在Django会话中修改字典不会修改会话 [英] Modifying Dictionary in Django Session Does Not Modify Session

问题描述

我在我的会话中通过字符串键存储字典：

 >>> request.session ['my_dict'] = {'a'：1，'b'：2，'c'：3} 
  

我遇到的问题是，当我直接修改字典时，下一个请求中的值不会被更改：

 >>> request.session ['my_dict']。pop（'c'）
 3 
>>> request.session.has_key（'c'）
 False 
＃看起来不错... 
 ... 
＃下一个请求
>>> request.session.has_key（'c'）
 True 
＃什么给！ 
  

解决方案

作为 文档状态，另一个选项是使用

  SESSION_SAVE_EVERY_REQUEST = True 
  

这将使每一个请求都发生这种情况。如果你的代码发生了很多，可能值得吗？我猜，偶尔的额外开销不会太多，远远低于从忽视的潜在问题，包括

  request.session.modified = True 
  

每次。

I am storing dictionaries in my session referenced by a string key:

>>> request.session['my_dict'] = {'a': 1, 'b': 2, 'c': 3}

The problem I encountered was that when I modified the dictionary directly, the value would not be changed during the next request:

>>> request.session['my_dict'].pop('c')
3
>>> request.session.has_key('c')
False
# looks okay...
...
# Next request
>>> request.session.has_key('c')
True
# what gives!

解决方案

As the documentation states, another option is to use

SESSION_SAVE_EVERY_REQUEST=True

which will make this happen every request anyway. Might be worth it if this happens a lot in your code; I'm guessing the occasional additional overhead wouldn't be much and it is far less than the potential problems from neglecting from including the

request.session.modified = True

line each time.

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