I was using plone.directives.form version 1.0 with Plone 4.2.5 and after upgrading to 4.2.6 I started seeing the following traceback and I guess its due to plone.directives.form being upgraded to version 1.1.
How can I avoid this error? The only line of code that is not from default Plone on the traceback is on der.freitag.handlers where it does a transaction.commit() and the content type is just a regular dexterity content type.
1385740390.020.496977141203 http://10.100.0.207:8081/website/front-page/atomkraft/++add++der.freitag.customizablearticlelink
Traceback (innermost last):
Module ZPublisher.Publish, line 138, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 48, in call_object
Module plone.z3cform.layout, line 70, in __call__
Module plone.z3cform.layout, line 54, in update
Module plone.dexterity.browser.add, line 112, in update
Module plone.z3cform.fieldsets.extensible, line 59, in update
Module plone.z3cform.patch, line 30, in GroupForm_update
Module z3c.form.group, line 138, in update
Module z3c.form.action, line 99, in execute
Module z3c.form.button, line 315, in __call__
Module z3c.form.button, line 170, in __call__
Module plone.dexterity.browser.add, line 99, in handleAdd
Module z3c.form.form, line 247, in createAndAdd
Module plone.dexterity.browser.add, line 78, in add
Module plone.dexterity.utils, line 152, in addContentToContainer
Module Products.BTreeFolder2.BTreeFolder2, line 455, in _setObject
Module zope.event, line 31, in notify
Module zope.component.event, line 24, in dispatch
Module zope.component._api, line 136, in subscribers
Module zope.component.registry, line 321, in subscribers
Module zope.interface.adapter, line 585, in subscribers
Module zope.component.event, line 32, in objectEventNotify
Module zope.component._api, line 136, in subscribers
Module zope.component.registry, line 321, in subscribers
Module zope.interface.adapter, line 585, in subscribers
Module der.freitag.handlers, line 126, in set_customizable_article_link_id
Module transaction._manager, line 89, in commit
Module transaction._transaction, line 329, in commit
Module transaction._transaction, line 443, in _commitResources
Module ZODB.Connection, line 567, in commit
Module ZODB.Connection, line 623, in _commit
Module ZODB.Connection, line 658, in _store_objects
Module ZODB.serialize, line 422, in serialize
Module ZODB.serialize, line 431, in _dump
PicklingError: Can't pickle <class 'plone.directives.form.schema.Schema'>: attribute lookup plone.directives.form.schema.Schema failed
EDIT: the object that is being created has a relation field (a z3c.relationfield.schema.RelationChoice) and it turns out that zc.relation keeps a list of all interfaces provided by each member of any relation. Thus, after upgrading from plone.directives.form version 1.0 to version 1.1 the interfaces on plone.directives.form can no longer be resolved.
From z3c.relationfield documentation I don't see any option to update relations, so the only solution would be to get all relations and recreate them?
Just for reference that's how I fixed it:
While still on plone.directives.form 1.0 update your objects so that they do no longer provide the plone.directives.form.schema.Schema interface.
Then re-create the relations:
from z3c.relationfield import RelationValue
from zc.relation.interfaces import ICatalog
from zope.app.intid.interfaces import IIntIds
from zope.component import getUtility
from zope.event import notify
from zope.lifecycleevent import ObjectModifiedEvent
logger = logging.getLogger(LOGGER)
relations_catalog = getUtility(ICatalog)
intids = getUtility(IIntIds)
relations = [rel for rel in relations_catalog.findRelations()]
len_relations = len(relations)
logger.info('Relations needed to update: {0}'.format(len_relations))
for relation in relations:
# get the object link and the object linked
object_with_link = relation.from_object
object_linked_to = relation.to_object
# remove the broken relation
object_with_link.reference = None
# let the catalog remove the old relation
notify(ObjectModifiedEvent(object_with_link))
# create a new relation
object_linked_to_intid = intids.getId(object_linked_to)
new_relation = RelationValue(object_linked_to_intid)
object_with_link.reference = new_relation
# let the catalog know about this new relation
notify(ObjectModifiedEvent(object_with_link))
After this, stop the instance, run buildout again to update plone.directives.form to version 1.1 and voilà!