integrating Django-postman

Using Django Async/Channels
6

This is attempting to send to a channel named “notifications”.

Unless you have a worker process associated with that name, there’s no place to deliver the message to.

If you’re looking to send a message to a specific user, you need to “locate” that user.

The method that I use, is that every user logging on joins a group named user_<username>. (e.g. user_ken).

Any other channels client can send a message to me by sending a message to the group user_ken.
Example from what you have above:

def send_notification(message):
 # This will print the message to the console
    print(f"Sending message: {message}")

    # assume that the target username is in `message.username`
    group_name = f'user_{message.username}'
    # This will send the message to the client.
    async_to_sync(channel_layer.group_send)(group_name, {
        'type': 'notification.message',
        'message': message
    })

Otherwise, you would need to know the precise channel name for that user in order to direct the message to that user.