code: def move_complete_channel(self):
          
  
          to_channel = Channel.objects.get(self.current.task_data['target_channel_key'])
          chosen_channels = self.current.task_data['chosen_channels']
          chosen_channels_names = self.current.task_data['chosen_channels_names']
  
          with BlockSave(Subscriber, query_dict={'channel_id': to_channel.key}):
              for s in Subscriber.objects.filter(channel_id__in=chosen_channels, typ=15):
                  s.channel = to_channel
                  s.save()
  
          with BlockDelete(Message):
              Message.objects.filter(channel_id__in=chosen_channels, typ=15).delete()
  
          with BlockDelete(Channel):
              Channel.objects.filter(key__in=chosen_channels).delete()
  
          self.current.task_data[
              'msg'] = _(u"Chosen channels(%s) have been merged to '%s' channel successfully.") % \
                       (', '.join(chosen_channels_names), to_channel.name)
docs: Channels and theirs subscribers are moved
          completely to new channel or existing channel.