def saveUserPreferences(self, userid, name, value):
index = PluginRegistry.getInstance("ObjectIndex")
res = index.search({'_type': 'User', 'uid': userid}, {'dn': 1})
if not res.count():
raise GOsaException(C.make_error("UNKNOWN_USER", userid))
user = ObjectProxy(res[0]['dn'])
prefs = user.guiPreferences
if not prefs:
prefs = {}
else:
prefs = loads(prefs)
prefs[name] = value
user.guiPreferences = dumps(prefs)
user.commit()
return True
