Model Discipline implements Serializable interface

~dev_rating/application/classes/Model/Discipline.php

@@ -15,7 +15,7 @@
  * @property $type string
  * @property $isLocked bool
  */
-class Model_Discipline extends Model
+class Model_Discipline extends Model implements Serializable
 {
     private $data;
 
@@ -80,6 +80,23 @@ class Model_Discipline extends Model
         throw new InvalidArgumentException;
     }
 
+    /**
+     * String representation of object.
+     * @return string  the string representation of the object or null
+     */
+    public function serialize() {
+        return serialize($this->data);
+    }
+
+    /**
+     * Constructs the object
+     * @param string $serialized
+     * The string representation of the object.
+     * @return void
+     */
+    public function unserialize($serialized) {
+        $this->data = unserialize($serialized);
+    }
 
     /**
      * @param $id int discipline id