覆盖表单的__init__方法并在那里设置queryset。
class FooForm(forms.Form):
bar = forms.ModelChoiceField(queryset=Bar.objects.none())
def __init__(self, *args, **kwargs):
qs = kwargs.pop('bars')
super(FooForm, self).__init__(*args, **kwargs)
self.fields['bar'].queryset = qs
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