def send_notification(data, user, req_user, email):
    for users in user:
        channel_layer = get_channel_layer()
        group_name = 'user_id_{0}'.format(users.id)
        # print(group_name)
        async_to_sync(channel_layer.group_send)(group_name,
                                                    {
                                                        "type": "notify",
                                                        "text": data,
                                                    },
                                                    )
        if email:
            send_mail(subject='Уведомление', message=f"{data}", from_email=req_user.email,
                      recipient_list=[users.email])  # from_email-от кого и recepient_list-кому
        notify = Notification.objects.create(sender=req_user, message=data)
        notify.receivers.add(users)
        notify.save()