On May 11, 2006, at 7:37 AM, Ned Batchelder wrote: > Django provides a great way to separate models and views, and even > pre-populates the project tree with directories named models and > views. > But what about separating models and controllers, that is, separating > the specific database representation of an object from all of the > "business logic" needed to manipulate the object? > > I've seen two patterns in use, and neither is completely satisfactory. > I'm wondering if there are possibilities I've overlooked. > > The first technique is to put all of the logic in the model class. > This > leads to large model classes, and combines all of the field lists with > the logic to manipulate them. > > The second technique is to leave the model classes as bare as possible > (basically just Field declarations), and create a separate module full > of helper methods that has all the logic. This means the objects > don't > manipulate themselves, and you have to go back to non-OO techniques of > passing passive data structures into un-classes functions. > > Is there some way to put the model and the logic in two separate > places > but somehow end up with an object class with real methods? Am I > making > any sense?
Good question, Ned! I usually end up with what's usually thought of as "business logic" in my view code -- but that's a byproduct of the fact that I'm working 99% of the time on web views, so most logic I need to write is concerned with aggregating/filtering data for display. The times when it's not, though, I do struggle with the two different patterns you talk about, and like you I'm not totally happy with either of them. I'd say I more often do the "helper module" thing, but I often later forget about that module and am surprised not to find it somewhere more obvious. Any ideas? Jacob --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~----------~----~----~----~------~----~------~--~---
