Index: branches/5.2.x/core/kernel/db/cat_event_handler.php
===================================================================
diff -u -N -r14644 -r14652
--- branches/5.2.x/core/kernel/db/cat_event_handler.php	(.../cat_event_handler.php)	(revision 14644)
+++ branches/5.2.x/core/kernel/db/cat_event_handler.php	(.../cat_event_handler.php)	(revision 14652)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: cat_event_handler.php 14644 2011-10-06 15:35:08Z alex $
+* @version	$Id: cat_event_handler.php 14652 2011-10-06 15:58:41Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -33,6 +33,7 @@
 			'OnCancelAction' => Array ('self' => true),
 			'OnItemBuild' => Array ('self' => true),
 			'OnMakeVote' => Array ('self' => true),
+			'OnReviewHelpful' => Array ('self' => true),
 		);
 
 		$this->permMapping = array_merge($this->permMapping, $permissions);
@@ -2793,6 +2794,43 @@
 	}
 
 	/**
+	 * Marks review as useful
+	 *
+	 * @param kEvent $event
+	 * @return void
+	 * @access protected
+	 */
+	protected function OnReviewHelpful(&$event)
+	{
+		$review_id = (int)$this->Application->GetVar('review_id');
+
+		if ( !$review_id ) {
+			return;
+		}
+
+		$spam_helper =& $this->Application->recallObject('SpamHelper');
+		/* @var $spam_helper SpamHelper */
+
+		$spam_helper->InitHelper($review_id, 'ReviewHelpful', strtotime('+1 month') - strtotime('now'));
+
+		if ( $spam_helper->InSpamControl() ) {
+			return;
+		}
+
+		$field = (int)$this->Application->GetVar('helpful') ? 'HelpfulCount' : 'NotHelpfulCount';
+
+		$sql = 'UPDATE ' . $this->Application->getUnitOption('rev', 'TableName') . '
+				SET ' . $field . ' = ' . $field . ' + 1
+				WHERE ' . $this->Application->getUnitOption('rev', 'IDField') . ' = ' . $review_id;
+		$this->Conn->Query($sql);
+
+		if ( $this->Conn->getAffectedRows() ) {
+			// db was changed -> review with such ID exists
+			$spam_helper->AddToSpamControl();
+		}
+	}
+
+	/**
 	 * [HOOK] Allows to add cloned subitem to given prefix
 	 *
 	 * @param kEvent $event