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23 / 30Django Models and Database DesignHardPython - Django Framework

Django Model Field Choices and Validation

class Order(models.Model):
    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('processing', 'Processing'),
        ('completed', 'Completed'),
    ]
    status = models.CharField(
        max_length=20,
        choices=STATUS_CHOICES,
        default='pending'
    )
    created_at = models.DateTimeField(auto_now_add=True)

# Hari creates an order:
order = Order.objects.create(status='invalid_status')

  1. Django will raise a validation error immediately because 'invalid_status' is not in STATUS_CHOICES.

  2. The database will reject the value because the choices constraint is enforced at the database level.

  3. The value 'invalid_status' will be stored in the database because choices validation is not enforced at the model save() level by default; explicit validation via clean() is needed.

  4. Django will automatically convert 'invalid_status' to the closest matching choice value.

Show answer & explanation

Correct answer

The value 'invalid_status' will be stored in the database because choices validation is not enforced at the model save() level by default; explicit validation via clean() is needed.

Explanation

Django's CharField with choices doesn't enforce validation at the database level by default. The invalid_status value would be stored unless form validation or model's clean() method is explicitly called. The choices parameter is primarily for display and form widgets.

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All 30 Django Models and Database Design questions

  1. 1.What is the primary purpose of Django Models?
  2. 2.Which field type should be used to store an email address in a Django Model?
  3. 3.What does the Meta class inside a Django Model do?
  4. 4.Which relationship type is used when one model can have many instances of another model?
  5. 5.What is the purpose of the `__str__` method in a Django Model?
  6. 6.Which field attribute makes a field mandatory in Django Models?
  7. 7.What does the `on_delete` parameter do in a ForeignKey relationship?
  8. 8.Which of the following is a valid Django field type for storing boolean values?
  9. 9.What is the default behavior when you don't specify `null=True` for a field in Django?
  10. 10.Which method is used to retrieve a single object from the database in Django?
  11. 11.Understanding Django Model Meta Options
  12. 12.Scenario:
  13. 13.Django QuerySet Filter vs Get Method
  14. 14.Coding:
  15. 15.Scenario:
  16. 16.Understanding Django Model Inheritance
  17. 17.Coding:
  18. 18.Scenario:
  19. 19.Django Model Manager and QuerySet Methods
  20. 20.Coding:
  21. 21.Django Model Inheritance Strategy Selection
  22. 22.Django QuerySet Optimization with select_related vs prefetch_related
  23. 23.Django Model Field Choices and Validation
  24. 24.Django Model Relationships:
  25. 25.Django Model Signals and Database Consistency
  26. 26.Django Model Meta Options:
  27. 27.Django Model Managers and Custom QuerySets
  28. 28.Django Model Field:
  29. 29.Django Model Validation:
  30. 30.Django Model Aggregation and Annotation