'Gets activity_ids from timeline_storage and then loads the
actual data querying the activity_storage'

def get_activity_slice(self, start=None, stop=None, rehydrate=True):

    activities = self.timeline_storage.get_slice(self.key, start, stop, filter_kwargs=self._filter_kwargs, ordering_args=self._ordering_args)
    if (self.needs_hydration(activities) and rehydrate):
        activities = self.hydrate_activities(activities)
    return activities
