From 5baded9a0f324c4b80fb5c7f8465f2cbf2da29b6 Mon Sep 17 00:00:00 2001
From: Max Holtzberg <max@holtzberg.de>
Date: Fri, 15 Apr 2011 17:16:36 +0200
Subject: [PATCH] Fix missing recursion constraint (issue1954)

---
 category.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/category.py b/category.py
index 9e36dafd86..87d5404f9a 100644
--- a/category.py
+++ b/category.py
@@ -16,6 +16,13 @@ class Category(ModelSQL, ModelView):
     def __init__(self):
         super(Category, self).__init__()
         self._order.insert(0, ('name', 'ASC'))
+        
+        self._constraints += [
+            ('check_recursion', 'recursive_categories'),
+        ]
+        self._error_messages.update({
+            'recursive_categories': 'You can not create recursive categories!',
+        })
 
     def get_rec_name(self, ids, name):
         if not ids: