Items are cached forever with no option to refresh

[nitzanm]

When retrieving an item from a domain using domain[key] for the first time, the item attributes are cached (see Domain.get()). Subsequently when retrieving the same key, you get the object that already exists locally -- the framework doesn't go back to SDB to refresh the data. I see no mechanism to do so except to delete the Domain object and recreate it, which isn't so nice.

Also, there may be a bug if you create an item (using domain[key] on a key that doesn't exist), fill in attributes, and do save(). In some circumstances, I got an empty object back when doing domain[key] later, with no request sent to SDB. In the cases where it happens, it happens consistently, but I didn't drilldown to try and figure out exactly why. A quick look makes me wonder -- in Domain.getitem(), when creating a new Item, why aren't you adding it to self.items? That may be related to the problem.

[mdornseif]

You might wan to check benslavin's branch at http://github.com/benslavin/python-simpledb/commits/ - he has worked on the caching issues.