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

问题描述

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)

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

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?

解决方案

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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