"""

This custom Session model adds an extra column to store an account ID. In

real-world applications, it gives you the option of querying the database for

all active sessions for a particular account.

"""

from django.contrib.sessions.backends.db import SessionStore as DBStore

from django.contrib.sessions.base_session import AbstractBaseSession

from django.db import models

class CustomSession(AbstractBaseSession):

    """

    A session model with a column for an account ID.

    """

    account_id = models.IntegerField(null=True, db_index=True)

    @classmethod

    def get_session_store_class(cls):

        return SessionStore

class SessionStore(DBStore):

    """

    A database session store, that handles updating the account ID column

    inside the custom session model.

    """

    @classmethod

    def get_model_class(cls):

        return CustomSession

    def create_model_instance(self, data):

        obj = super().create_model_instance(data)

        try:

            account_id = int(data.get("_auth_user_id"))

        except (ValueError, TypeError):

            account_id = None

        obj.account_id = account_id

        return obj

    def get_session_cookie_age(self):

        return 60 * 60 * 24  # One day.