Question

我有一个formset，但我无法弄清楚如何使用数据库中的数据预先填充它。

说实话，我有一个模型库和一个具有Library外键的模型Book。我希望有人能够在一个库中一次编辑所有书籍。

HTML

        {{ book_form.management_form }}
        {% for form in book_form.forms %}
            {{ form.as_p }}
        {% endfor %}

views.py

class LibraryUpdateView(LoginRequiredMixin, UpdateView):
model      = Library
form_class = LibraryChangeForm
template_name = 'libraries/library_update.html'

def get_context_data(self, *args, **kwargs):
    context = super(LibraryUpdateView, self).get_context_data(*args, **kwargs)
    if self.request.POST:
        context['book_form'] = BookFormSet(self.request.POST)
    else:
        context['book_form'] = BookFormSet()
    return context

形式

class LibraryChangeForm(forms.ModelForm):
    class Meta:
        exclude = ['updated']

BookFormSet = inlineformset_factory(Library, Book, exclude = () )

如何预填充html页面以显示formset中的数据。在我的循环中，{{form.as_p}}有3个循环。当我运行print(BookFormsSet())时，我会看到以下内容

<input type="hidden" name="perdateinfo_set-TOTAL_FORMS" value="3"...

所以看起来它生成了三个空白表格。

当我为print(PerDateInfoFormSet(qs,qs2))运行qs = Library.objects.filter(library_id='slkdfj') and qs2=Book.objects.filter(library_id='slkdfj')时，它会告诉我too many values to unpack (expected 2)

我可以传入查询集吗？我想我会传入qs.first（）来获取库，然后传递多个（qs2）查询集来获取库中的所有书籍。

Answer 1

您需要将实例参数传递给formset：

def get_context_data(self, *args, **kwargs):
    context = super(LibraryUpdateView, self).get_context_data(*args, **kwargs)
    if self.request.POST:
        context['book_form'] = BookFormSet(self.request.POST, instance=self.object)
    else:
        context['book_form'] = BookFormSet(instance=self.object)
    return context

Django：prepopulate formset

1 个答案: