class Author(models.Model):
    name = ...
    title = ...
    year = ...

class PartialAuthorForm(ModelForm):
    class Meta:
        model = Author
        fields = ('name','title')

    def __init__(self,*args,**kwargs):
        self.Meta.fields += ('year',)

解决方法

def __init__(self,**kwargs):
    super(PartialAuthorForm,self).__init__(*args,**kwargs)
    self.fields['year'] = forms.CharField(whatever)

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