def breakRelations(event):
"""Break relations on any object pointing to us.
That is, store the object path on the broken relation.
"""
obj = event.object
if not IHasIncomingRelations.providedBy(obj):
return
catalog = component.queryUtility(ICatalog)
intids = component.queryUtility(IIntIds)
if catalog is None or intids is None:
return
# find all relations that point to us
try:
obj_id = intids.getId(obj)
except KeyError:
# our intid was unregistered already
return
rels = list(catalog.findRelations({'to_id': intids.getId(obj)}))
for rel in rels:
rel.broken(rel.to_path)
# we also need to update the relations for these objects
notify(ObjectModifiedEvent(rel.from_object))
def test_relation(self):
contact = create(Builder('contact'))
self.assertTrue(IHasIncomingRelations.providedBy(contact))