内联表单集是否在保存时返回空列表？ [英] Inline formset returns empty list on save?

问题描述

当我尝试保存嵌入式表单集时，它仅返回一个空列表，并且数据库中未反映任何更改。我试过没有选项和commit = False，但它们都有相同的结果。我知道有数据是因为我将表单集打印为表格，并且我知道它是有效的，因为属性is_valid（）方法返回true。以下是代码：

When I try to save my inline formset it just returns an empty list and no changes are reflected in the database. I have tried doing it with no option and commit=False but they both have the same result. I know there is data because I printed the formset as a table, and I know it is valid because the property is_valid() method returns true. Here is the code:

def edit(request):
    if request.method == 'POST':
        print(request.POST)
        form = TombstoneForm(request.POST)
        print(form.is_valid())
        t = form.save(commit=False)
        t.edit_date = datetime.now()
        t.user_editor = request.user
        t.save()
        print(t)
        formset_construct = inlineformset_factory(Tombstone, Tank, form=TombstoneForm)
        formset = formset_construct(request.POST)
        print("Passed the inline formset")
        print(formset.as_table())
        print(formset.is_valid())
        l = formset.save()
        print(l)
    return render(request, 'main.html')

推荐答案

所以我相信我已经找到问题的根源和解决方法。此方法在BaseModelFormSet类中出现问题：

So I believe I have found the source of my problem and a workaround. The problem was occuring in the BaseModelFormSet class in this method:

    def save_existing_objects(self, commit=True):
        self.changed_objects = []
        self.deleted_objects = []
        if not self.initial_forms:
            return []

        saved_instances = []
        forms_to_delete = self.deleted_forms
        for form in self.initial_forms:
            obj = form.instance
            # If the pk is None, it means either:
            # 1. The object is an unexpected empty model, created by invalid
            #    POST data such as an object outside the formset's queryset.
            # 2. The object was already deleted from the database.
            if obj.pk is None:
                continue
            if form in forms_to_delete:
                self.deleted_objects.append(obj)
                self.delete_existing(obj, commit=commit)
            elif form.has_changed():
                self.changed_objects.append((obj, form.changed_data))
                saved_instances.append(self.save_existing(form, obj, commit=commit))
                if not commit:
                    self.saved_forms.append(form)
        return saved_instances

发生问题的地方：

if obj.pk is None:
    continue

总是命中的地方，所以我的解决方案只是保存单个表单数据而不是表单集数据：

Where it was always hitting continue, so my solution has just been to save the individual form data instead of the formset data:

        for form in formset:
            val = form.save(commit=False)
            val.Vessel = t
            val.save()

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