django model form inheritance

问题

I'm using django modelform inheritence in my modelform but it seems to be not working here is my code sample

class ArticleForm(forms.ModelForm):
  title = forms.CharField(required=True)
  sites = forms.ModelMultipleChoiceField(required=True, queryset= Sites.objects.all().order_by('name'), widget=forms.SelectMultiple())

class ArticleAddForm(ArticleForm):
   class Meta(ArticleForm.Meta):
       exclude = ('sites',)

i want to exclude "sites" from "ArticleAddForm" but while validating it is raising form validation error sites field required please help?

回答1:

ModelForms don't handle inheritance so well, I believe.

Probably the best ou can do is remove the required flag in the child class:

def __init__(self, *args, **kwargs):
    super(ArticleAddForm, self).__init__(*args, **kwargs)
    self.base_fields['sites'].required = False
    self.base_fields['sites'].widget = HiddenInput() # if you want

回答2:

In your view, you need to initialize the ArticleAddForm with an Article object to fill the blank fields, i.e. the excluded fields. For example:

sites = Sites.objects.all()    # modify this according to your needs
article = Article(title='', sites=sites)
form = ArticleAddForm(request.POST, instance=article)
form.save()

来源：https://stackoverflow.com/questions/12645875/django-model-form-inheritance