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Quiz

1. Which of the following statements about the get_object_or_404 method in Django is true?

a. It returns the object with the given ID or raises a Http404 exception if the object doesn't exist.
b. It returns a list of objects that match the given lookup parameters or an empty list if no objects are found.
c. It creates a new object with the given parameters or raises a Http404 exception if the object already exists.
d. It updates the object with the given ID and returns the updated object or raises a Http404 exception if the object doesn't exist.
Answer a. It returns the object with the given ID or raises a Http404 exception if the object doesn't exist.
Explanation: In Django, the get_object_or_404 method is a shortcut function that tries to fetch a single object from a database based on certain lookup parameters, such as a primary key or a unique identifier. The method takes two arguments: a model class, and one or more keyword arguments that specify the lookup parameters. If the object exists in the database, get_object_or_404 returns it; otherwise, it raises a Http404 exception.

2. Which of the following statements about the delete() method in Django is true?

a. It deletes the object from the database along with all related objects defined with the on_delete=models.CASCADE parameter.
b. It only soft-deletes the object by setting a deleted_at timestamp field, allowing for possible future recovery.
c. It permanently deletes the object from the database, but raises a ProtectedError if any related objects exist.
d. It automatically creates a database backup before deleting the object, allowing for easy restoration in case of errors.
Answer a. It deletes the object from the database along with all related objects defined with the on_delete=models.CASCADE parameter.
Explanation: In Django, the delete() method is a built-in method of the model class that is used to delete an object from the database. When you call the delete() method on an object, Django generates a SQL DELETE statement that removes the corresponding row from the database table.