Django

• Model Relationships:
  • ForeignKey - https://docs.djangoproject.com/en/5.1/topics/db/examples/many_to_one/
  • ManyToManyField - https://docs.djangoproject.com/en/5.1/topics/db/examples/many_to_many/
  • OneToOneField - https://docs.djangoproject.com/en/5.1/topics/db/examples/one_to_one/
• Select related - https://docs.djangoproject.com/en/5.1/ref/models/querysets/#select-related
• Prefetch related - https://docs.djangoproject.com/en/5.1/ref/models/querysets/#prefetch-related
• Model Methods and Properties:
  • Model Methods - https://docs.djangoproject.com/en/5.1/topics/db/models/#model-methods
  • Model Properties - https://docs.djangoproject.com/en/5.1/glossary/#term-property

📚 Django Model Relationships, Methods, and Properties

Tasks

Task 1: Creating a ForeignKey Relationship

1. Create two models: Author and Book.
2. In the Book model, add a ForeignKey field to the Author model.
3. Write a method in the Author model that returns the number of books associated with the author.
4. Test your models by creating a few authors and books, then check the method.

Task 2: Implementing a ManyToManyField

1. Create two models: Student and Course.
2. In the Student model, add a ManyToManyField to the Course model.
3. Write a method in the Student model that lists all the courses a student is enrolled in.
4. Test your models by enrolling students in different courses and calling the method.

Task 3: Using Model Properties

1. Add a date_of_birth field to the Student model.
2. Create a property in the Student model that calculates and returns the student’s age.
3. Test your property by creating a student with a specific date of birth and checking if the age is calculated correctly.