未找到帶有參數 '('',)' 的 'post_detail' 反轉。嘗試了 1 個模式：['post/(?P<slug> [-\\\\w]+)/$']

Question

使用 Django 1.11 | 出現這個問題，我以為是因為我從另一個項目中復制了一些網址和視圖，但即使刪除后，問題還是再次出現。 我只是想刪除我的 PostImg 字段並將圖像字段添加為 FileField，但是即使在刪除數據庫和所有遷移等之后也沒有 postImg 字段的問題。這個問題只發生在我沒有帖子（不是對象模型 Post) 在我的數據庫中。 我可以登錄管理員沒問題，然后創建一個帖子，然后它就可以工作了。 我認為這是因為我'，顯示所有帶有模板標簽的帖子，如果沒有對象，這些標簽就無法處理它。

注意：我在添加 slug 時遇到了麻煩，但我找到了一個很好的方法（我不會有任何重復的博客標題）。 但是，這個問題甚至在我添加 slug 之前就發生了。

基本文件

{% load staticfiles %}
<!DOCTYPE html>
<html>
<head>

  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
  <link rel="stylesheet" href="{% static 'css/main.css' %}">
  <script src="//cdn.jsdelivr.net/medium-editor/latest/js/medium-editor.min.js"></script>
    <link rel="stylesheet" href="//cdn.jsdelivr.net/medium-editor/latest/css/medium-editor.min.css" type="text/css" media="screen" charset="utf-8">
  <script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
<title>
 Base working  
</title>
<head>
<body>
  <div class="container">
    <img class="top_logo" src="https://electrek.co/wp-content/uploads/sites/3/2018/08/SX3Semi-Family-e1534526883239.jpg?quality=82&strip=all&w=1600">
  </div>
  <nav class="navbar navbar-expand-md navbar-light bg-light">
    <div class="container">
      <a class="navbar-brand" href="{% url 'blog:home' %}">Home</a>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>

      <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav mr-auto">
          <li class="nav-item">
            <a class="nav-link" href="{% url 'blog:post_list' %}">Archive</a>
          </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
              Dropdown
            </a>
            <div class="dropdown-menu" aria-labelledby="navbarDropdown">
              <a class="dropdown-item" href="#">Action</a>
              <a class="dropdown-item" href="#">Another action</a>
              <div class="dropdown-divider"></div>
              <a class="dropdown-item" href="#">Something else here</a>
            </div>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#" tabindex="-1" aria-disabled="true"></a>
          </li>
        </ul>
        <ul class="navbar-nav navbar-right">
          <li class="nav-item">
            {% if user.is_authenticated %}
              <a class="nav-link" href="{% url 'logout' %}">Log Out</a>
            {% else %}
              <a class="nav-link" href="{% url 'login' %}">Log In</a>
            {% endif %}
          </li>
          {% if not user.is_authenticated %}
            <li class="nav-item">
              <a class="nav-link" href="{% url 'register' %}">Sign up</a>
            </li>
          {% endif %}
        </ul>
        <form class="form-inline my-2 my-lg-0">
          <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
          <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
        </form>
      </div>
    </div>
  </nav>
<div class="container">
  {% if messages %}
    {% for message in messages %}
    <div class="alert alert-{{ message.tags }}"> {{ message }} 
    </div>
    {% endfor %}
  {% endif %}
</div>
<main role="main" class="container">
  <div class="row">
    <div class="col-lg-9 customcontainer">
      {% block content %}
      {% endblock %}
    </div>

    <!-- SideBar -->
    <div class="col-sm d-none d-lg-block">
    <article class="info_box">
      BONUS TEXT
      asdgfdg gararg rsiogj origj  g grjiog orej greiog jreaoig jaeorig jioareg joiareg jioaergj ioaergjio
    </article>
    <br/>
    <article class="info_box">
      BONUS TEXT
      asdgfdg gararg rsiogj origj  g grjiog orej greiog jreaoig jaeorig jioareg joiareg jioaergj ioaergjio
    </article>
    <br/>
    <article class="info_box">
      BONUS TEXT
      asdgfdg gararg rsiogj origj  g grjiog orej greiog jreaoig jaeorig jioareg joiareg jioaergj ioaergjio
    </article>
    <br/>
    <a href="https://www.tesla.com/models">
      <img class="sidebar_img_link" src="https://www.tesla.com/sites/tesla/files/carousel/image/charger-1%402.jpg">
    </a>
  </div>



  </div>
</main>



<footer class="home_footer">
  <div class="container">
    <div class="row">
      <div class="footer_item col-sm">
        <a href="#">Contact Us</a>
      </div>
      <div class="footer_item col-sm">
        <h4 class="">Copyright </h4>
      </div>
      <div class="footer_item col-sm">
        <a href="">Partner with me</a>
      </div>
    </div>
  </div>
</footer>
</body>
</html>

home.html （我試圖訪問的頁面）

{% extends 'blog/base.html' %}
{% block content %}


<div class="intro_text">
    <h3>Hello and welcome!</h3>
    <article>
        this is the official PhyBlog! We talk about all thing physics and engineering here, mainly concerning the environment and global heating,
    </article>
</div>
<br>
<div class="home_text">
    <div class="latest_post">
        {% with post_list|first as post  %}
        <img class=" home_post_img" src="{{ post.postImg }}">

            <h2><a class="post_title_a" href="{% url 'blog:post_detail' post.slug %}">{{ post.title }}</a></h2>
            <article class="intro_text">{{ post.text|safe|truncatewords:20 }}</article> <a class="post_more_a" href="{% url 'blog:post_detail' post.slug %}">mehr lesen</a>
            <p class="post_list_pub">Posted: {{ post.published_date }}</p>

        {% endwith %}
    </div>
</div>
<br>
 <h1>Hello and welcome on the Homepage!</h1>
 <div class="filler">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut est lorem, congue sed eleifend ac, luctus non mauris. Praesent scelerisque quam eu metus tristique, eu luctus ligula dictum. Sed eu felis aliquam, maximus enim sed, tempus turpis. Cras et sapien lacus. Mauris nec enim mollis, pulvinar augue vel, mollis elit. Fusce nec sem finibus lorem imperdiet tempus eu eget purus. Donec ac sagittis est. Phasellus vitae vehicula lacus. Nulla facilisi. <br/>

    Pellentesque odio dui, finibus vitae nunc slug, varius cursus risus. Etiam mollis augue a vulputate venenatis. Nulla et purus vestibulum, hendrerit mauris slug, dignissim ligula. Vivamus ut arcu vehicula, vehicula ante vel, aliquam sem. Pellentesque at maximus quam. Nunc condimentum erat eu tellus suscipit, ut finibus ipsum semper. Ut rhoncus vel metus sed rutrum. Fusce tellus odio, auctor non lacus sit amet, sagittis gravsluga enim. Praesent porttitor dui nec metus vulputate, sit amet vulputate urna ornare.<br/>

    Curabitur lacinia ut tellus eu scelerisque. In hac habitasse platea dictumst. Fusce pulvinar egestas nibh sed porttitor. Nulla consectetur massa ut mattis vehicula. Nullam tempus mattis enim, sit amet fermentum massa varius sit amet. Nullam slug sem vel sem luctus scelerisque vel vel nisi. Ut ultrices vel dui semper dapibus. Proin velit lacus, vehicula ac tincslugunt in, aliquam ac arcu.<br/>

    Cras nec quam blandit, facilisis justo nec, faucibus quam. Cras sed lobortis augue. Fusce justo mauris, commodo egestas ornare sed, porta slug lectus. Sed nulla nibh, molestie vitae faucibus nec, vulputate tristique ipsum. Etiam hendrerit nisi diam, pulvinar rutrum diam viverra in. Donec blandit metus in nibh tristique tempor. Proin rhoncus dolor sed lorem convallis, eu vehicula quam congue. Sed scelerisque tellus ac tellus semper laoreet. Maecenas laoreet vehicula congue. Cras imperdiet egestas tellus, in porttitor nulla tempus quis. Proin gravsluga nibh ut nunc tincslugunt, non venenatis nisl mattis. Morbi efficitur congue nunc. Proin hendrerit ipsum non orci finibus, et ultricies massa finibus. In sodales, massa slug elementum elementum, quam lectus consequat lectus, nec ornare justo augue sit amet sem. Praesent ac porta ligula.<br/>

    Etiam augue quam, aliquet vel mi ut, vestibulum congue tortor. Aliquam congue, nunc a auctor mollis, elit tellus aliquam augue, at ornare ante nisi slug lectus. Praesent quis semper mi. Nulla scelerisque lacus ut nisl molestie aliquet. Morbi lobortis tincslugunt felis, ac gravsluga erat. Aenean eu tristique elit. Quisque malesuada lacus in sem dictum, quis faucibus mi euismod. Quisque ut ante ut nibh laoreet venenatis.<br/>
 </div>
<br/>

<h1>Recent posts:</h1>

<div class="posts">
    <div class="popular_posts">
        {% for post in post_list %}
        <div class="post_homepage row">
            <img class="col-xs home_post_list_img" src="{{ post.postImg }}">
            <div class="col-lg">
                <h2><a class="post_title_a" href="{% url 'blog:post_detail' post.slug %}">{{ post.title }}</a></h2>
                <article class="intro_text">{{ post.text|safe|truncatewords:50 }}</article> <a class="post_more_a" href="{% url 'blog:post_detail' post.slug %}">mehr lesen</a>
                <p class="post_list_pub">Posted: {{ post.published_date }}</p>
            </div>
        </div>
        <br>
        {% endfor %}
    </div>
</div>

{% endblock %}

博客/views.py

from django.utils import timezone
from blog.models import Post, Comment
from blog.forms import PostForm, CommentForm    
from django.views.generic import (TemplateView,
                                  ListView,
                                  DetailView,)

class HomeView(ListView):
    template_name = "home.html"
    model = Post


    def get_queryset(self):
        return Post.objects.all().order_by('-published_date')


class PostListView(ListView):
    model = Post

    def get_queryset(self):
        return Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')

class PostDetailView(DetailView):
    model = Post
    slug_field = 'slug'

博客/網址.py

from . import views
from django.conf.urls import url

urlpatterns = [
    url(r'^$', views.HomeView.as_view(), name="home"),
    url(r'^posts/$', views.PostListView.as_view(), name="post_list"),
    url(r'^post/(?P<slug>[-\w]+)/$', views.PostDetailView.as_view(),name="post_detail"),
]

模型.py

from django.db import models
from django.utils import timezone
from django.urls import reverse
from django.db.models.signals import pre_save
from django.utils.text import slugify


class Post(models.Model):
    author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    title = models.CharField(max_length=200)
    teaser_text = models.CharField(max_length=300, default="",blank=True,null=True)
    text = models.TextField()
    slug = models.SlugField(max_length=200, null=True, blank=True)
    image = models.FileField(null=True, blank=True)
    postImg = models.CharField(max_length=5000, null=True, blank=True)
    created_date = models.DateTimeField(
            default=timezone.now)
    published_date = models.DateTimeField(
            blank=True, null=True)

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

    def approve_comments(self):
        return self.comments.filter(approved_comment=True)

    def get_absolute_url(self):
        return reverse('blog:post_detail',kwargs={'pk':self.pk})

    def __str__(self):
        return self.title

def slug_generator(sender, instance, *args, **kwargs):
    if not instance.slug:
        instance.slug = slugify(instance.title)

pre_save.connect(slug_generator, sender=Post)

class Comment(models.Model):
    post = models.ForeignKey('blog.Post', related_name='comments', on_delete=models.CASCADE)
    author = models.CharField(max_length=200)
    text = models.TextField()
    created_date = models.DateTimeField(default=timezone.now)
    approved_comment = models.BooleanField(default=False)

    def approve(self):
        self.approved_comment = True
        self.save()

    def get_absolute_url(self):
        return reverse("post_list")

    def __str__(self):
        return self.text

項目的 urls.py

from django.conf.urls import url
from django.contrib.auth import views as auth_views
from django.contrib import admin
from django.conf.urls import include
from users import views as user_views

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^', include(("blog.urls", "blog"), namespace="blog")),
    url(r'^register/', user_views.register, name="register"),
    url(r'^profile/', user_views.profile, name="profile"),
    url(r'^login/', auth_views.LoginView.as_view(template_name="users/login.html", redirect_authenticated_user=True), name="login"),
    url(r'^logout/', auth_views.LogoutView.as_view(template_name="users/logout.html"), name="logout"),
]

設置.py

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
TEMPLATE_DIR = os.path.join(BASE_DIR,'blog/templates/blog')

# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '$j+l6i#857mae-*onf%=i7zta&l&bbxt8^bso4_376b9cr3@h1'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = ["127.0.0.1", "www.pythonanywhere.com"]


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'blog',
    'users',
    'crispy_forms',
]

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.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'phyblog.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [TEMPLATE_DIR],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'phyblog.wsgi.application'


# Database
# https://docs.djangoproject.com/en/1.11/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}


# Password validation
# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/1.11/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'Europe/Berlin'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.11/howto/static-files/

STATIC_URL = '/static/'
STATIC_DIR = os.path.join(BASE_DIR, 'blog/static/')
CRISPY_TEMPLATE_PACK = 'bootstrap4'

LOGIN_REDIRECT_URL = 'blog:home'

LOGIN_URL = 'login'

如果我遺漏了任何文件，請告訴我，否則，非常感謝您的幫助

Answer 1

我找到了答案。 所以通常，我總是使用 for 循環來遍歷模板中 post_list 中的所有帖子。 這適用於{% for post in post_list %}因為它只在有對象時迭代。 因此，我將最新的帖子放在頂部，而不是在 for 循環中，模板中的 with 語句： {% with post_list|first as post %}嘗試運行，盡管帖子列表中沒有對象。 因此，我只需要在post_list中添加一個檢查是否有任何帖子，因此home.html中的代碼變為：

{% extends 'blog/base.html' %}
{% block content %}


<div class="intro_text">
    <h3>Hello and welcome!</h3>
    <article>
        this is the official PhyBlog! We talk about all thing physics and engineering here, mainly concerning the environment and global heating,
    </article>
</div>
<br>
<div class="home_text">
    <div class="latest_post">
        {% if post_list %}
        {% with post_list|first as post  %}
        <img class=" home_post_img" src="{{ post.postImg }}">

            <h2><a class="post_title_a" href="{% url 'blog:post_detail' post.slug %}">{{ post.title }}</a></h2>
            <article class="intro_text">{{ post.text|safe|truncatewords:20 }}</article> <a class="post_more_a" href="{% url 'blog:post_detail' post.slug %}">mehr lesen</a>
            <p class="post_list_pub">Posted: {{ post.published_date }}</p>

        {% endwith %}
        {% endif %}
    </div>
</div>
<br>
 <h1>Hello and welcome on the Homepage!</h1>
 <div class="filler">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut est lorem, congue sed eleifend ac, luctus non mauris. Praesent scelerisque quam eu metus tristique, eu luctus ligula dictum. Sed eu felis aliquam, maximus enim sed, tempus turpis. Cras et sapien lacus. Mauris nec enim mollis, pulvinar augue vel, mollis elit. Fusce nec sem finibus lorem imperdiet tempus eu eget purus. Donec ac sagittis est. Phasellus vitae vehicula lacus. Nulla facilisi. <br/>

    Pellentesque odio dui, finibus vitae nunc slug, varius cursus risus. Etiam mollis augue a vulputate venenatis. Nulla et purus vestibulum, hendrerit mauris slug, dignissim ligula. Vivamus ut arcu vehicula, vehicula ante vel, aliquam sem. Pellentesque at maximus quam. Nunc condimentum erat eu tellus suscipit, ut finibus ipsum semper. Ut rhoncus vel metus sed rutrum. Fusce tellus odio, auctor non lacus sit amet, sagittis gravsluga enim. Praesent porttitor dui nec metus vulputate, sit amet vulputate urna ornare.<br/>

    Curabitur lacinia ut tellus eu scelerisque. In hac habitasse platea dictumst. Fusce pulvinar egestas nibh sed porttitor. Nulla consectetur massa ut mattis vehicula. Nullam tempus mattis enim, sit amet fermentum massa varius sit amet. Nullam slug sem vel sem luctus scelerisque vel vel nisi. Ut ultrices vel dui semper dapibus. Proin velit lacus, vehicula ac tincslugunt in, aliquam ac arcu.<br/>

    Cras nec quam blandit, facilisis justo nec, faucibus quam. Cras sed lobortis augue. Fusce justo mauris, commodo egestas ornare sed, porta slug lectus. Sed nulla nibh, molestie vitae faucibus nec, vulputate tristique ipsum. Etiam hendrerit nisi diam, pulvinar rutrum diam viverra in. Donec blandit metus in nibh tristique tempor. Proin rhoncus dolor sed lorem convallis, eu vehicula quam congue. Sed scelerisque tellus ac tellus semper laoreet. Maecenas laoreet vehicula congue. Cras imperdiet egestas tellus, in porttitor nulla tempus quis. Proin gravsluga nibh ut nunc tincslugunt, non venenatis nisl mattis. Morbi efficitur congue nunc. Proin hendrerit ipsum non orci finibus, et ultricies massa finibus. In sodales, massa slug elementum elementum, quam lectus consequat lectus, nec ornare justo augue sit amet sem. Praesent ac porta ligula.<br/>

    Etiam augue quam, aliquet vel mi ut, vestibulum congue tortor. Aliquam congue, nunc a auctor mollis, elit tellus aliquam augue, at ornare ante nisi slug lectus. Praesent quis semper mi. Nulla scelerisque lacus ut nisl molestie aliquet. Morbi lobortis tincslugunt felis, ac gravsluga erat. Aenean eu tristique elit. Quisque malesuada lacus in sem dictum, quis faucibus mi euismod. Quisque ut ante ut nibh laoreet venenatis.<br/>
 </div>
<br/>

<h1>Recent posts:</h1>

<div class="posts">
    <div class="popular_posts">
        {% for post in post_list %}
        <div class="post_homepage row">
            <img class="col-xs home_post_list_img" src="{{ post.postImg }}">
            <div class="col-lg">
                <h2><a class="post_title_a" href="{% url 'blog:post_detail' post.slug %}">{{ post.title }}</a></h2>
                <article class="intro_text">{{ post.text|safe|truncatewords:50 }}</article> <a class="post_more_a" href="{% url 'blog:post_detail' post.slug %}">mehr lesen</a>
                <p class="post_list_pub">Posted: {{ post.published_date }}</p>
            </div>
        </div>
        <br>
        {% endfor %}
    </div>
</div>

{% endblock %}

只需在 with 塊周圍添加一個檢查 {% if post_list %} 以確保它僅在我在數據庫中有帖子要顯示時運行。 我希望這對其他人有幫助。

未找到帶有參數 '('',)' 的 'post_detail' 反轉。嘗試了 1 個模式：['post/(?P<slug> [-\\\\w]+)/$']

問題描述

1 個解決方案

解決方案1
0 2020-01-03 18:14:57

未找到帶有參數 &#39;(&#39;&#39;,)&#39; 的 &#39;post_detail&#39; 反轉。 嘗試了 1 個模式：[&#39;post/(?P<slug> [-\\\\w]+)/$&#39;]

問題描述

1 個解決方案

解決方案1 0 2020-01-03 18:14:57

未找到帶有參數 '('',)' 的 'post_detail' 反轉。嘗試了 1 個模式：['post/(?P<slug> [-\\\\w]+)/$']

解決方案1
0 2020-01-03 18:14:57