Question

我正在尝试使用我自己的mixin“BaseViewMixin”扩展一个简单的基于日期的视图（使用1.3泛型类方法）：

class BaseViewMixin(object):
    """define some basic context for our views"""

    model = Alert
    month_format = "%m"
    date_field = "date"

    def get_context_data(self, **kwargs):
        """extra context"""
        context = super(BaseViewMixin, self).get_context_data(**kwargs)
        context["CACHE_SERVERS"] = settings.CACHE_SERVERS
        return context


    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        return super(BaseViewMixin, self).dispatch(*args, **kwargs)

class IndexView(BaseViewMixin, TodayArchiveView):

    template_name= "index.html"

    def get_context_data(self, **kwargs):
        context = super(IndexView, self).get_context_data(**kwargs)
        queryset = Alert.objects.default(self.day)
        tickets = Alert.objects.tickets(self.day)
        alert_groups = []
        for item in tickets:
            alert_groups.append({"ticket": item, "alerts": queryset.filter(ticket=item["ticket"])})
        context["alert_groups"] = alert_groups
        return context

问题是，一旦我覆盖了我的IndexView类的get_context_data方法，就会消除您通常在上下文中获得的所有基于日期的事物。这是为什么？我希望{{day}}，{{previous_day}}等出现在上下文中，以及self中。当我删除我的get_context_data方法时，所有通用日期的东西都有效。

urls.py条目只是：

url(r'^$', IndexView.as_view(), name='index'),

Answer 1

这是一种允许我重用代码的方法。我仍然不理解为什么get_context_data在原始问题中按照我的定义方式消除TodayArchiveView上下文。似乎使用下面的场景对我的mixin做同样的事情，但事实并非如此。在get_context_data中调用DateMixin时，会保留ViewMixin上下文。

class ViewMixin(object):
    """define some basic context for our views"""

    model = Alert

    def get_context_data(self, **kwargs):
        """extra context"""
        context = super(ViewMixin, self).get_context_data(**kwargs)
        context["CACHE_SERVERS"] = settings.CACHE_SERVERS
        return context

    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        return super(ViewMixin, self).dispatch(*args, **kwargs)

class DateMixin(object):

    month_format = "%m"
    date_field = 'date'

    def get_alert_groups(self):
        none, qs, dated_items = self.get_dated_items()
        day = dated_items["day"]
        queryset = Alert.objects.default(day)
        tickets = Alert.objects.tickets(day)
        alert_groups = []
        for item in tickets:
            alert_groups.append({"ticket": item, "alerts": queryset.filter(ticket=item["ticket"])})
        return alert_groups

    def get_context_data(self, **kwargs):
        context = super(DateMixin, self).get_context_data(**kwargs)
        context["alert_groups"] = self.get_alert_groups()
        return context

class IndexView(ViewMixin, DateMixin, TodayArchiveView):

    template_name= "index.html"

Answer 2

出现这个问题是因为你从2个课程中就已经存在了。

context = super(IndexView, self).get_context_data(**kwargs)将使用BaseViewMixin而不是TodayArchiveView（从左到右的超级步行基类）的方法初始化上下文 - ＆gt;来自TodayArchiveView的上下文变量将丢失。

我认为你可以这样做：

def get_context_data(self, **kwargs):
    context = super(IndexView, self).get_context_data(**kwargs)
    context_day = super(BaseViewMixin, self).get_context_data(**kwargs)
    context = dict(context, **context_day)
    ...

Answer 3

不是您问题的准确答案，但考虑到您的目标似乎是为多个视图添加某个上下文，context processor可能是一个很好的解决方案！

在django和get_context_data中扩展基于类，日期的通用视图？

3 个答案: