def save(self, commit=True, update=False,item_relation_id=None):
session = Session()
if update:
item_relation = session.query(ItemRelation).get(item_relation_id)
else:
item_relation = ItemRelation()
item_relation.title = self.cleaned_data['title']
if not update:
session.add(item_relation)
session.commit()
item_relation.id = item_relation.id
session.close()
return item_relation
