django MultiValueDictKeyError在请求获取对象时 [英] django MultiValueDictKeyError while requesting get object

问题描述

我已经制作了一个表单来过滤 ListView

I have made a form to filter ListView

class SingleNewsView(ListView):
    model = News
    form_class = SearchForm
    template_name = "single_news.html"

    def get(self, request, pk, **kwargs):
        self.pk = pk

        pub_from = request.GET['pub_date_from']
        pub_to = request.GET['pub_date_to']

        return super(SingleNewsView,self).get(request,pk, **kwargs)

我的表单字段是 pub_date_from 和 pub_date_to 。当我运行该网站时，它说：

MultiValueDictKeyError 。

My form fields are pub_date_from and pub_date_to. When I run the site it says:
MultiValueDictKeyError .

我不知道这是怎么回事。当我删除获得 pub_from 和 pub_to 的两行时，该网站运行正常。我希望这两个值可以过滤查询集。

I don't know what's going on. When I remove the two line of getting pub_from and pub_to the site works fine. I want these two values to filter the queryset.

任何帮助plz

推荐答案

在第一次请求时，没有提交表单数据，因此 request.GET 将没有任何数据。因此，执行 request.GET ['pub_date_from'] 将失败。您应使用 .get（）方法

On first request there is no form data submitted so request.GET would not have any data. So doing request.GET['pub_date_from'] will fail. You shall use .get() method

pub_from = request.GET.get('pub_date_from')
pub_to = request.GET.get('pub_date_to')

如果这些键不在字典中，将返回 None 。因此，请在您的代码中适当地处理此类情况。

If these keys are not in the dict, will return None. So handle the such cases appropriately in your code.

此外，如果要过滤 ListView 的对象，请添加 get_queryset（）方法可返回过滤的查询集，如此处动态过滤

Also, if you want to filter objects for ListView add get_queryset() method to return filtered queryset as explained here Dynamic filtering

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