Python Django:Admin模板在页面刷新后显示旧值

我将Python3.4与Django 1.7和PyCharm一起使用

我试图通过重写AdminSite类来扩展django管理视图

我的自定义_admin.py：

class MyAdminSite(AdminSite):
    # Text to put at the end of each page's <title>.
    site_title = ugettext_lazy('Test panel title')
    # My custom variable 
    import datetime
    srv_time = "%s" % datetime.datetime.now()


    def each_context(self):
        """
        Overriden dictionary of variables returned for
        *every* page in the admin site.
        """
        return {
            'site_title': self.site_title,
            'site_header': self.site_header,
            'srv_time': self.srv_time,
        }

它是有效的。嗯，有点。 它正确显示当前日期，但当我刷新网页时，它不会自动更新。它一直在显示过去的时光

---

除了重新启动调试Web服务器外，没有任何帮助-然后它会再次显示当前日期，但在页面刷新后它不会更新。

这是因为

srv\u time

被设置为“类”级属性，而不是“实例”级属性

Python为“类”级属性和“实例”级属性保留两个名称空间

当Django被加载时（当您启动服务器时），它只运行一次计算

srv_time

。这就是为什么刷新页面时不会重新计算此值的原因

您需要重写

MyAdminSite

的

\uuuuu init\uuuu

函数，以便在类被实例化为对象时始终运行此计算

class MyAdminSite(AdminSite):
    # Text to put at the end of each page's <title>.
    site_title = ugettext_lazy('Test panel title')
    # My custom variable 
    import datetime
    srv_time = "%s" % datetime.datetime.now()

    def __init__(self, *args, **kwargs):
        super(MyAdminSite, self).__init__(*args, **kwargs)
        self.srv_time = "%s" % datetime.datetime.now()

    def each_context(self):
        """
        Overriden dictionary of variables returned for
        *every* page in the admin site.
        """
        return {
            'site_title': self.site_title,
            'site_header': self.site_header,
            'srv_time': self.srv_time,
        }

---

谢谢你，你的第一种方法不管用，但第二种方法管用：）有趣。。。我想知道为什么？我没有测试第一种方法，我只是假设它可以工作：/。很高兴第二个成功了！

class MyAdminSite(AdminSite):
    # Text to put at the end of each page's <title>.
    site_title = ugettext_lazy('Test panel title')
    # My custom variable 
    import datetime
    srv_time = "%s" % datetime.datetime.now()

    def __init__(self, *args, **kwargs):
        super(MyAdminSite, self).__init__(*args, **kwargs)
        self.srv_time = "%s" % datetime.datetime.now()

    def each_context(self):
        """
        Overriden dictionary of variables returned for
        *every* page in the admin site.
        """
        return {
            'site_title': self.site_title,
            'site_header': self.site_header,
            'srv_time': self.srv_time,
        }

def each_context(self):
        """
        Overriden dictionary of variables returned for
        *every* page in the admin site.
        """
        return {
            'site_title': self.site_title,
            'site_header': self.site_header,
            'srv_time': "%s" % datetime.datetime.now(),
        }