在 Django 会话中添加菜单项列表 [英] adding a list of menu items in a django session

问题描述

我在对象列表中有用户菜单，我想把它放到 django 会话中.我试过了，但 Django 告诉我

I have the user menu in an object list, and I want to put it into the django sesion. I've trying but django tells me

'list' object has no attribute '_meta'

实际上这是代表菜单中项目的对象

actually this is the object that represents a item in the menu

class MenuItem(object):
    def __init__(self, id, name, link, items=None):
        self.id = id
        self.name = name
        self.link = link
        self.items = items

在一个函数中，我将 MenuItems 附加到列表中.

and in a function I append MenuItems in a list.

menu = []
menu.append(MenuItem(1,
                     "hi",
                     "some_link"))

最后在视图中，我尝试将菜单置于会话中.

finally in the view I try to put the menu in session.

request.session['menu'] = menu

这部分是 django 抛出一个

And in this part is when django throws a

'list' 对象没有属性 '_meta' 错误.

'list' object has no attribute '_meta' error.

推荐答案

发生这种情况是因为您尝试在会话中存储的对象不可序列化.

This is happening because the object you're trying to store in the session is not serializable.

你可以用

import json
json.dumps(MenuItem(1, "hi", "some_link"))

哪个给了

MenuItem object at ... is not JSON serializable

您可以做的一件事是编写自己的函数来序列化对象.这是一种解决方法:

One thing you can do is write your own function to serialize the object. Here's one way to approach it:

class MenuItem(object):
    def __init__(self, id, name, link, items=None):
        self.id = id
        self.name = name
        self.link = link
        self.items = items

    def serialize(self):
        return self.__dict__

那么，

menu = []
menu.append(MenuItem(1, "hi", "some_link").serialize())
request.session["menu"] = menu

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