Description:
Develop a notification system to alert users when they receive new messages. This system will leverage Django signals to detect when messages are sent and use Django Channels to deliver these notifications to users in real-time.
Technical Steps:
1. Design Notification Model
Create a model to store notifications. This model will keep track of which messages have been notified to users and their read status.
2. Set Up Django Signals
Configure Django signals to create a notification each time a message is sent. This ensures that every message triggers a real-time alert to the intended recipient.
E.g.
from django.db.models.signals import post_save
from django.dispatch import receiver
from .models import Message, Notification
@receiver(post_save, sender=Message)
def create_notification(sender, instance, created, **kwargs):
if created:
Notification.objects.create(
recipient=instance.receiver,
message=instance
)
3. Implement WebSocket Consumer for Notifications
Define a WebSocket consumer that handles sending notification data to the user’s client. This consumer listens for notification messages and sends them to the frontend.
E.g.
from channels.generic.websocket import AsyncWebsocketConsumer
import json
class NotificationConsumer(AsyncWebsocketConsumer):
async def connect(self):
self.room_group_name = f'notifications_{self.scope["user"].id}'
# Join room group
await self.channel_layer.group_add(
self.room_group_name,
self.channel_name
)
await self.accept()
async def disconnect(self, close_code):
# Leave room group
await self.channel_layer.group_discard(
self.room_group_name,
self.channel_name
)
# Receive message from room group
async def send_notification(self, event):
notification = event['notification']
# Send message to WebSocket
await self.send(text_data=json.dumps({
'notification': notification
}))
4. Trigger Real-Time Notifications
Modify the signal to send notifications through Django Channels when a new message is saved. This uses the Channels layer to broadcast the notification.
E.g.
Description: Develop a notification system to alert users when they receive new messages. This system will leverage Django signals to detect when messages are sent and use Django Channels to deliver these notifications to users in real-time.
Technical Steps:
1. Design Notification Model
Create a model to store notifications. This model will keep track of which messages have been notified to users and their read status.
2. Set Up Django Signals
Configure Django signals to create a notification each time a message is sent. This ensures that every message triggers a real-time alert to the intended recipient. E.g.
3. Implement WebSocket Consumer for Notifications
Define a WebSocket consumer that handles sending notification data to the user’s client. This consumer listens for notification messages and sends them to the frontend. E.g.
4. Trigger Real-Time Notifications
Modify the signal to send notifications through Django Channels when a new message is saved. This uses the Channels layer to broadcast the notification. E.g.
5. Routing and URL Configuration for WebSocket
Set up routing in
routing.py
to map the notification path to the consumer. E.g.https://docs.djangoproject.com/en/5.0/topics/signals/ https://channels.readthedocs.io/en/latest/topics/channel_layers.html
Task #40