使用参数 '()' 和关键字参数 '{'slug': ''}' 反转'detail'。尝试了 1 种模式：['deal/(?P<slug>\\d+)/$']

Question

我使用 Django 为我的 Post 模型创建了 post_create 和 post_detail 视图。我想为新帖子创建 slug，以便在我的 post_list 中单击一些帖子后，他可以重定向到 post_detail 并生成一个独特的 slug。当我运行我的服务器时，它会引发：Reverse for 'detail' with arguments '()' 和关键字参数 '{'slug': ''}' not found。尝试了 1 种模式：['deal/(?P\d+)/$']。如果有人对可能导致此错误的原因有任何指示，我将不胜感激。

views.py：

def deal(request):
    today = timezone.now().date()
    queryset_list = Post.objects.active() #.order_by("-timestamp")

    if request.user.is_staff or request.user.is_superuser:
        queryset_list = Post.objects.all()

    query = request.GET.get("q")

    if query:
        queryset_list = queryset_list.filter(
                Q(from1__icontains=query)|
                Q(type_of_truck__icontains=query)|
                Q(Material_Name__icontains=query) |
                Q(To__icontains=query)|
                Q(Material_Type__icontains=query)
                ).distinct()

    paginator = Paginator(queryset_list, 2) # Show 25 contacts per page
    page_request_var = "page"
    page = request.GET.get(page_request_var)

    try:
        queryset = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        queryset = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        queryset = paginator.page(paginator.num_pages)


    context = {
        "object_list": queryset_list, 
        "from1": "List",
        "page_request_var": page_request_var,
        "today": today,
    }

    return render(request, 'before_login/deal.html', context) 

def post_create(request):
    # if not request.user.is_staff or not request.user.is_superuser:
    # raise Http404

    form = PostForm(request.POST or None)

    if form.is_valid():
        instance = form.save(commit=False)
        print(form.cleaned_data.get("from1"))
        instance.user = request.user
        instance.save()
        # message success
        messages.success(request, "Successfully Created")
        return HttpResponseRedirect(instance.get_absolute_url())

    context = {
        "form": form,
    }
    return render(request, "loggedin_load/post_load.html", context)

def post_detail(request, slug=None): #retrieve
    #instance = Post.objects.get(id=1)
    instance = get_object_or_404(Post, slug=slug)

    if instance.date > timezone.now().date():
        if not request.user.is_staff or not request.user.is_superuser:
            raise Http404
    share_string = quote_plus(instance.Material_Type)

    context = {
        "from1": instance.from1,
        "instance": instance,
        "share_string": share_string
    }
    return render(request, "loggedin_load/post_detail.html", context)

urls.py:

url(r'^deal/$', views.deal, name='deal'),
url(r'^deal/(?P<slug>[\w-]+)/$', views.post_detail, name='detail'),

models.py：

class Post(models.Model):

    user = models.ForeignKey(settings.AUTH_USER_MODEL, default=1)
    from1 = models.CharField(max_length=20)
    type_of_truck = models.CharField(max_length=20)
    date = models.CharField(max_length=20)
    slug = models.SlugField(unique=True)
    weight = models.DecimalField( max_digits=5, decimal_places=2)
    Material_Name = models.CharField(max_length=20)
    To = models.CharField(max_length=20)
    Number_Of_Truck = models.CharField(max_length=20)
    Time = models.CharField(max_length=20)
    Volume = models.CharField(max_length=20)
    Material_Type = models.CharField(max_length=20)
    #updated = models.DateTimeField(auto_now=True, auto_now_add=False)
    timestamp = models.DateTimeField(auto_now=False, auto_now_add=True)

    objects = PostManager()

    def __unicode__(self):
        return self.from1

    def __str__(self):
        return self.from1

    def get_absolute_url(self):
        return reverse("posts:detail", kwargs={"slug": self.slug})

    class Meta:
        ordering = ["-timestamp", "-Time"]



def create_slug(instance, new_slug=None):
    slug = slugify(instance.id)

    if new_slug is not None:
        slug = new_slug

    qs = Post.objects.filter(slug=slug).order_by("-id")
    exists = qs.exists()

    if exists:
        new_slug = "%s-%s" %(slug, qs.first().id)
        return create_slug(instance, new_slug=new_slug)
    return slug


def pre_save_post_receiver(sender, instance, *args, **kwargs):
    if not instance.slug:
        instance.slug = create_slug(instance)



    pre_save.connect(pre_save_post_receiver, sender=Post)

deal.html：

 {% for obj in object_list %}


  <td scope="row">{{obj.date}}</td>
  <td> <a href='{{ obj.get_absolute_url }}'>{{ obj.from1 }}</a><br/></td>
  <td>{{obj.To}}</td>
  <td>{{obj.Material_Type}}</td>
  <td>{{obj.type_of_truck}}</td>
  <td>{{obj.Number_Of_Truck}}</td>
  <td>{{obj.weight}}</td>
  <td>Rs. 55000</td>
  <td><button type="button" id="bidbutton" class="btn btn-secondary fontsize align-centre bidbutton">Bid</button></td>
</tr>
{% endfor %}

post_detail.html：

{% load urlify %}

{% block head_title %}
{{ instance.from1 }} | {{ block.super }}
{% endblock head_title %}



{% block content %}
<div class='col-sm-6 col-sm-offset-3'>

 <!-- <h1>{{ title }} <small>{% if instance.draft %}<span    style='color:red;'>Draft</span>{% endif %} -->{{ instance.from1 }}</small></h1>
{% if instance.from1 %}
<p>{{ instance.Material_Type }}</p>
{% endif %}

追溯：

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/deal/

Django Version: 1.9.7
Python Version: 3.4.4
Installed Applications:
['personal',
'custom_user',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'crispy_forms',
'widget_tweaks']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'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']


Template error:
In template C:\Users\sumanth\Desktop\django-custom-user- master\Project\mysite\personal\templates\before_login\deal.html, error at line 78
 Reverse for 'detail' with arguments '()' and keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['deal/(?P<slug>[\\w-]+)/$']   68 :       <th>Best Offer</th>
 69 :       <th></th>
 70 :     </tr>
 71 :   </thead>
 72 :   <tbody>
 73 :   <tr>
 74 :   {% for obj in object_list %}
 75 :   
 76 :   
 77 :       <td scope="row">{{obj.date}}</td>
 78 :       <td> <a href=' {{ obj.get_absolute_url }} '>{{ obj.from1 }}</a><br/></td>
 79 :       <td>{{obj.To}}</td>
 80 :       <td>{{obj.Material_Type}}</td>
 81 :       <td>{{obj.type_of_truck}}</td>
 82 :       <td>{{obj.Number_Of_Truck}}</td>
 83 :       <td>{{obj.weight}}</td>
 84 :       <td>Rs. 55000</td>
 85 :       <td><button type="button" id="bidbutton" class="btn btn-secondary fontsize align-centre bidbutton">Bid</button></td>
 86 :     </tr>
 87 :   {% endfor %}
 88 :     <!--<tr>

追溯：

File "c:\python34\lib\site-packages\django\core\handlers\base.py" in  get_response
149.                     response = self.process_exception_by_middleware(e, request)

File "c:\python34\lib\site-packages\django\core\handlers\base.py" in get_response
147.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\Users\sumanth\Desktop\django-custom-user-master\Project\mysite\personal\views.py" in deal
70.     return render(request, 'before_login/deal.html', context)

File "c:\python34\lib\site-packages\django\shortcuts.py" in render
67.             template_name, context, request=request, using=using)

File "c:\python34\lib\site-packages\django\template\loader.py" in   render_to_string
97.         return template.render(context, request)

File "c:\python34\lib\site-packages\django\template\backends\django.py" in render
95.             return self.template.render(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render
206.                     return self._render(context)

File "c:\python34\lib\site-packages\django\template\base.py" in _render
197.         return self.nodelist.render(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render
992.                 bit = node.render_annotated(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render_annotated
959.             return self.render(context)

File "c:\python34\lib\site-packages\django\template\loader_tags.py" in render
173.         return compiled_parent._render(context)

File "c:\python34\lib\site-packages\django\template\base.py" in _render
197.         return self.nodelist.render(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render
992.                 bit = node.render_annotated(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render_annotated
959.             return self.render(context)

File "c:\python34\lib\site-packages\django\template\loader_tags.py" in render
69.                 result = block.nodelist.render(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render
992.                 bit = node.render_annotated(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render_annotated
959.             return self.render(context)

File "c:\python34\lib\site-packages\django\template\defaulttags.py" in render
220.                     nodelist.append(node.render_annotated(context))

File "c:\python34\lib\site-packages\django\template\base.py" in render_annotated
959.             return self.render(context)

File "c:\python34\lib\site-packages\django\template\base.py" in render
1043.             output = self.filter_expression.resolve(context)

File "c:\python34\lib\site-packages\django\template\base.py" in resolve
709.                 obj = self.var.resolve(context)

File "c:\python34\lib\site-packages\django\template\base.py" in resolve
850.             value = self._resolve_lookup(context)

File "c:\python34\lib\site-packages\django\template\base.py" in _resolve_lookup
913.                             current = current()

File "C:\Users\sumanth\Desktop\django-custom-user-master\Project\mysite\personal\models.py" in get_absolute_url
47.         return reverse("posts:detail", kwargs={"slug": self.slug})

File "c:\python34\lib\site-packages\django\core\urlresolvers.py" in reverse
600.     return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))

File "c:\python34\lib\site-packages\django\core\urlresolvers.py" in _reverse_with_prefix
508.                              (lookup_view_s, args, kwargs, len(patterns), patterns))

Exception Type: NoReverseMatch at /deal/
Exception Value: Reverse for 'detail' with arguments '()' and keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['deal/(?P<slug>[\\w-]+)/$']

Answer 1

请再看看错误：

没有找到带有参数“()”和关键字参数“{'slug': >''}' 的“详细信息”。尝试了 1 种模式：['deal/(?P\d+)/$']。

您认识网址'deal/(?P\d+)/$' 吗？

似乎此 URL 也有名称 'detail'，并且在您的 posts/urls.py 中定义在 post_detail URL 之前。确保您为 URL 指定的名称是唯一的。

我假设您在问题中包含的任何代码都在您的 posts 应用程序中。

编辑

此编辑是在使用真实数据和回溯更新问题后进行的。

问题在于，并非Posts 模型中的所有条目都有slug。因此 kwarg slug 是空的，这使得 reverse 失败。每次调用模型的 create 方法时，您都可以定义一个方法来创建基于 Posts 模型上的其他字段的唯一 slug。 （您还需要覆盖PostsManager。

您还可以使用pk 代替slug 来查找您的Posts 实例。 pk 在所有 Django 模型上默认可用。

Answer 2

我不确定你是否需要指定posts:detail，这在模型中应该足够了。你的网址被命名为detail，所以试试detail。

models.py

def get_absolute_url(self):
    return reverse("detail", kwargs={"slug": self.slug})

Answer 3

我遇到了类似的问题，经过大量研究，我没有得到任何有用的答案，我来查看我传递 url 的模板，瞧，我没有用正确的 url 更改更改路径以使用 slug 而不是 pk 后的参数。

这是更改前我的模板中的 url 路径和 url 参数：

path('post/<int:pk>/', PostDetailView.as_view(), name='post-detail'),
<a href="{% url 'post-detail' post.pk %}" >

这是修改后的url路径和url参数如下：

path('post/<str:category>/<str:slug>/', PostDetailView.as_view(), name='post-detail'),
<a href="{% url 'post-detail' post.category post.slug %}" >

我知道这个答案目前可能与您无关，但我希望它对其他人有所帮助。