默认情况下在Django表单字段中创建空查询集 [英] Create empty queryset by default in django form fields

问题描述

我具有以下形式的字段：

I have this fields in form:

city = forms.ModelChoiceField(label="city", queryset=MyCity.objects.all())
district = forms.ModelChoiceField(label="district", queryset=MyDistrict.objects.all())
area = forms.ModelChoiceField(label="area", queryset=MyArea.objects.all())

区来自单击城市，区域来自单击区域。使用 queryset = MyDistrict.objects.all（）和 queryset = MyArea.objects.all（）形式将非常重。我如何默认使查询集为空？

district comes from click on city and area comes from click on area. With queryset=MyDistrict.objects.all() and queryset=MyArea.objects.all() form will be very heavy. How can I make querysets empty by default?

推荐答案

您可以通过执行以下操作来获得空查询集：

You can have an empty queryset by doing this:

MyModel.objects.none()

尽管我不知道您将如何使用该表格，但您可以将其作为字段的查询集以获取所需的内容...

Although i don't know how are you going to use that form, you can put that as your field's queryset in order to get what you need...

您可以在此处

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