[Product-Developers] Re: extending News Items with schemaextender in Plone 2.5

[Martin Aspeli]

Héctor Velarde wrote:
> I'm starting a new project to extend Plone news items and include a 
> bunch of new fields in order to support something called NITF (News 
> Industry Text Format) using schemaextender.
> 
> I installed schemaextender on "lib/python" using "setup.py install"
> 
> I have this on extender.py:
> 
> from archetypes.schemaextender.interfaces import ISchemaExtender
> from archetypes.schemaextender.field import ExtensionField
> 
> from Products.Archetypes.public import BooleanField, BooleanWidget
> from Products.ATContentTypes.interface import IATNewsItem
> 
> from zope.component import adapts
> from zope.interface import implements
> 
> class UrgencyField(ExtensionField, BooleanField):
>      """Urgency field
>      """
> 
> class NITFExtender(object):
>      """Adapter to add NITF fields to News Items
>      """
>      adapts(IATNewsItem)
>      implements(ISchemaExtender)
> 
>      fields = [
>          UrgencyField('urgency',
>          widget = BooleanWidget(
>              label='Is this item urgent?')),
>              ]
> 
>      def __init__(self, context):
>           self.context = context
> 
>      def getFields(self):
>           return self.fields
> 
> and I have this on configure.zcml:
> 
>    <include package="archetypes.schemaextender" />
>    <adapter factory=".extender.NITFExtender" />
> 
> when I add a new item I don't see my new field
> 
> I'm using the zope3 interface for IATNewsItem.
> 
> I'm using schemaextender from trunk.
> 
> my product's code is here: 
> http://dev.plone.org/collective/browser/nitf4plone/trunk
> 
> (I used code from WebLion's guys to install it.)
> 
> any hint?

I don't think archetypes.schemaextender will work with anything prior to 
Plone 3 (or more specifically, Archetypes 1.5).

Martin

-- 
Author of `Professional Plone Development`, a book for developers who
want to work with Plone. See http://martinaspeli.net/plone-book