def save(self, session=None, del_links=None, add_links=None):
new_session = Session(title=self.cleaned_data['title'], description=self.cleaned_data['description'], video_url=self.cleaned_data['video_url'])
if session:
new_session.previous_version = session
links = session.link.all()
else:
links = []
new_session.save()
for link in links:
if not link.uuid in del_links:
SessionLink(url=link.url, title=link.title, session=new_session).save()
for url, title in add_links:
SessionLink(url=url, title=title, session=new_session).save()
return new_session
