[Nitro] Revisable -- is it the correct semantics??

[James Britt]

Michael Fellinger wrote:
> On Wednesday 28 June 2006 12:25, James Britt wrote:

>>What was revised?  You want the revision number to get upped on every
>>save, even if the item has not changed?  Hmmm.
>>
>>On the other hand, to do otherwise may introduce assorted questions
>>about determining when something has changed in a meaningful way (i.e.,
>>some concept of a  'dirty' flag)
> 
> 
> Which also raises the question of partial updates - depending on what 
> changed...
> That is what i forgot - i think there's no problem with rising the revision on 
> save... is there?

Well, the simplest thing may be to just assume that a call to 'save' 
means there was a change (else why save it?), and the business logic 
just has to take that into account.  Then if someone doesn't want these 
gratuitous revisions, they can implement some has_changed? behavior and 
skip the save (perhaps intercept the call to save and do an update, 
instead) if by whatever logic the object is not to be considered revised.

-- 
James Britt

"I often work by avoidance."
- Brian Eno