def user_create_digest(user_id=None):
user = User.get_by_id(user_id)
last_digest = Digest.all().filter('user ='******'-created_at').fetch(1)
if last_digest:
last_digest = last_digest[0]
else:
last_digest = None
d = Digest(
user=user,
previous_digest_at=None if not last_digest else last_digest.created_at
)
d.save()
return redirect('/u/{}'.format(user_id))
