--- a/goa/appobjects/gauthservice.py	Tue Feb 17 17:30:47 2009 +0100
+++ b/goa/appobjects/gauthservice.py	Tue Feb 17 17:31:16 2009 +0100
@@ -1,29 +1,18 @@
 """authentication using google authentication service
 
 :organization: Logilab
-:copyright: 2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+:copyright: 2008-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 :contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
 """
 __docformat__ = "restructuredtext en"
 
-from cubicweb.common.registerers import priority_registerer
 from cubicweb.web.views.basecomponents import UserLink
 from cubicweb.web.views.actions import LogoutAction
 
 from google.appengine.api import users
 
 
-class use_google_auth_registerer(priority_registerer):
-    """register object if use-google-auth is true"""
-    
-    def do_it_yourself(self, registered):
-        if not hasattr(self.config, 'has_resource'):
-            return
-        return super(use_google_auth_registerer, self).do_it_yourself(registered)
-
-
 class GAEUserLink(UserLink):
-    __registerer__ = use_google_auth_registerer
 
     def anon_user_link(self):
         self.w(self.req._('anonymous'))
@@ -31,7 +20,11 @@
                % (users.create_login_url(self.req.url()), self.req._('login')))
 
 class GAELogoutAction(LogoutAction):
-    __registerer__ = use_google_auth_registerer
 
     def url(self):
         return users.create_logout_url(self.req.build_url('logout') )
+    
+def registration_callback(vreg):
+    if hasattr(vreg.config, 'has_resource'):
+        vreg.register(GAEUserLink, clear=True)
+        vreg.register(GAELogoutAction, clear=True)

--- a/server/hooksmanager.py	Tue Feb 17 17:30:47 2009 +0100
+++ b/server/hooksmanager.py	Tue Feb 17 17:31:16 2009 +0100
@@ -23,7 +23,7 @@
 
 
 :organization: Logilab
-:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 :contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
 """
 __docformat__ = "restructuredtext en"
@@ -182,7 +182,7 @@
             
 from cubicweb.vregistry import autoselectors
 from cubicweb.common.appobject import AppObject
-from cubicweb.common.registerers import accepts_registerer, yes_registerer
+from cubicweb.common.registerers import yes_registerer
 from cubicweb.common.selectors import yes
 
 class autoid(autoselectors):
@@ -195,7 +195,7 @@
 class Hook(AppObject):
     __metaclass__ = autoid
     __registry__ = 'hooks'
-    __registerer__ = accepts_registerer
+    __registerer__ = yes_registerer
     __selectors__ = (yes,)
     # set this in derivated classes
     events = None
@@ -245,7 +245,6 @@
         raise NotImplementedError
     
 class SystemHook(Hook):
-    __registerer__ = yes_registerer
     accepts = ('',)
 
 from logging import getLogger

--- a/vregistry.py	Tue Feb 17 17:30:47 2009 +0100
+++ b/vregistry.py	Tue Feb 17 17:31:16 2009 +0100
@@ -289,13 +289,16 @@
                 break
     
     def register_and_replace(self, obj, replaced, registryname=None):
+        if hasattr(replaced, 'classid'):
+            replaced = replaced.classid()
         registryname = registryname or obj.__registry__
         registry = self.registry(registryname)
         registered_objs = registry[obj.id]
         for index, registered in enumerate(registered_objs):
             if registered.classid() == replaced:
-                registry[obj.id][index] = obj
-                self._registered['%s.%s' % (obj.__module__, obj.id)] = obj                
+                del registry[obj.id][index]
+                break
+        self.register(obj, registryname=registryname)
 
     # dynamic selection methods ###############################################