django - 根据内联相关的对象，将选择限制为通用内联 FK 字段

Question

我试图限制在通用内联中找到的 FK 字段的选择，具体取决于内联所附加的内容。

例如，我有 Article，具有通用关系 Publishing，与 Article 内联编辑。

我希望 PublishingInline 以某种方式“知道”它当前正在对文章进行内联编辑，并将可用的 PublishingTypes 限制为 content_type Article .

这是我的开始:

class PublishingInlineForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):

        try:
            data = kwargs.pop("data", {})
            if kwargs["instance"]:
                publishing_type_kwargs = {
                    'content_type': kwargs["instance"].content_type, }
                data["publishing_type"] = PublishingType.objects.filter(**publishing_type_kwargs)
                kwargs["data"] = data
        except KeyError:
            pass

        super(PublishingInlineForm, self).__init__(*args, **kwargs)

class PublishingInline(generic.GenericStackedInline):

    form = PublishingInlineForm

    model = get_model('publishing', 'publishing')
    extra = 0

Answer 1

如果我没理解错的话formfield_for_foreignkey在你的 GenericInlineModelAdmin 上是你的 friend 。

按照这些思路应该可以做到这一点:

def formfield_for_foreignkey(self, db_field, request, **kwargs):
    print self.parent_model # should give you the model the inline is attached to
    if db_field.name == "publishing_type":
        kwargs["queryset"] = ... # here you can filter the selectable publishing types based on your parent model
    return super(PublishingInline, self).formfield_for_foreignkey(db_field, request, **kwargs)