In this commit, I change default field of pub_date into auto_add_now and it change the way pub_date assign work so I need to add several updates to address issues and errors in the code and tests related to the handling of the pub_date attribute in the Question model.
Test Updates
- Modified the create_question function in tests to accept pub_date when necessary and set it explicitly in the tests to match the new model definition.
Ensured the correct ordering of past questions in the index view.
Model Update
- Modified the Question model to use auto_now_add=True for pub_date to set it to the current date and time automatically.
