diff --git a/Validator/Constraints/UniqueObject.php b/Validator/Constraints/UniqueObject.php
new file mode 100644
index 0000000..77a37c5
--- /dev/null
+++ b/Validator/Constraints/UniqueObject.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * This file is part of the PropelBundle package.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license    MIT License
+ */
+
+namespace Propel\PropelBundle\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+/**
+ * Constraint for the Unique Object validator
+ *
+ * @author Maxime AILLOUD <maxime.ailloud@gmail.com>
+ */
+class UniqueObject extends Constraint
+{
+    /**
+     * @var array
+     */
+    public $fields = array();
+
+    /**
+     * @return array
+     */
+    public function getRequiredOptions()
+    {
+        return array('fields');
+    }
+
+    /**
+     * The validator must be defined as a service with this name.
+     *
+     * @return string
+     */
+    public function validatedBy()
+    {
+        return get_class($this).'Validator';
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getTargets()
+    {
+        return self::CLASS_CONSTRAINT;
+    }
+
+    /**
+     * @return string
+     */
+    public function getDefaultOption()
+    {
+        return 'fields';
+    }
+
+    /**
+     * @return string
+     */
+    public function getMessage()
+    {
+        return 'A ' . $this->groups[1] . ' object already exists';
+    }
+}
diff --git a/Validator/Constraints/UniqueObjectValidator.php b/Validator/Constraints/UniqueObjectValidator.php
new file mode 100644
index 0000000..8152d68
--- /dev/null
+++ b/Validator/Constraints/UniqueObjectValidator.php
@@ -0,0 +1,77 @@
+<?php
+
+/**
+ * This file is part of the PropelBundle package.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license    MIT License
+ */
+
+namespace Propel\PropelBundle\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * Unique Object Validator checks if one or a set of fields contain unique values.
+ *
+ * @author Maxime AILLOUD <maxime.ailloud@gmail.com>
+ */
+class UniqueObjectValidator extends ConstraintValidator
+{
+    /**
+     * @param object $object
+     * @param \Symfony\Component\Validator\Constraint $constraint
+     * @return Boolean
+     */
+    public function isValid($object, Constraint $constraint)
+    {
+        if (!is_array($constraint->fields) && !is_string($constraint->fields)) {
+            throw new UnexpectedTypeException($constraint->fields, 'array');
+        }
+
+        $fields = (array)$constraint->fields;
+
+        if (count($fields) == 0) {
+            throw new ConstraintDefinitionException("At least one field must be specified.");
+        }
+
+        $class = get_class($object);
+        $peerClass = $class . 'Peer';
+        $queryClass = $class . 'Query';
+        $classFields = $peerClass::getFieldNames(\BasePeer::TYPE_FIELDNAME);
+
+        foreach ($fields as $fieldName) {
+            if(!array_search($fieldName, $classFields)) {
+                throw new ConstraintDefinitionException('The field "' . $fieldName .'" doesn\'t exist in the "' . $class . '" class.');
+            }
+        }
+
+        $bddUsersQuery = $queryClass::create();
+        foreach ($fields as $fieldName) {
+            $bddUsersQuery->filterBy($peerClass::translateFieldName($fieldName, \BasePeer::TYPE_FIELDNAME, \BasePeer::TYPE_PHPNAME), $object->getByName($fieldName, \BasePeer::TYPE_FIELDNAME));
+        }
+        $bddUsers = $bddUsersQuery->find();
+
+        $countUser = count($bddUsers);
+
+        if ($countUser > 1 || ($countUser === 1 && $object !== $bddUsers[0])) {
+            $constraintMessage = $constraint->getMessage();
+            $constraintMessage .= ' with';
+
+            foreach ($fields as $fieldName) {
+              $constraintMessage .=  ' ' . $peerClass::translateFieldName($fieldName, \BasePeer::TYPE_FIELDNAME, \BasePeer::TYPE_PHPNAME) . ' "' . $object->getByName($fieldName, \BasePeer::TYPE_FIELDNAME) . '" and';
+            }
+          
+            $constraintMessage = substr($constraintMessage, 0, -4) . '.';
+            $this->setMessage($constraintMessage);
+            return false;
+        }
+
+
+        return true;
+    }
+}