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我对 Django 相当陌生，我遵循了一个帮助使用 Django 创建博客的教程。那个项目很顺利。但是当我想使用我从该教程中学到的东西并制作我自己的简单网站时，事情就变成了梨形。我已经解决这个问题很长时间了，这真的让我很烦恼，所以我希望一双新的眼睛可以帮助我破解这个问题。

我得到的错误是：

Reverse for 'course_detail' with arguments '()' and keyword arguments '{u'cd': ''}' not found. 1 pattern(s) tried: ['course/(?P<cd>\\d+)/$']

现在我知道在我的原始项目中，我的论点中的“cd”之前从来没有一个“u”，我不知道这是从哪里来的，我不知疲倦地寻找导致这种情况的原因，但我找不到它。

以下是有关此问题的其余代码：

course_list.html

   {% load staticfiles %}
    <html>
        <head>
            <title>Courses</title>
            <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
            <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css">
            <link rel="stylesheet" href="{% static 'css/website.css' %}">
            <link href="//fonts.googleapis.com/css?family=Lobster&subset=latin,latin-ext" rel="stylesheet" type="text/css">
            <link href="https://fonts.googleapis.com/css?family=Oswald" rel="stylesheet" type="text/css">
        </head>
        <body>
            <div class="links">
                <h1><a href="">Home</a> |
                <a href="">Courses</a> |
                <a href="">Venues</a> |
                <a href="">About Us</a> |
                <a href="">Contact Us</a></h1>
            </div>

            <div class="page-header">
                <h1><a href="">Courses</a></h1>
            </div>

            <div class="content container">
                <div class="row">
                    <div class="col-md-8">
                    {% for course in courses %}
                        <div class="course">
                            <h2><a href="{% url 'course_detail' cd=course.cd %}">{{ course.course_name }}</a></h2>
                            <p><b>Course code: </b> {{ course.course_code }}</p>
                            <p><b>Price: </b> {{ course.price }} </p>
                            <p><b>Course topic: </b> {{ course.topic_details }} </p>
                                <div class="date">
                                    <p><b>Start Date: </b> {{ course.start_date }}</p>
                                    <p><b>End Date: </b> {{ course.end_date }}</p>
                                </div>
                            <p><b>Availability: </b> {{ course.status }}</p>
                            <p><b>Course venue: </b> {{ course.venue }}</p>
                            <p><b>Room course will be held in: </b> {{ course.room }}</p>

                                <button class="button">Book Course</button>

                        </div>
                    {% endfor %}
                    </div>
                </div>
            </div>
            <div class="footer">
                <h3>Other Links</h3>
            </div>

        </body>

    </html>

course_detail.html

 {% extends 'website/base.html' %}
    {% block content %}
                        <div class="course">
                            <p><b>Course code: </b> {{ course.course_code }}</p>
                            <p><b>Price: </b> {{ course.price }} </p>
                            <p><b>Course topic: </b> {{ course.topic_details }} </p>
                                <div class="date">
                                    <p><b>Start Date: </b> {{ course.start_date }}</p>
                                    <p><b>End Date: </b> {{ course.end_date }}</p>
                                </div>
                            <p><b>Availability: </b> {{ course.status }}</p>
                            <p><b>Course venue: </b> {{ course.venue }}</p>
                            <p><b>Room course will be held in: </b> {{ course.room }}</p>

                                <button class="button">Book Course</button>

                        </div>

    {% endblock %}

视图.py

from django.shortcuts import render
from django.shortcuts import render, get_object_or_404
from .models import Course

# Create your views here.
def course_list(request):
    courses = Course.objects.all()
    return render(request, 'website/course_list.html', {'courses': courses})

def course_detail(request, cd):
    course = get_object_or_404(Course, cd=cd)
    return render(request, 'website/course_detail.html', {'course': course})

网址.py

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

urlpatterns = [
    url(r'^$', views.course_list, name='course_list'),
    url(r'^course/(?P<cd>\d+)/$', views.course_detail, name='course_detail'),
]

完整跟踪

Request Method: GET
Request URL:    https://yr4-group-project-mfblack.c9users.io/
Django Version: 1.9
Exception Type: NoReverseMatch
Exception Value:    
Reverse for 'course_detail' with arguments '()' and keyword arguments '{u'cd': ''}' not found. 1 pattern(s) tried: ['course/(?P<cd>\\d+)/$']
Exception Location: /usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py in _reverse_with_prefix, line 508
Python Executable:  /usr/bin/python
Python Version: 2.7.6
Python Path:    
['/home/ubuntu/workspace',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/usr/lib/python2.7/lib-old',
 '/usr/lib/python2.7/lib-dynload',
 '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages/PILcompat',
 '/usr/lib/python2.7/dist-packages/gtk-2.0',
 '/usr/lib/pymodules/python2.7']
Server time:    Tue, 25 Oct 2016 16:08:46 +0000

希望有人可以提供帮助，因为我已经尝试了所有我能想到的让它工作的东西。如果需要更多代码，请告诉我。

更新： models.py

class Course(models.Model):
    MY_CHOICES = (
        ('Open', 'Open'),
        ('Closed', 'Closed'),
        ('Fully Booked', 'Fully Booked'),
    )
    course_name = models.CharField(max_length=40)
    course_code = models.CharField(max_length=40)
    price = models.CharField(max_length=40, default='add price')
    topic_details = models.TextField(max_length=200)
    start_date = models.DateField('start date')
    end_date = models.DateField('end date')
    status = models.CharField(max_length=20, choices=MY_CHOICES)
    venue = models.ForeignKey(Venue, on_delete=models.CASCADE)
    room = models.CharField(max_length=20)
    def __str__(self):
        return self.course_name

我尝试了您的答案并且它起作用了，我现在正在加载网站，但是现在我单击课程名称时出现此错误：

FieldError at /course/1/
Cannot resolve keyword 'cd' into field. Choices are: course_code, course_name, end_date, id, price, room, start_date, status, student, topic_details, venue, venue_id
Request Method: GET
Request URL:    https://yr4-group-project-mfblack.c9users.io/course/1/
Django Version: 1.9
Exception Type: FieldError
Exception Value:    
Cannot resolve keyword 'cd' into field. Choices are: course_code, course_name, end_date, id, price, room, start_date, status, student, topic_details, venue, venue_id
Exception Location: /usr/local/lib/python2.7/dist-packages/django/db/models/sql/query.py in names_to_path, line 1330
Python Executable:  /usr/bin/python
Python Version: 2.7.6
Python Path:    
['/home/ubuntu/workspace',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/usr/lib/python2.7/lib-old',
 '/usr/lib/python2.7/lib-dynload',
 '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages/PILcompat',
 '/usr/lib/python2.7/dist-packages/gtk-2.0',
 '/usr/lib/pymodules/python2.7']
Server time:    Tue, 25 Oct 2016 17:14:37 +0000
4

1 回答 1

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跟踪日志告诉您它找不到course_detail带有空白捕获组的 url cd。（注意，u指的是 unicode，与您的问题无关。）

您的course_detail网址需要一位或多位数字cd：

r'^course/(?P<cd>\d+)/$'

但它通过了......什么都没有！

'course_detail' with arguments '()' and keyword arguments '{u'cd': ''}'

为什么？因为在您看来，{% url 'course_detail' cd=course.cd %},course.cd是空白的。

我需要查看您的Course模型，但我怀疑您使用简单cd而不是标准id。尝试切换到course.id: 这应该可以解决问题。

更新：

您的第二个错误是由完全相同的问题引起的views.py：

get_object_or_404(Course, cd=cd)

cd这是未定义的：您应该将其更改为id.

于 2016-10-25T16:41:37.463 回答