无法覆盖ModelForm中的SelectMultiple小部件(Django)

Question

我有一个要在表单中呈现的ManyToManyField,作为CheckboxSelectMultiple小部件.为什么这些方法都不起作用？(请参阅下面的尝试#1,#2和#3.)根据我在文档和SO中阅读的所有内容,至少其中一个应该有效.但我仍然有一个顽固的SelectMultiple小部件拒绝让步.

from django.forms.widgets import CheckboxSelectMultiple  
from django.db import models
from django import forms

KEYWORD_CHOICES = (('sky', 'sky'),('wind','wind'),)

class Keyword(models.Model):
    keyword = models.CharField(max_length=50)
    def __unicode__(self):
        return self.keyword

class Feedback(models.Model):
    summary = models.CharField(max_length=200)
    keys = models.ManyToManyField(Keyword, blank=True, null=True)

###################################
class FeedbackForm(forms.ModelForm):
    # attempt 1
    # based on 
    # http://docs.djangoproject.com/en/dev/ref/forms/widgets/#specifying-widgets
    keys = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,
                                     choices=KEYWORD_CHOICES)
    class Meta:
        model = Feedback
        # attempt 2
        # based on 
        # http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#overriding-the-default-field-types-or-widgets
        widgets = {
            'keys':CheckboxSelectMultiple(),
            }
    # attempt 3
    # based on 
    # bitkickers.blogspot.com/2010/05/django-manytomanyfield-on-modelform-as.html
    def __init__(self, *args, **kwargs):  
        super(FeedbackForm, self).__init__(*args, **kwargs)  
        self.fields["keys"].widget = CheckboxSelectMultiple()  
        self.fields["keys"].queryset = Keywords.objects.all()

我使用fixture来填充我的初始Keyword实例.

我也试图覆盖help_text但没有成功.

在我views.py我使用的是一个formset:

from app.models import *
from django.forms.models import modelformset_factory

def submit(request):    
    FeedbackFormSet = modelformset_factory(Feedback, extra=1)    
    #[...]    
    feedbackforms = FeedbackFormSet(prefix='feedback',queryset=Feedback.objects.none())

但我不知道这会有什么影响.

我正在使用Django版本1.2.1.

Answer 1

您必须告诉modelformset_factory使用您的自定义FeedbackForm:

FeedbackFormSet = modelformset_factory(Feedback, form=FeedbackForm, extra=1)

在那之后,你的三种方法之一应该工作(我更喜欢Django 1.2的第二种方法).