How to TRUNCATE TABLE using Django's ORM?

Question

To empty a database table, I use this SQL Query:

TRUNCATE TABLE `books`

How to I truncate a table using Django\'s models and ORM?

I

Answer 1

I know this is a very old Question and few corrects answer is in here is as well but I can't resist myself to share the most elegant and fastest way to serve the purpose of this question.

class Book(models.Model):
    # Your Model Declaration

    @classmethod
    def truncate(cls):
        with connection.cursor() as cursor:
            cursor.execute('TRUNCATE TABLE {} CASCADE'.format(cls._meta.db_table))

And now to truncate all data from Book table just call

Book.truncate()

Since this is directly interact with your Database it will perform much faster than doing this

Book.objects.all().delete()

Answer 2

For me the to truncate my local sqllite database I end up with python manage.py flush.

What I have initial tried is to iterate over the models and delete all to rows one by one:

models = [m for c in apps.get_app_configs() for m in c.get_models(include_auto_created=False)]

        for m in models:
            m.objects.all().delete()

But becuse I have Protected foreign key the success of the operation depended on the order of the models.

So, I am using te flush command to truncate my local test database and it is working for me https://docs.djangoproject.com/en/3.0/ref/django-admin/#django-admin-flush