On 8/28/05, Stephan Richter <[EMAIL PROTECTED]> wrote: > On Wednesday 24 August 2005 15:22, Alec Munro wrote: > > KEY = "demographicinfo" > > > > def getterAndSetter(key): > > def getter(self): > > return self.mapping[key] > > def setter(self, obj): > > self.mapping[key] = obj > > return getter, setter > > > > class DemographicInfo(object): > > implements(IDemographicInfo) > > > > def getAnnotations(self): > > annotations = IAnnotations(self.context) > > return annotations > > This is overkill. You only call this method in the constructor. > I subclass this for a principal as well, in which case I override the above method, which seemed the most obvious way to do it.
.... > > blank['birth_date'] = > > FieldProperty(IDemographicInfo['birth_date']) blank['sex'] = > > FieldProperty(IDemographicInfo['sex']) > > I am 80% sure this is your problem. Properties are meant to be used as > attributes on classes, not as items in a dictionary/mapping. > It works without properties, so I am sure you are right. > > mapping = annotations[KEY] = blank > > self.mapping = mapping > > > > birth_date = property(*getterAndSetter('birth_date')) > > sex = property(*getterAndSetter('sex')) > > This all seems convoluted to me. I think you would be better off with a > __getattr__ and __setattr__ in the adapter that manually does the validation. > I suppose I could do something like: def __setattr__(self, name, obj): if self.mapping.has_key(name): IDemographicInfo[name].validate(obj) self.mapping[name] = obj def __getattr__(self, name): if self.mapping.has_key(name): return self.mapping[name] birth_date = IDemographicInfo['birth_date'].default sex = IDemographicInfo['sex'].default That seems like it might get close to the same effect. I've never user __getattr__ and __setattr__ before, so if you see any downfalls, or there are any cautions I should take, please let me know. Thanks for your response, Alec _______________________________________________ Zope3-users mailing list Zope3firstname.lastname@example.org http://mail.zope.org/mailman/listinfo/zope3-users