CreateView + get_absolute_url

Question

我正在尝试使用CreateView，这里有一些问题，我正在堆叠它。

enter code here

首先，我尝试创建一个post，并动态填充创建post的用户字段。它保存帖子，但不保存用户：

来自管理员的图像

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#views.py

    class PostCreateView(CreateView):
        model = Post
        template_name = 'blog/post_create.html'
        fields = ('title', 'slug', 'body',)

        def form_valid(self, form):
            form.instance.blog__user = self.request.user
            return super(PostCreateView,self).form_valid(form)

#models.py

第二个，我认为主要的问题是，我没有正确使用get_absolute_url，我得到了这个问题：

没有要重定向到的URL。

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但它对post_detail很有效。

     class Blog(models.Model):
        user = models.OneToOneField(User, on_delete=models.CASCADE)
        slug = models.SlugField(max_length=50)


        def __str__(self):
            return self.user.username

def create_blog(sender, **kwargs):
    if kwargs['created']:
        user_blog = Blog.objects.create(user=kwargs['instance'], slug=kwargs['instance'])

post_save.connect(create_blog, sender=User)

class Post(models.Model):
    blog = models.ForeignKey(Blog, on_delete=models.CASCADE)
    slug = models.SlugField(max_length=50, db_index=True)
    title = models.CharField(max_length=120, db_index=True)
    body = models.TextField(blank=True, db_index=True)
    pub_date = models.DateTimeField(auto_now_add=True)

    def get_absolute_url(self):
        return reverse('post_detail_url', kwargs={'slug': self.slug,
                                                'username': self.blog})

#urls.py

urlpatterns = [
    path('<username>/create/', PostCreateView.as_view(), name='post_create'),
    path('<username>/<str:slug>/', PostDetailView.as_view(), name='post_detail_url'),
    path('<username>/', PostListView.as_view(), name='post_list_url'),
    path('<username>/<str:slug>/update/', PostUpdateView.as_view(), name='post_update'),

]

我尝试定义get_success_url，得到的结果是: NoReverseMatch

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请帮帮我，我真的迷失在云端了！

Answer 1

尝试下面的代码

class PostCreateView(CreateView):
        model = Post
        template_name = 'blog/post_create.html'
        fields = ('title', 'slug', 'body', 'blog')


        def get_success_url(self):
            return self.post_instance.get_absolute_url()

        def form_valid(self, form):
            form.instance.blog.user = self.request.user
            self.post_instance = form.instance
            return super(PostCreateView,self).form_valid(form)