【发布时间】：2020-06-08 21:56:33
【问题描述】：
当我打开http://127.0.0.1:8000/ 即home.html 时，我得到：
NoReverseMatch at / 和 Reverse for 'exam-detail' with arguments '('',)' 未找到。尝试了 1 种模式：['exam/(?P[^/]+)$']
我认为错误是由于urls.py 中的<str:pk> 造成的。
urls.py 文件如下：
from . import views
from .views import ExamListView, ExamDetailView
app_name='map'
urlpatterns = [
path("", ExamListView.as_view(), name='map-home'),
path("exam/<str:pk>", ExamDetailView.as_view(), name="exam-detail"),
path("login_student/", views.login_student, name='map-login'),
path("register_student", views.register_student, name='map-register'),
path('add_student/', views.add_student, name='add_student'),
path('front/', views.front, name="front"),
]
models.py：
subject = models.TextField(primary_key = True, unique = True)
def __str__(self):
return self.subject
home.html
{% extends "map/base.html" %}
{% block content %}
<p>WELCOME HOME</p>
{% for exam in exams %}
<article class="media content-section">
<div class="media-body">
<div class="article-metadata">
<a class="mr-2" href="{% url 'map:exam-detail' exam.subject %}">{{ exam }} </a>
</div>
</div>
</article>
{% endfor %}
{% endblock content %}
base.html
{% load static %}
<!DOCTYPE html>
<html>
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="{% static 'map/main.css' %}">
{% if title %}
<title>{{ title }}</title>
{% else %}
<title> MAP PAGE </title>
{% endif %}
</head>
<body>
<header class="site-header">
<nav class="navbar navbar-expand-md navbar-dark bg-steel fixed-top">
<div class="container">
<a class="navbar-brand mr-4" href="/">Project M.A.P</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggle" aria-controls="navbarToggle" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarToggle">
<div class="navbar-nav mr-auto">
<a class="nav-item nav-link" href="{% url 'map:map-home' %}">Home</a> <!-- no hardcoded links -->
<a class="nav-item nav-link" href="{% url 'map:map-home' %}">About</a>
</div>
<!-- Navbar Right Side -->
<div class="navbar-nav">
{% if user.is_authenticated %}
<a class="nav-item nav-link" href="{% url 'profile' %}">Profile</a>
<a class="nav-item nav-link" href="{% url 'logout' %}">Logout</a>
{% else %}
<a class="nav-item nav-link" href="{% url 'login' %}">Login</a>
<a class="nav-item nav-link" href="{% url 'register' %}">Register</a>
<a class="nav-item nav-link" href="{% url 'map:map-register' %}">Student</a>
{% endif %}
</div>
</div>
</div>
</nav>
</header>
<main role="main" class="container">
<div class="row">
<div class="col-md-8">
{% if messages %}
{% for message in messages %}
<div class="alert alert-{{ message.tags }}">
{{ message }}
</div>
{% endfor %}
{% endif %}
{% block content %}{% endblock %}
</div>
<div class="col-md-4">
<div class="content-section">
<h3>Our Sidebar</h3>
<p class='text-muted'>You can put any information here you'd like.
<ul class="list-group">
<li class="list-group-item list-group-item-light">Latest Posts</li>
<li class="list-group-item list-group-item-light">Announcements</li>
<li class="list-group-item list-group-item-light">Calendars</li>
<li class="list-group-item list-group-item-light">etc</li>
</ul>
</p>
</div>
</div>
</div>
</main>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>[enter image description here][1]
views.py
from django.shortcuts import render
from django.http import HttpResponse
from django.http import HttpResponseRedirect
from django.urls import reverse
from . models import Student, Exam
from django.views.generic import ListView, DetailView
def home(request):
context = {
'exams': Exam.objects.all()
}
return render(request, 'map/home.html', context)
class ExamListView(ListView): #class based views
model = Exam
template_name = 'map/home.html' #<app>/<model>_<viewtype>.html
context_object_name = 'exams'
ordering = ['subject'] #['-exam']
class ExamDetailView(DetailView):
model = Exam
【问题讨论】：
-
网址
exam-detail未找到。请将此 URL 添加到 urls.py 中，或者如果这无效，请检查进行此调用的代码 -
请在下面的 url 中尝试，看看它是否能解决您的问题。 path("
/", ExamDetailView.as_view(), name="exam-detail"), -
未找到带有参数“('',)' 的“exam-detail”的反向操作。尝试了 1 种模式：['(?P
[^/]+)$'] 这是我的错误。我也试过 path("/", ExamDetailView.as_view(), name="exam-detail") 。问题是由于参数传递不当造成的。但我不知道如何解决它。
标签： python html django django-views django-urls