Look at db.DateTimeProperty, specifically its definition of get_value_for_datastore.
get_value_for_datastore has access to model_instance so it can look at other properties. You should think about how your property knows the name of the other property that it looks at. On Feb 9, 2:45 pm, Jason DeFontes <ja...@defontes.com> wrote: > Is there a simple way to have a calculated property that automatically > updates itself any time an entity is saved? For example: > > class Article(db.Model): > body = db.StringProperty() > word_count = db.IntegerProperty() > > I'd like to put some code in the Article class such that word_count is > automatically updated any time body is modified. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
