pfwbged.folder/src/pfwbged/folder/folder.py

from zope.interface import implements
from five import grok
from zope import schema, component
from plone.directives import form

from zc.relation.interfaces import ICatalog
from zope.app.intid.interfaces import IIntIds

from plone.dexterity.content import Container

from Acquisition import aq_parent

from plone.supermodel import model

from . import _

class IFolder(model.Schema):
    """ """


class Folder(Container):
    """ """
    implements(IFolder)

from plone.dexterity.interfaces import IDexterityContainer
grok.templatedir('templates')
grok.context(IDexterityContainer)

from plone.app.layout.viewlets.interfaces import IBelowContentBody

class FolderViewlet(grok.Viewlet):
    grok.template('foldersviewlet')
    grok.viewletmanager(IBelowContentBody)
    grok.order(15)

    def documents(self):
        intids = component.getUtility(IIntIds)
        catalog = component.getUtility(ICatalog)
        intid = intids.getId(self.context)
        documents = []
        for item in catalog.findRelations({'to_id': intid}):
            if item.isBroken():
                continue
            documents.append(aq_parent(item.from_object))
        return documents