def __set__(self, inst, value):
if getattr(inst, '__data__', None) is None:
raise ValueError(self.__name, _(u"Can't set field"))
field = self.__field.bind(inst)
field.validate(value)
if field.readonly and self.__name in inst.__data__:
raise ValueError(self.__name, _(u'Field is readonly'))
inst.__data__[self.__name] = value
def handleCopyFromParent(self, action):
self.context.copyDataFromParent()
IStatusMessage(self.request).add(_(u'Setting has been copied'))
self.redirect('.')
