Question

我想为我的帖子保存评论，但由于某些原因，视图返回（如果我输入了错误的验证码）：

视图MyProject.views.comment_new没有返回HttpResponse 宾语。它返回None。

任何想法可能是这种行为的原因吗？遗憾的是，这是唯一一个似乎完全忽略了我的验证码的地方/形式

views.py

def comment_new(request, pk):
    if request.method == "POST":
        form = CommentForm(request.POST)
        if form.is_valid():
            post = get_object_or_404(Post, pk=pk)
            comment = form.save(commit=False)
            comment.author = request.user
            comment.published_date = timezone.now()
            comment.post = post
            comment.save()
            return redirect('post_detail', pk=comment.post.pk)
    else:
        form = CommentForm()
        return render(request, 'MyProject/comment_new.html', {'form': form})

urls.py：

url(r'^message/(?P<pk>\d+)/free/comment/new/$', auth_required(MyProject_views.comment_new), name='comment_new'),

models.py

class Post(models.Model):
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    title = models.CharField(verbose_name="Post Title", max_length=40)
    content = models.TextField(verbose_name="Post Content", max_length=5000)

....


class Comment(models.Model):
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    post = models.ForeignKey(Post, on_delete=models.CASCADE)
    content = models.TextField(max_length=500)
    published_date = models.DateField(auto_now_add=True, null=True)

    def publish(self):
        self.published_date = timezone.now()
        self.save()

.....

template.html：

    <body>
    <h1 class="center">Create new comment</h1>
    <hr class="hr-style">
    <div>
    <form action="" method="post" class="class-two-box">
        {% csrf_token %}
        <table>
            {{ form.as_p }}
            {{ field.help_text }}
        </table>
        <hr>
        <button class="btn btn-success" type="submit">Publish Comment</button>
     </form>
    </div>
    </body>

forms.py

class CommentForm(forms.ModelForm):
    class Meta:
        model = Comment
        fields = ['content']
    captcha = CaptchaField()

    def __init__(self, *args, **kwargs):
        super(CommentForm, self).__init__(*args, **kwargs)
        self.fields['content'].widget.attrs.update({'class': 'class-two-input-fields'})

Answer 1

首先，它将返回错误：

没有返回HttpResponse对象

因为如果您的form.is_valid()返回False，则没有继续执行的路径，因此返回了None。

您需要这样做：

def comment_new(request, pk):
    if request.method == "POST":
        form = CommentForm(request.POST)
        if form.is_valid():
            post = get_object_or_404(Post, pk=pk)
            comment = form.save(commit=False)
            comment.author = request.user
            comment.published_date = timezone.now()
            comment.post = post
            comment.save()
            return redirect('post_detail', pk=comment.post.pk)
        else: # If for is NOT valid:
            form = CommentForm(request.POST)
            return render(request, 'MyProject/comment_new.html', {'form': form})
    else:
        form = CommentForm()
        return render(request, 'MyProject/comment_new.html', {'form': form})

或者为了避免代码在视觉上重复（保持“ DRY”）：

def comment_new(request, pk):
    if request.method == "POST":
        form = CommentForm(request.POST)
        if form.is_valid():
            post = get_object_or_404(Post, pk=pk)
            comment = form.save(commit=False)
            comment.author = request.user
            comment.published_date = timezone.now()
            comment.post = post
            comment.save()
            return redirect('post_detail', pk=comment.post.pk)
    else:
        form = CommentForm()

    # Note the indentation (this code will be executed both if NOT POST
    # and if form is not valid.
    return render(request, 'MyProject/comment_new.html', {'form': form})

Answer 2

此行

def failTryUnit(x: Unit): Try[Int] = Try {
  println(x)
  1 / 0
}

应该有一个if form.is_valid():分支，否则它将返回else

Django无法保存评论以正确发布

2 个答案: