Index: trunk/kernel/units/general/cat_dbitem.php
===================================================================
diff -u -r1566 -r2041
--- trunk/kernel/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 1566)
+++ trunk/kernel/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 2041)
@@ -108,6 +108,37 @@
 		
 		return $ret;
 	}
+	
+	function DeleteFromCategories($delete_category_ids)
+	{
+		$id_field = $this->Application->getUnitOption($this->Prefix, 'IDField'); // because item was loaded before by ResourceId
+		
+		$ci_table = $this->Application->getUnitOption('ci', 'TableName');
+		$resource_id = $this->GetDBField('ResourceId');
+		
+		$item_cats_sql = 'SELECT CategoryId FROM %s WHERE ItemResourceId = %s';
+		$delete_category_items_sql = 'DELETE FROM %s WHERE ItemResourceId = %s';
+		
+		$category_ids = $this->Conn->GetCol( sprintf($item_cats_sql, $ci_table, $resource_id) );
+		$cats_left = array_diff($category_ids, $delete_category_ids);
+		if(!$cats_left)
+		{
+			$sql = 'SELECT %s FROM %s WHERE ResourceId = %s';
+			$ids = $this->Conn->GetCol( sprintf($sql, $id_field, $this->TableName, $resource_id) );
+
+			$temp =& $this->Application->recallObject($this->getPrefixSpecial().'_TempHandler', 'kTempTablesHandler');
+			$temp->DeleteItems($this->Prefix, $this->Special, $ids);
+		}
+		else
+		{
+			$this->Conn->Query( sprintf($delete_category_items_sql, $ci_table, $resource_id) );
+			if( count($cats_left) == 1 )
+			{
+				$sql = 'REPLACE INTO %s (CategoryId,ItemResourceId,PrimaryCat) VALUES (%s,%s,1)';
+				$this->Conn->Query( sprintf($sql, $ci_table, end($cats_left), $resource_id ) );	
+			}
+		}
+	}
 }
 
 ?>
\ No newline at end of file