Question

我正在使用django v.1.11.3。这是我的模型字段声明。

class Post(models.Model):
    slug = models.SlugField(max_length=80, unique_for_month='pub_date')
    pub_date = models.DateField('date published', auto_now_add=True)
    ...

    def get_absolute_url(self):
        return reverse('blog_post_detail', kwargs={'year': self.pub_date.year,
                                                'month':  self.pub_date.month,
                                                'slug': self.slug,})

我使用ModelForms如下创建用户表单。

class PostForm(forms.ModelForm):
    class Meta:
        model = Post
        fields = '__all__'

    def clean_slug(self):
        return self.cleaned_data['slug'].lower()

但是，当我尝试输入重复的段并重定向到新创建的帖子时，它是在db中创建的，由于多个对象返回，get方法调用失败。

这是详细信息页面的URL配置和FBV。

url(r'^(?P<year>\d{4})/(?P<month>\d{1,2})/(?P<slug>[\w\-]+)/$', 
post_detail, name='blog_post_detail'),

def post_detail(request, year, month, slug):
    post = get_object_or_404(Post, pub_date__year=year, pub_date__month=month, 
    slug=slug)
    return render(request, 'blog/post_detail.html', {'post': post})

最后，这是调试数据中显示的错误。

MultipleObjectsReturned at /blog/2018/8/python-3-programming/
get() returned more than one Post -- it returned 2!

~/workspace/src/blog/views.py in post_detail
    post = get_object_or_404(Post, pub_date__year=year, pub_date__month=month, 
    slug=slug)

我检查了数据库，并在同一个月看到两个条目。怎么了？

更新CBV代码：

class PostCreate(View):
    form_class = PostForm
    template_name = 'blog/post_form.html'

    def get(self, request):
        return render(request, self.template_name, {'form': self.form_class()})

    def post(self, request):
        bound_form = self.form_class(request.POST)
        if bound_form.is_valid():
            new_post = bound_form.save()
            return redirect(new_post)
        else:
            return render(request, self.template_name, {'form': bound_form})

Django模型Slug字段unique_for_month不起作用

0 个答案: