字段和base_fields - Django [英] fields and base_fields - Django

问题描述

创建平面图时，我希望用户从预定义的列表中选择一个模板。为了保持 Flatpage 模型不变，我更喜欢 ChoiceField over ModelChoiceField （后者提供了模板的PK，但我需要名称为template_name字段）：

When creating a flatpage, I want the user to select a template from a predefined list. In order to keep the Flatpage model untouched, I prefer ChoiceField over ModelChoiceField (the latter provides the PK of the template, but I need the name for the template_name field):

class NewFlatpageForm(FlatpageForm):

    template_name = forms.ChoiceField(choices = [])
    def __init__(self, *args, **kwargs):
        self.base_fields['template_name'].choices = ProjectTemplate.objects.values_list('path', 'name')
        super(NewFlatpageForm, self).__init__(*args, **kwargs)

我覆盖 __ init __ 或Django在服务器启动时填充选项，然后不更新列表。

I override __init__ or Django populates choices at server start and does not update the list then.

我没有任何管理体验，但是当不使用管理员时，我使用字段属性进行了类似的操作。但是在这种情况下，我得到了一个例外： fields 不是表单的属性。 __ dict __ 显示我有一个 base_fields 属性并使用它。所以，为什么在这里使用base_fields，为什么字段不存在，最后我在做某事hacky？

I don't have any admin experience, but I did similar things using the fields attribute when not using admin. However in this case, I got an exception telling fields is not an attribute of the form. __dict__ showed me there's a base_fields attribute and using it works. So, why use base_fields here, and why is fields not present and finally am I doing something hacky?

推荐答案

字段不存在，直到 您调用超级。所以只是交换线的顺序，所以超级首先。

fields doesn't exist until after you've called super. So just swap the order of the lines, so that super comes first.

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