def _UpdateFollower(follower_id):
"""Create a new follower of this viewpoint in the database."""
follower = Follower(user_id=follower_id,
viewpoint_id=self.viewpoint_id)
follower.timestamp = timestamp
follower.adding_user_id = adding_user_id
follower.viewed_seq = 0
follower.labels = [Follower.CONTRIBUTE]
# Create the follower and corresponding Followed record.
yield [
gen.Task(follower.Update, client),
gen.Task(Followed.UpdateDateUpdated,
client,
follower_id,
self.viewpoint_id,
old_timestamp=None,
new_timestamp=timestamp)
]
raise gen.Return(follower)
