from notifications.handlers import send_message

send_message('Mahmoud Liked your post', user, 'post_like')

# function interface
send_message(message:str, user:User, type:str)

# logic behind it
message: the text message to be sent to the user
user: an instance of User model (the one who will recieve the notification)
type: is a notification tag (you should create different types in your system for different events)

INSTALLED_APPS = [
    ...
    'channels', # django channels needs to be installed
    'notifications', # our package
    ...   
]

# Note: this step is optional
SIMPLE_NOTIFICATION_SETTINGS = {
    'receive_handler_path': 'custom_module.custom_py_file.custom_receive_handler',
}

path('api/v1/notifications/', include('notifications.urls')),

from notifications import routing

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'demo_project.settings')

application = ProtocolTypeRouter({
    'http': get_asgi_application(),
    'websocket': AuthMiddlewareStack(
        URLRouter(
            routing.websocket_urlpatterns
        )
    ),
})

# or if you have other routing files you can do this
application = ProtocolTypeRouter({
    'http': get_asgi_application(),
    'websocket': AuthMiddlewareStack(
        URLRouter([
            *routing.websocket_urlpatterns,
            *other_routing1.websocket_urlpatterns,
            *other_routing2.websocket_urlpatterns,
        ])
    ),
})