Django ORM and locking table

Question

My problem is as follows:

I have a car dealer A, and a db table named sold_cars. When a car is being sold I create entry in this table.

Table ha

Answer 1

from contextlib import contextmanager
from django.db import transaction
from django.db.transaction import get_connection


@contextmanager
def lock_table(model):
    with transaction.atomic():
        cursor = get_connection().cursor()
        cursor.execute(f'LOCK TABLE {model._meta.db_table}')
        try:
            yield
        finally:
            cursor.close()

This is very similar to @jdepoix solution, but a but more dense.

You can use it like this:

with lock_table(MyModel):
    MyModel.do_something()

Note that this only works with PostgreSQL and uses python 3.6's f-strings a.k.a. literal string interpolation.