diff --git a/category.py b/category.py
index da7a2ec30a..0c98371488 100644
--- a/category.py
+++ b/category.py
@@ -1,11 +1,11 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.model import ModelView, ModelSQL, fields
+from trytond.model import ModelView, ModelSQL, fields, tree
 
 __all__ = ['Category']
 
 
-class Category(ModelSQL, ModelView):
+class Category(tree(separator=' / '), ModelSQL, ModelView):
     "Product Category"
     __name__ = "product.category"
     name = fields.Char('Name', required=True, translate=True)
@@ -17,29 +17,3 @@ class Category(ModelSQL, ModelView):
     def __setup__(cls):
         super(Category, cls).__setup__()
         cls._order.insert(0, ('name', 'ASC'))
-
-    @classmethod
-    def validate(cls, categories):
-        super(Category, cls).validate(categories)
-        cls.check_recursion(categories, rec_name='name')
-
-    def get_rec_name(self, name):
-        if self.parent:
-            return self.parent.get_rec_name(name) + ' / ' + self.name
-        else:
-            return self.name
-
-    @classmethod
-    def search_rec_name(cls, name, clause):
-        if isinstance(clause[2], basestring):
-            values = clause[2].split('/')
-            values.reverse()
-            domain = []
-            field = 'name'
-            for name in values:
-                domain.append((field, clause[1], name.strip()))
-                field = 'parent.' + field
-        else:
-            domain = [('name',) + tuple(clause[1:])]
-        ids = [w.id for w in cls.search(domain, order=[])]
-        return [('parent', 'child_of', ids)]