Question

In my django project, I use mysql db for production, and sqlite for tests.

Problem is, some of my code rely on model integrity checking. It works well with mysql, but integrity errors are not thrown when the same code is executed in tests.

I know that foreign keys checking must be activated in sqlite :

PRAGMA foreign_keys = 1;

However, I don’t know where is the best way to do this activation (same question here).

Moreover, the following code won’t work :

def test_method(self):
    from django.db import connection
    cursor = connection.cursor()
    cursor.execute('PRAGMA foreign_keys = ON')
    c = cursor.execute('PRAGMA foreign_keys')
    print c.fetchone()
    >>> (0,)

Any ideas?

Answer 1

So, if finally found the correct answer. All I had to do was to add this code in the __init__.py file in one of my installed app:

from django.db.backends.signals import connection_created


def activate_foreign_keys(sender, connection, **kwargs):
    """Enable integrity constraint with sqlite."""
    if connection.vendor == 'sqlite':
        cursor = connection.cursor()
        cursor.execute('PRAGMA foreign_keys = ON;')

connection_created.connect(activate_foreign_keys)