django signals post_save | django signals example | django signals tutorial
Django signals are a mechanism for allowing decoupled applications to get notified when certain events occur elsewhere in the application. They provide a way for various parts of your Django application to communicate with each other without being directly tied together, promoting loose coupling and modularity.
Here's a basic overview of how Django signals work:
Signal Definition: Signals are essentially a dispatcher mechanism. They are defined in Django's django.dispatch module. You can create your own signals by defining instances of the django.dispatch.Signal class.
Signal Sender: A sender is an object that sends a signal. When something happens in your Django application that you want other parts of the application to be aware of, you can send a signal.
Signal Receiver: A receiver is a function that gets called when a signal is sent. You can connect one or more receiver functions to a signal. These receiver functions will be executed whenever the signal is sent.
Connecting Receivers: You can connect receiver functions to signals using the signal.connect() method. This is typically done in the ready() method of your application configuration class or in the urls.py file.
Signal Sending: To send a signal, you call the send() method on the signal object and pass any necessary arguments. When you send a signal, all connected receiver functions are called with the provided arguments.
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