Looking at my post, I can see where not knowing Django would be an impediment to understanding... :)
Let me try again (and please bare with me because I am *not* an expert on Django). Django has these things called Managers: http://docs.djangoproject.com/en/dev/topics/db/managers/ from the Django docs: class Manager A Manager is the interface through which database query operations are provided to Django models. At least one Manager exists for every model in a Django application. You can create your own Managers and use them with your models. You can create custom QuerySets (filters basically) and use them with your Managers. In the example I gave, he creates a function today(): from datetime import datetime, timedelta def today(): now = datetime.now() start = datetime.min.replace(year=now.year, month=now.month, day=now.day) end = (start + timedelta(days=1)) - timedelta.resolution return (start, end) Then a custom QuerySet (EventQuerySet) that extends the base QuerySet with a today method which uses the function he defined above. self.filter(creation_date__range=today()) # __range is part of the django filtering syntax Then he creates a custom Manager (EventManager) and assigns it to 'objects' in his model: class Event(models.Model) #.... objects = EventManager() So now when he calls Event.objects he is really calling an instance of the EventManager() He does one more thing though.. All models have a default save method which is called explicitly to commit changes. He overrides the inherited default save method with this one: def save(self, **kwargs): Event.objects.filter(latest=True, creator=self.creator).today().update(latest=False) super(Event, self).save(**kwargs) So now whenever an Event object is saved, this code will execute regardless of where it happens because save is a model method. I think I explained that correctly (possibly not well :) What would be the best (or most DRY) way to do something like this in web2py? Thanks again to all for indulging my questions... On Jul 29, 1:51 pm, Fran <francisb...@googlemail.com> wrote: > On Jul 29, 6:51 pm, __future__ <wrigh...@gmail.com> wrote: > > > So can I create a custom filter like the EventQuerySet in the example > > and then apply it in the controller? I assume I will have to use this > > anywhere an event might get an update? Can I use it with crud? > > I don't quite follow the example (I'm not familiar with Django) but > what I think you're looking for is: > crud.settings.create_onvalidation = lambda form: mycustomfilter(form) > > F --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to web2py@googlegroups.com To unsubscribe from this group, send email to web2py+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/web2py?hl=en -~----------~----~----~----~------~----~------~--~---
