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In this article Xiaobian for you to introduce in detail "Django's signal signal mechanism how to use", the content is detailed, the steps are clear, the details are handled properly, I hope this "Django signal signal mechanism how to use" article can help you solve doubts, following the editor's ideas slowly in depth, together to learn new knowledge.

"signal scheduling" is provided in Django to decouple when the framework performs operations, and when certain actions occur, the system performs the corresponding operations according to the functions defined by the signal

I. the signal types built into Django mainly include the following

1.Model_signals

2.Managemeng_signals

3.Request/response_signals

4.Test_signals

5.Datebase_Wrapperd

two。 For the signal built in Django, you only need to register the specified signal, and when the program performs the corresponding operation, the system will automatically trigger the registration function.

1. Described in terms of post_save signal type:

Define it in the _ _ init__.py file in the corresponding application (app) directory. (you can create another .py file and import it in the _ _ init__.py file)

Create a function, listen for the signal, and call the function when the signal is triggered

2. Request_finished signal

After this configuration, django will call the receiver callback function after receiving all request requests.

three。 Further supplement the default signals and its parameters

Model (django/db/models/signal.py)

User logged in (django/contrib/auth/signals.py)

About the request request (django/core/signals.py)

Database connected (django/db/backends/signals.py)

four。 In personal actual project development, the most commonly used signal types are django/db/models/signal.py (for example, sending mail or other operations after the user has successfully registered) and django/contrib/auth/signals.py (sending messages to the user after the user has successfully logged in). If the built-in signal type can not meet the requirements, you can customize the signal, which will not be repeated here.

After reading this, the article "how to use the signal signal mechanism of Django" has been introduced. If you want to master the knowledge of this article, you still need to practice and use it. If you want to know more about the article, please pay attention to the industry information channel.

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