擴展會話中間件

Question

我正在使用Django 1.3，並且想修改會話中間件以添加一些方法來幫助我。

在./settings.py

SESSION_ENGINE='tcore.my_sessions.MySessionStore' 

在./tcore/my_sessions.py：

from django.contrib.sessions.backends.db import SessionStore 
from django.contrib.sessions.middleware import SessionMiddleware 
from django.conf import settings 

class MySessionStore(SessionStore):  
    .... 
    def my custom methods here 

不過，我不斷收到一些奇怪的例外當我這樣做。制定自定義會話引擎的正確方法是什麼？

AttributeError at /create/ 
type object 'MySessionStore' has no attribute 'SessionStore' 
Request Method: GET 
Request URL: http://localhost:8000/create/ 
Django Version: 1.3.1 
Exception Type: AttributeError 
Exception Value:  
type object 'MySessionStore' has no attribute 'SessionStore' 

Python Version: 2.6.1 

Answer 1

看着documentation of SESSION_ENGINE，舉一個例子：django.contrib.sessions.backends.file。這個模塊的來源定義了一個SessionStore類。所以這是你應該做的太：

./tcore/my_sessions.py：

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

class SessionStore(DbSessionStore): 
    def __init__(self, *args, **kwargs): 
     print 'hello from SessionStore' 
     super(SessionStore, self).__init__(*args, **kwargs) 

settings.py：

SESSION_ENGINE='tcore.my_sessions'