在 Django 组合视图中显示表单错误

Question

我创建了 ListView 和 FormView 的组合。如果我调用表单有效方法一切正常，但如果表单无效并且我尝试初始化 form_invalid 方法并重定向到 MainView 以显示表单错误，我会收到错误消息。

views.py

class MainView(ListView, FormMixin):
    """
    Main which display all posts
    """
    #  Setting template name
    template_name = 'post/main.html'
    #  Setting view model
    model = Post
    # Setting pagination
    paginate_by = 5
    #  Setting form class
    form_class = PostForm

    #  Overriding get_context_data method
    def get_context_data(self, **kwargs):
        context = super(MainView, self).get_context_data(**kwargs)
        context['form'] = self.form_class()
        context['trends'] = Tag.objects.all().order_by('posts')
        return context

    #  Handling post sending
    def post(self, request):
        form = self.form_class(request.POST)

        if form.is_valid():
            self.form_valid(form)
            return redirect('main')
        else:
            self.form_invalid(form)
            return redirect('main')

    def form_valid(self, form):
        #  Getting body text from form
        text = form.cleaned_data['body']
        #  Getting actual logged in user
        author = self.request.user
        #  Getting image file
        image_file = form.cleaned_data['image_file']
        #  Getting image_url
        image_url = form.cleaned_data['image_url']
        #  Creating post instance and saving
        post = Post(text=text, author=author, image_file=image_file, image_url=image_url)
        post.save()

错误

AttributeError at /main/

'MainView' object has no attribute 'object_list'

post/main.html

    <!--Post column-->
    <section class="col-sm-7">

        <!--Iterating through posts-->
        {% for post in object_list %}
        {{ post.text}}
        {% endfor %}

    </section>

Answer 1

问题是 ListView 和 FormMixin 不能一起玩 out-of-box，所以你需要稍微改变一下你的看法。试试这个示例基础视图：

class CreateListView(CreateView, ListView):
    def form_invalid(self, request, *args, **kwargs):
        return self.get(self, request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = CreateView.get_context_data(self, **kwargs)
        context.update(
            super(FormListView, self).get_context_data(**kwargs)
        )
        return context


class MainView(CreateListView):
    template_name = 'post/main.html'
    model = Post
    paginate_by = 5
    form_class = PostForm
    success_url = reverse_lazy('this-view-name')

    def get_context_data(self, **kwargs):
        context = super(MainView, self).get_context_data(**kwargs)
        context['trends'] = Tag.objects.all().order_by('posts')
        return context

在 Django 组合视图中显示表单错误

Display form errors in Django combine view

django

django-forms

django-views