Django Signals Explained in Hindi: Everything You Need to Know
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Django Signals are a powerful mechanism for allowing various parts of your Django application to communicate with each other. They provide a way to allow certain senders to notify a set of receivers when some action has taken place. Think of them as event handlers within your Django project.
How Do Django Signals Work?
Signal Definition: You define a signal using the django.dispatch.Signal class. This signal acts as a trigger for specific events.
Signal Sender: When a particular event occurs (e.g., a new user is registered), the sender emits the signal.
Signal Receiver: Other parts of your application (receivers) can listen for this signal. They perform specific actions when the signal is received.
Common Use Cases:
User Registration and Profile Creation:
When a new user registers, you can use a signal to automatically create a profile for them.
Example: After user registration, a signal triggers the creation of a user profile with default settings.
Notifications and Alerts:
Send notifications (emails, SMS, or push notifications) when specific events occur.
Example: Notify users when they receive a new message or when their subscription is about to expire.
Audit Trails and Logging:
Record important actions (e.g., user login, data updates) for auditing purposes.
Example: Use signals to log user login events or track changes to critical data.
Automated Tasks:
Execute background tasks asynchronously.
Example: After a user submits a form, trigger a signal to process the data and send an email.
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