[Django] Session. Control and testing

Before use request.session.session_key in view, check that it exists first:

if request.session.session_key is None:

Session saves by middleware, if session.modified == True, before response will be sent. If settings.SESSION_SAVE_EVERY_REQUEST == True, session will be saved to the database on every request, and session.modified doesn't matter.

If we need to control session manually, we can do like this:

def my_view(request):
    # do something, change session 1
    # do something, change session 2
    request.session.modified = False
    return response
    # the first changes will be saved and the second - no

As for testing, TestCase.client doesn't has session, but we can add it:

from django.conf import settings
from django.test import TestCase
from django.utils.importlib import import_module

class WithSessionTestCase(TestCase):

    def create_session(self):
        # initialize session
        settings.SESSION_ENGINE = 'django.contrib.sessions.backends.file'
        engine = import_module(settings.SESSION_ENGINE)
        store = engine.SessionStore()
        self.session = store
        self.client.cookies[settings.SESSION_COOKIE_NAME] = store.session_key

    def test_something(self):
        # now self.client.session is available


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