Question

我试图以递归方式调用视图。以下是我的代码。

views.py

def survey_start(request):
   post = models.Post.objects.all().order_by('id')
   return HttpResponseRedirect(reverse('post_form_upload',args=(post[0].id,)))

def post_form_upload(request, id):  
   post = get_object_or_404(models.Post, id=id)

   if request.method == 'GET': 
       content = post.content 
       form = CommentModelForm(content = content)
   else:
       form = CommentModelForm(request.POST)

       if form.is_valid():
           message = form.cleaned_data['message']
           created_at = form.cleaned_data['created_at']
           post1 = models.Comment.objects.create(post = id,
                                        message = message,
                                        created_at = created_at)

           return HttpResponseRedirect(reverse('post_form_upload',
                                            args= (post.next_id,)))
   return render(request, 'survey_forms/post_form_upload.html',{
    'form':form,
    })

urls.py

urlpatterns = [ 
   url(r'^post/form_upload.html$',views.survey_start, name='survey_start'),
   url(r'^post/(?P<id>\d+)/post_form_upload.html$',views.post_form_upload,  name='post_form_upload'),
   ]

我有两个问题我继续犯这个错误。它确实进入了视图。我打印了一个柜台进行检查。

Reverse for 'post_form_upload' with arguments '()' and keyword arguments '{}' not found. 1 pattern(s) tried: ['survey_forms/post/(?P<id>\\d+)/post_form_upload.html$']

这是追溯：

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/survey_forms/post/1/post_form_upload.html

Django Version: 1.8.3
Python Version: 2.7.8
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'survey',
 'dynamic_forms',
 'crispy_forms',
 'formtools',
 'survey_forms')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'dynamic_forms.middlewares.FormModelMiddleware')


Template error:
In template         /Users/Desktop/VtStudy/python/django/2dj_proto/mysurvey/survey_forms/templates/survey_forms/post_form_upload.html, error at line 1
   Reverse for 'post_form_upload' with arguments '()' and keyword arguments '{}' not found. 1 pattern(s) tried: ['survey_forms/post/(?P<id>\\d+)/post_form_upload.html$']

   1 : <form action=" {% url 'post_form_upload' %} "  method='post'>

   2 : {% csrf_token %}

   3 : 

   4 : {{form.as_p}}

   5 : <input type='submit' value='Submit'/>

   6 : </form>

Traceback:
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request,     *callback_args,     **callback_kwargs)
    File         "/Users/Desktop/VtStudy/python/django/2dj_proto/mysurvey/survey_forms/views.py" in         post_form_upload
  132.      'form':form,
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/shortcuts.py" in render
  67.             template_name, context, request=request, using=using)
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/template/loader.py" in render_to_string
  99.         return template.render(context, request)
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/template/backends/django.py" in render
  74.         return self.template.render(context)
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/template/base.py" in render
  209.                     return self._render(context)
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/template/base.py" in _render
  201.         return self.nodelist.render(context)
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/template/base.py" in render
  903.                 bit = self.render_node(node, context)
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/template/debug.py" in render_node
  79.             return node.render(context)
    File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/template/defaulttags.py" in render
  507.                         six.reraise(*exc_info)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  493.             url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-    packages/django/core/urlresolvers.py" in reverse
  579.     return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
File "/Users/.virtualenvs/2dj_proto/lib/python2.7/site-packages/django/core/urlresolvers.py" in _reverse_with_prefix
  496.                              (lookup_view_s, args, kwargs, len(patterns), patterns))

Exception Type: NoReverseMatch at /survey_forms/post/1/post_form_upload.html
Exception Value: Reverse for 'post_form_upload' with arguments '()' and     keyword arguments '{}' not found. 1 pattern(s) tried: ['survey_forms/post/(?    P<id>\\d+)/post_form_upload.html$']

每个帖子都显示在一个页面中。用户必须在点击＆＃34; next＆＃34;时从一个页面导航到另一个页面。所以我递归地调用了这个视图post_upload_form。这是正确的做法吗？

感谢。

Answer 1

第一点：问题出在模板中：

<form action=" {% url 'post_form_upload' %} "  method='post'>

你的urls.py中的

post_form_upload需要一个非空的参数，但是你并没有在上面提供这个参数。

第二点：从技术上讲，这不是递归。您只是将用户重定向到下一个URL，该URL由相同的视图功能处理。这是正确的方法，没有任何问题。

递归地调用django视图

1 个答案: