Re: Re: some newbie questions

> e) I notice that there are object version numbers as attributes of
> many (all?) objects in OGO.  I take it that this is one of the Zope
> inspirations.   I also see that there are comments in the 'logs' tab
> of the web UI that show what changes have happened between versions.
>  However, in Zope objects can be rolled back to previous versions but
> I can't see anyway in OGO  to revert to a previous version of an
> object.  Moreover, when I've uploaded a file into a project, I can't
> see that that file becomes versioned, which I thought was one of the
> document management features of OGO. 
> << 
> I found the versions tab for documents.  Although I can't see how to
> roll back to a previous version. 

You can retrieve a previous version but I'm not aware of an explicit
rollback command.  For documents a "revert" operation would be
interesting and probably trivial to implement;  although it might be
best to just pull a previous version into the current version + 1
instead of doing a true revert (for reason below).

For other objects (Contacts, Tasks, etc...) I'd be opposed to a rollback
command.  The object version is extremely useful for applications to
maintain a cache of objects for either performance or to support offline
use.  With the object version it is trivial to scan for objects that
have changed and to detect conflicts when the client tries to sync with
the server [Oops!  both my copy and the copy of the server have
changed!].  zOGI specifically supports a function for this
<http://code.google.com/p/zogi/wiki/getObjectVersionsById>.  zOGI will
also throw an exception if you attempt to update a Contact or Enterprise
on the server whose version is less than the version on the server.

Groupware information is something that very much lends itself to
offline use + sync.

-- 
OpenGroupware.org Discussion [email protected]
http://mail.opengroupware.org/mailman/listinfo/discuss