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

我在表单中有这些字段:

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())

地区来自点击城市，地区来自点击地区.使用 queryset=MyDistrict.objects.all() 和 queryset=MyArea.objects.all() 表单会很重.默认情况下，如何使查询集为空?

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获得一个空的查询集:

You can have an empty queryset by doing this:

MyModel.objects.none()

虽然我不知道您将如何使用该表单，但您可以将其作为字段的查询集以获取您需要的内容...

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...

您可以在此处找到更多信息

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