[Zope] Which method to generate IDs for objects?

[Tim Hicks]

> I am just experimenting with ZClasses and I ran into the following
problem:
> when I instantiate an object this object needs an unique ID. There are
some
> ways to generate this. First of all I thought of the system time as ID,
but
> this can make problems, even though not with high probability. Does
anybody
> out there have a better solution, I think of an ID generation like in a
> sequence: object_id_001, object_id_002, ... but how can I determine the
> last object ID?
>
> Other (better, more simple) ideas?

I don't know if this is very efficient/elegant/etc*, but I use it to get a
unique id within a folder...

-------------
intid = 1
while 1:
   if hasattr(photo_folder, str(intid)):
     intid = intid + 1
   else:

photo_folder.manage_addProduct['ExtFile'].manage_addExtImage(id=str(intid),
file=f_request[photo], create_prev=1, maxx=50, maxy=50, ratio=1)
     break
-------------
photo_folder is a previously defined in the script object.

hth

tim

* I guess it gets a bit less useful as you start having lots of objects in
your folder... I have a max of 4.