Quiz
1. Which of the following statements about Django signals is true?
a. Django signals are used to handle user authentication and authorization in a Django application.
b. Django signals are an alternative to Django views for handling HTTP requests and generating responses.
c. One django app cannot respond to signals sent by another django app.
d. Django signals allow communication between different parts of a Django application by sending and receiving messages.
Answer
a. Django signals allow communication between different parts of a Django application by sending and receiving messages.Explanation: Django signals are a way of allowing decoupled applications to get notified when certain actions occur elsewhere in the application. They provide a means for different parts of a Django application to communicate with each other by sending and receiving messages. When a particular event occurs, such as saving an object in the database or deleting a record, a signal is sent out, and any receivers that have registered for that signal can perform specific actions or tasks.
2. Which of the following signals in Django is triggered before the save operation is performed on a model instance?
a. pre_save
b. post_save
c. pre_delete
d. post_delete
Answer
a. pre_saveExplanation: The pre_save signal in Django is triggered before the save operation is performed on a model instance. This signal allows you to perform any necessary operations or modifications on the model instance just before it is saved to the database. It is commonly used to automatically populate certain fields or perform validation checks before saving.
2. Which of the following signals in Django is triggered after the save operation is performed on a model instance?
a. pre_save
b. post_save
c. pre_delete
d. post_delete
Answer
b. post_saveExplanation: The post_save signal in Django is triggered after the save operation is successfully completed on a model instance. This signal is useful for performing additional tasks or actions that should happen after the model instance has been saved to the database.