I'm registering a utility which I would like to list a folder's contents so as
to populate a drop down or multi select widget;
problem is the utility gets called from the content type's interface/schema
definition and there seems to be no way to pass it a context either for
getSiteManager's lookups, or simply traversing to the desired folder and
listing its contents.
Naturally my example cod below doesn't work but it should shed some light on my
(so far) unsuccessful approach..
class IGroupIds(Interface):
"""Lists a group folder's items"""
def getGroupIds():
"""go get'em"""
class GroupIds:
implements(IGroupIds)
def getGroupIds(self, context):
root = getParents(context)[-2]
return [item for item in root['groups'].keys()]
### register it as a utility
def register_groupids_util(context, event):
sm = getSiteManager(context)
groupids = GroupIds()
sm.registerUtility(groupids, IGroupIds, 'groupids')
### access it from a content type's interfaces which gets called by the form
render
client_specified_groups = component.queryUtility(IGroupIds,
'groupids').getGroupIds(context)
class INeedTheGroupListing(IContainer):
groups = List(
value_type=Choice( title= u'Client generated groups',
values=client_specified_groups,),
required=True
)
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