[Archetypes-users] Re: auto-increment id field

[Philippe E. <phi...@ph...>]

Martin Aspeli a écrit :
> Hi,
> 
>> I'm trying to implement an auto-increment id field in my Archetype 
>> product.
>>
>> The base value is set by a configlet and stored in portal_properties.
>>
>> I faced those problems :
>> - The default property in the schema is a value that I can't changed
>> (seems to be impossible to a function as a default value) ;
> 
> 
> You can set default_method, but this won't work (see below)
> 
>> - I couldn't acces my portal_properties value within the __init__
>> method of my Archetype class ;
> 
> 
> No, try manage_afterAdd() or initializeArchetype() instead; in
> __init__()  the object isn't yet in the ZODB, so you don't have an
> acqusition context  from which to find the tool.
> 
>> I think I took wrong ways. What is the best one to do this ?
> 
> 
> The id doesn't quite work this way. The object gets created in the ZODB 
> and needs an id for this to work. This happens before all the AT
> machinery  gets hold of the object, so setting a default value won't work.
> 
> The key is generateUniqueId.py. You can either customise this script
> and  check the portal_type parameter to check, or add a method 
> generateUniqueId(portal_type) to the parent class if you have control
> over  this. We use this pattern in PloneSoftwareCenter, for example, to
> generate  version-numbers as ids for new releases.
> 
> Martin
> 

I customised generateUniqueId.py and It works fine.
Thanks.

This is my customised version (if it can help someone) :

## Script (Python) "generateUniqueId"
##bind container=container
##bind context=context
##bind namespace=
##bind script=script
##bind subpath=traverse_subpath
##parameters=type_name=None
##title=
##
from DateTime import DateTime
from random import random
from Products.CMFCore.utils import getToolByName

now=DateTime()
time='%s.%s' % (now.strftime('%Y-%m-%d'), str(now.millis())[7:])
rand=str(random())[2:6]
prefix=''
suffix=''

if type_name == "Bulletin":
    prefix = "BulleTin"
    portal = getToolByName(context, 'portal_url').getPortalObject()
    properties = portal.portal_properties.BaCoCe_properties
    id = str(properties.nobulletin)
    properties.manage_changeProperties(
{'nobulletin':properties.nobulletin+1})
elif type_name is not None:
    prefix = type_name.replace(' ', '_')+'.'
    prefix=prefix.lower()
    id = prefix+time+rand+suffix

return id