeLabel($attribute),
 			'{value}' => $object->$attribute,
diff --git a/framework/validators/RequiredValidator.php b/framework/validators/RequiredValidator.php
index 60677f6..c7f294c 100644
--- a/framework/validators/RequiredValidator.php
+++ b/framework/validators/RequiredValidator.php
@@ -47,12 +47,12 @@ class RequiredValidator extends Validator
 		$value = $object->$attribute;
 		if ($this->requiredValue === null) {
 			if ($this->strict && $value === null || !$this->strict && $this->isEmpty($value, true)) {
-				$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} cannot be blank.');
+				$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} cannot be blank.');
 				$this->addError($object, $attribute, $message);
 			}
 		} else {
 			if (!$this->strict && $value != $this->requiredValue || $this->strict && $value !== $this->requiredValue) {
-				$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be "{requiredValue}".',
+				$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be "{requiredValue}".',
 					array('{requiredValue}' => $this->requiredValue));
 				$this->addError($object, $attribute, $message);
 			}
@@ -70,7 +70,7 @@ class RequiredValidator extends Validator
 		$message = $this->message;
 		if ($this->requiredValue !== null) {
 			if ($message === null) {
-				$message = Yii::t('yii', '{attribute} must be "{requiredValue}".');
+				$message = \Yii::t('yii', '{attribute} must be "{requiredValue}".');
 			}
 			$message = strtr($message, array(
 				'{attribute}' => $object->getAttributeLabel($attribute),
@@ -84,7 +84,7 @@ if (value != " . json_encode($this->requiredValue) . ") {
 ";
 		} else {
 			if ($message === null) {
-				$message = Yii::t('yii', '{attribute} cannot be blank.');
+				$message = \Yii::t('yii', '{attribute} cannot be blank.');
 			}
 			$message = strtr($message, array(
 				'{attribute}' => $object->getAttributeLabel($attribute),
diff --git a/framework/validators/StringValidator.php b/framework/validators/StringValidator.php
index c5284f1..e46ee94 100644
--- a/framework/validators/StringValidator.php
+++ b/framework/validators/StringValidator.php
@@ -76,7 +76,7 @@ class StringValidator extends Validator
 		}
 
 		if (!is_string($value)) {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} must be a string.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} must be a string.');
 			$this->addError($object, $attribute, $message);
 			return;
 		}
@@ -88,15 +88,15 @@ class StringValidator extends Validator
 		}
 
 		if ($this->min !== null && $length < $this->min) {
-			$message = $this->tooShort !== null ? $this->tooShort : Yii::t('yii', '{attribute} is too short (minimum is {min} characters).');
+			$message = ($this->tooShort !== null) ? $this->tooShort : \Yii::t('yii', '{attribute} is too short (minimum is {min} characters).');
 			$this->addError($object, $attribute, $message, array('{min}' => $this->min));
 		}
 		if ($this->max !== null && $length > $this->max) {
-			$message = $this->tooLong !== null ? $this->tooLong : Yii::t('yii', '{attribute} is too long (maximum is {max} characters).');
+			$message = ($this->tooLong !== null) ? $this->tooLong : \Yii::t('yii', '{attribute} is too long (maximum is {max} characters).');
 			$this->addError($object, $attribute, $message, array('{max}' => $this->max));
 		}
 		if ($this->is !== null && $length !== $this->is) {
-			$message = $this->notEqual !== null ? $this->notEqual : Yii::t('yii', '{attribute} is of the wrong length (should be {length} characters).');
+			$message = ($this->notEqual !== null) ? $this->notEqual : \Yii::t('yii', '{attribute} is of the wrong length (should be {length} characters).');
 			$this->addError($object, $attribute, $message, array('{length}' => $this->is));
 		}
 	}
@@ -113,7 +113,7 @@ class StringValidator extends Validator
 		$value = $object->$attribute;
 
 		if (($notEqual = $this->notEqual) === null) {
-			$notEqual = Yii::t('yii', '{attribute} is of the wrong length (should be {length} characters).');
+			$notEqual = \Yii::t('yii', '{attribute} is of the wrong length (should be {length} characters).');
 		}
 		$notEqual = strtr($notEqual, array(
 			'{attribute}' => $label,
@@ -122,7 +122,7 @@ class StringValidator extends Validator
 		));
 
 		if (($tooShort = $this->tooShort) === null) {
-			$tooShort = Yii::t('yii', '{attribute} is too short (minimum is {min} characters).');
+			$tooShort = \Yii::t('yii', '{attribute} is too short (minimum is {min} characters).');
 		}
 		$tooShort = strtr($tooShort, array(
 			'{attribute}' => $label,
@@ -131,7 +131,7 @@ class StringValidator extends Validator
 		));
 
 		if (($tooLong = $this->tooLong) === null) {
-			$tooLong = Yii::t('yii', '{attribute} is too long (maximum is {max} characters).');
+			$tooLong = \Yii::t('yii', '{attribute} is too long (maximum is {max} characters).');
 		}
 		$tooLong = strtr($tooLong, array(
 			'{attribute}' => $label,
diff --git a/framework/validators/UniqueValidator.php b/framework/validators/UniqueValidator.php
index c58338b..0366792 100644
--- a/framework/validators/UniqueValidator.php
+++ b/framework/validators/UniqueValidator.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * CUniqueValidator class file.
+ * UniqueValidator class file.
  *
  * @link http://www.yiiframework.com/
  * @copyright Copyright &copy; 2008-2012 Yii Software LLC
@@ -13,9 +13,9 @@ namespace yii\validators;
  * CUniqueValidator validates that the attribute value is unique in the corresponding database table.
  *
  * @author Qiang Xue <qiang.xue@gmail.com>
- * @since 1.0
+ * @since 2.0
  */
-class CUniqueValidator extends Validator
+class UniqueValidator extends Validator
 {
 	/**
 	 * @var boolean whether the comparison is case sensitive. Defaults to true.
@@ -28,10 +28,10 @@ class CUniqueValidator extends Validator
 	 */
 	public $allowEmpty = true;
 	/**
-	 * @var string the ActiveRecord class name that should be used to
-	 * look for the attribute value being validated. Defaults to null, meaning using
-	 * the class of the object currently being validated.
-	 * You may use path alias to reference a class name here.
+	 * @var string the yii\db\ar\ActiveRecord class name or alias of the class
+	 * that should be used to look for the attribute value being validated.
+	 * Defaults to null, meaning using the class of the object currently
+	 * being validated.
 	 * @see attributeName
 	 */
 	public $className;
@@ -43,11 +43,11 @@ class CUniqueValidator extends Validator
 	 */
 	public $attributeName;
 	/**
-	 * @var array additional query criteria. This will be combined with the condition
-	 * that checks if the attribute value exists in the corresponding table column.
-	 * This array will be used to instantiate a {@link CDbCriteria} object.
+	 * @var \yii\db\ar\ActiveQuery additional query criteria. This will be
+	 * combined with the condition that checks if the attribute value exists
+	 * in the corresponding table column.
 	 */
-	public $criteria = array();
+	public $query = null;
 	/**
 	 * @var string the user-defined error message. The placeholders "{attribute}" and "{value}"
 	 * are recognized, which will be replaced with the actual attribute name and value, respectively.
@@ -63,56 +63,60 @@ class CUniqueValidator extends Validator
 	/**
 	 * Validates the attribute of the object.
 	 * If there is any error, the error message is added to the object.
-	 * @param \yii\base\Model $object the object being validated
+	 * @param \yiiunit\data\ar\ActiveRecord $object the object being validated
 	 * @param string $attribute the attribute being validated
+	 *
+	 * @throws \yii\base\Exception if table doesn't have column specified
 	 */
 	public function validateAttribute($object, $attribute)
 	{
 		$value = $object->$attribute;
-		if ($this->allowEmpty && $this->isEmpty($value))
+		if ($this->allowEmpty && $this->isEmpty($value)) {
 			return;
+		}
+
+		$className = ($this->className === null) ? get_class($object) : \Yii::import($this->className);
+		$attributeName = ($this->attributeName === null) ? $attribute : $this->attributeName;
 
-		$className = $this->className === null ? get_class($object) : Yii::import($this->className);
-		$attributeName = $this->attributeName === null ? $attribute : $this->attributeName;
-		$finder = CActiveRecord::model($className);
-		$table = $finder->getTableSchema();
-		if (($column = $table->getColumn($attributeName)) === null)
-			throw new CException(Yii::t('yii', 'Table "{table}" does not have a column named "{column}".',
-				array('{column}' => $attributeName, '{table}' => $table->name)));
+		$table = $object::getMetaData()->table;
+		if (($column = $table->getColumn($attributeName)) === null) {
+			throw new \yii\base\Exception('Table "' . $table->name . '" does not have a column named "' . $attributeName . '"');
+		}
 
-		$columnName = $column->rawName;
-		$criteria = new CDbCriteria(array(
-			'condition' => $this->caseSensitive ? "$columnName=:value" : "LOWER($columnName)=LOWER(:value)",
-			'params' => array(':value' => $value),
-		));
-		if ($this->criteria !== array())
-			$criteria->mergeWith($this->criteria);
+		$finder = $object::find();
+		$finder->where($this->caseSensitive ? "{$column->quotedName}=:value" : "LOWER({$column->quotedName})=LOWER(:value)");
+		$finder->params(array(':value' => $value));
+
+		if ($this->query instanceof \yii\db\dao\BaseQuery) {
+			$finder->mergeWith($this->query);
+		}
+
+		if ($object->getIsNewRecord()) {
+			// if current $object isn't in the database yet then it's OK just
+			// to call exists()
+			$exists = $finder->exists();
+		} else {
+			// if current $object is in the database already we can't use exists()
+			$finder->limit(2);
+			$objects = $finder->all();
 
-		if (!$object instanceof CActiveRecord || $object->isNewRecord || $object->tableName() !== $finder->tableName())
-			$exists = $finder->exists($criteria);
-		else
-		{
-			$criteria->limit = 2;
-			$objects = $finder->findAll($criteria);
 			$n = count($objects);
-			if ($n === 1)
-			{
-				if ($column->isPrimaryKey)  // primary key is modified and not unique
+			if ($n === 1) {
+				if ($column->isPrimaryKey) {
+					// primary key is modified and not unique
 					$exists = $object->getOldPrimaryKey() != $object->getPrimaryKey();
-				else
-				{
+				} else {
 					// non-primary key, need to exclude the current record based on PK
 					$exists = array_shift($objects)->getPrimaryKey() != $object->getOldPrimaryKey();
 				}
-			} else
+			} else {
 				$exists = $n > 1;
+			}
 		}
 
-		if ($exists)
-		{
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} "{value}" has already been taken.');
+		if ($exists) {
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} "{value}" has already been taken.');
 			$this->addError($object, $attribute, $message, array('{value}' => $value));
 		}
 	}
-}
-
+}
\ No newline at end of file
diff --git a/framework/validators/UrlValidator.php b/framework/validators/UrlValidator.php
index 52412e7..d3fe679 100644
--- a/framework/validators/UrlValidator.php
+++ b/framework/validators/UrlValidator.php
@@ -55,7 +55,7 @@ class UrlValidator extends Validator
 		if (($value = $this->validateValue($value)) !== false) {
 			$object->$attribute = $value;
 		} else {
-			$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is not a valid URL.');
+			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} is not a valid URL.');
 			$this->addError($object, $attribute, $message);
 		}
 	}
@@ -97,24 +97,24 @@ class UrlValidator extends Validator
 	 */
 	public function clientValidateAttribute($object, $attribute)
 	{
-		$message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is not a valid URL.');
+		$message = ($this->message !== null) ? $this->message : \Yii::t('yii', '{attribute} is not a valid URL.');
 		$message = strtr($message, array(
 			'{attribute}' => $object->getAttributeLabel($attribute),
 			'{value}' => $object->$attribute,
 		));
 
-		if (strpos($this->pattern, '{schemes}') !== false)
+		if (strpos($this->pattern, '{schemes}') !== false) {
 			$pattern = str_replace('{schemes}', '(' . implode('|', $this->validSchemes) . ')', $this->pattern);
-		else
+		} else {
 			$pattern = $this->pattern;
+		}
 
 		$js = "
 if(!value.match($pattern)) {
 	messages.push(" . json_encode($message) . ");
 }
 ";
-		if ($this->defaultScheme !== null)
-		{
+		if ($this->defaultScheme !== null) {
 			$js = "
 if(!value.match(/:\\/\\//)) {
 	value=" . json_encode($this->defaultScheme) . "+'://'+value;
@@ -123,8 +123,7 @@ $js
 ";
 		}
 
-		if ($this->allowEmpty)
-		{
+		if ($this->allowEmpty) {
 			$js = "
 if($.trim(value)!='') {
 	$js
diff --git a/framework/validators/Validator.php b/framework/validators/Validator.php
index aa0d8e6..7e90e46 100644
--- a/framework/validators/Validator.php
+++ b/framework/validators/Validator.php
@@ -69,7 +69,6 @@ abstract class Validator extends \yii\base\Component
 		'integer' => '\yii\validators\IntegerValidator',
 		'double' => '\yii\validators\NumberValidator',
 		'compare' => '\yii\validators\CompareValidator',
-
 		'file' => '\yii\validators\FileValidator',
 		'date' => '\yii\validators\DateValidator',
 		'unique' => '\yii\validators\UniqueValidator',
@@ -145,7 +144,8 @@ abstract class Validator extends \yii\base\Component
 			$params['on'] = array();
 		}
 
-		if (method_exists($object, $type)) {  // method-based validator
+		if (method_exists($object, $type)) {
+			// method-based validator
 			$config = array(
 				'class'	=> '\yii\validators\InlineValidator',
 				'method' => $type,