The main difference between null=True and blank=true is that
null=True controls whether a field can store a
NULL value in the database whereas
blank=True controls whether a field can be left blank during form validation.
In Django, null=True and blank=True are field options that can be used for model fields, but they serve different purposes:
This option allows a field to store a NULL value in the database. When you set null=True for a field, it means that the field is allowed to have no value or an empty value at the database level. This option is most relevant for fields with a default value of NOT NULL, such as ForeignKey, OneToOneField, DateTimeField, etc.
class Book(models.Model): title = models.CharField(max_length=100) publication_date = models.DateField(null=True)
The publication_date field can have a NULL value in the database, meaning a book can be saved without a publication date.
This option allows a field to be left blank in forms, such as the Django admin or any other form you might use for user input. When you set a
blank=True, it can be empty at the form validation level. If this option is not set, the field will be required, and submitting a form with an empty value for that field will result in a validation error.
class Book(models.Model): title = models.CharField(max_length=100) author = models.CharField(max_length=100, blank=True)
Here, the author field can be left blank in a form, meaning a book can be saved without an author being specified.
You can use these options independently or together, depending on your requirements. For example, if you want a field to be optional both in the database and in forms, you can set both
Hemang is an expert Python developer who completed his bachelor’s degree from VIT Bhopal.