如何在 django Detailview 中使用多个表单

Question

我在 django 博客中有一个评论部分，有两种形式，一种是评论，另一种是回复评论，但评论表格工作正常，回复表格不起作用！ 我试图做，但得到错误... IntegrityError at /page/9/ FOREIGN KEY 约束失败...

感谢您的帮助:) 谢谢。

views.py
class PostDetailView(DetailView):
model = Post
template_name = "post_detail.html"
context_object_name = 'post'
form = CommentForm()

def get_object(self):
    obj = super().get_object()
    if self.request.user.is_authenticated:
        PostView.objects.get_or_create(
            user=self.request.user,
            post=obj
        )
    return obj

def get_context_data(self, **kwargs):
    category_count = get_category_count()
    most_recent = Post.objects.order_by('-timestamp')[:3]
    context = super().get_context_data(**kwargs)
    context['most_recent'] = most_recent
    context['page_request_var'] = "page"
    context['category_count'] = category_count
    context['form'] = self.form
    return context



def post(self, request, *args, **kwargs):
    form = CommentForm(request.POST)

    form = ReplyForm(request.POST)# how to work with this form like above from 

    if form.is_valid():
        post = self.get_object()
        form.instance.user = request.user
        form.instance.post = post
        form.save()
        return redirect(reverse("post-detail", kwargs={
            'pk': post.pk
        }))

  models.py

class Reply(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    timestamp = models.DateTimeField(auto_now_add=True)
    content = models.TextField()
    comment = models.ForeignKey('Comment', related_name='replies',default=False, null=True, 
                                     on_delete=models.CASCADE)

    def __str__(self):
         return self.content

class Comment(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    timestamp = models.DateTimeField(auto_now_add=True)
    content = models.TextField()
    post = models.ForeignKey('Post', related_name='comments', default=False, 
                              on_delete=models.CASCADE)

    def __str__(self):
         return self.content

Answer 1

如果您不费力地试图说服基于类的视图做它不打算做的事情，而是使用普通的旧的基于函数的视图，您可能会发现它更容易。

这是一个两种形式的视图。 代码已被重构为我认为更好的模式，以验证两个表单并重新显示顶部是否有任何错误，然后您只需执行实际工作来创建和保存底部的对象。

def receive_uncoated( request): #Function based view

    # let's put form instantiation in one place not two, and reverse the usual test. This
    # makes for a much nicer layout with actions not sandwiched by "boilerplate" 
    # note any([ ]) forces invocation of both .is_valid() methods 
    # so errors in second form get shown even in presence of errors in first

    args = [request.POST, ] if request.method == "POST" else []
    batchform = CreateUncWaferBatchForm( *args )
    po_form =  CreateUncWaferPOForm(     *args, prefix='po')
    if request.method != "POST" or any(  
        [ not batchform.is_valid(), not po_form.is_valid() ]):

        return render(request, 'wafers/receive_uncoated.html',   # can get this out of the way at the top
            {'batchform': batchform,  
            'po_form': po_form, 
        })

    #POST, everything is valid, do the work

    # create and save some objects based on the validated forms ... 

    return redirect( 'wafers:ok' )