def get_episode_changes(user, podcast, device, since, until, aggregated, version):
devices = dict( (dev.id, dev.uid) for dev in user.devices )
args = {}
if podcast is not None:
args['podcast_id'] = podcast.get_id()
if device is not None:
args['device_id'] = device.id
actions = EpisodeAction.filter(user._id, since, until, **args)
if version == 1:
actions = imap(convert_position, actions)
clean_data = partial(clean_episode_action_data,
user=user, devices=devices)
actions = map(clean_data, actions)
actions = filter(None, actions)
if aggregated:
actions = dict( (a['episode'], a) for a in actions ).values()
until_ = get_timestamp(until)
return {'actions': actions, 'timestamp': until_}
