将Django的inlineformset工厂限制为仅创建新对象

inlineformset_factory采用formset kwarg,默认为BaseInlineFormSet。BaseInlineFormSet子类BaseModelFormSet,它定义一个get-queryset方法。如果创建BaseInlineFormSet子类并重写get_queryset以返回EmptyQuerySet(),则应获取所需的内容。在上面的例子中,它看起来是这样的:

from django.db.models.query import EmptyQuerySet
from django.forms.models import BaseInlineFormSet

class BaseInlineAddOnlyFormSet(BaseInlineFormSet):
    def get_queryset(self):
        return EmptyQuerySet()

author = Author.objects.get(pk=1)
BookFormSet = inlineformset_factory(Author, Book, formset=BaseInlineAddOnlyFormSet)
formset = BookFormSet(request.POST, instance=author)

基于Jeremy Lewis,如果不想将BaseInlineFormSet子类化,只需为BookFormSet提供一个空的queryset参数。

请参阅伪(未测试)Django 1.6代码示例:

BookFormSet = inlineformset_factory(parent=Author, model=Book)
if request.method == "POST":
    formset = BookFormSet(request.POST, request.FILES, instance=author)
    if formset.is_valid():
        formset.save()
else:
    queryset = Book.objects.none() # does not allow to edit books
    formset = BookFormSet(instance=project, initial=initial, queryset=queryset)
return render(request, "add_book.html", { "formset": formset, })

实际上答案在 documentation

>>> from django.forms.models import inlineformset_factory
>>> BookFormSet = inlineformset_factory(Author, Book)
>>> author = Author.objects.get(name=u'Mike Royko')
>>> formset = BookFormSet() # This will create an empty form with your model fields

然后可以按如下方式创建视图:

if request.method == "POST":
    formset = BookFormSet(request.POST, request.FILES)
    if formset.is_valid():
        formset.save()
else:
    formset = BookFormSet()
return render_to_response("add_book.html", {
    "formset": formset,

希望有帮助。