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我正在研究一個博客項目，並得到「匹配查詢不存在」錯誤。我嘗試過使用try塊，認爲模型類可能不會返回任何值。因此，修改了我的views.py如下： -Django錯誤：匹配查詢不存在
from django.shortcuts import render, HttpResponseRedirect
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.models import User
from django.contrib.auth.hashers import make_password
from django.db.models import Q
from .forms import *
# Create your views here.
def home(request):
print("I am home")
try:
blog_data = BlogPost.objects.all()
print("blog_data", blog_data)
except BlogPost.DoesNotExist:
blog_data = None
print("blog_data", blog_data)
try:
last_element = BlogPost.objects.filter(id = len(blog_data))[0]
print("last_element", last_element)
except BlogPost.DoesNotExist:
last_element = None
print("last_element", last_element)
tags_list = BlogPost.objects.values_list("tags", flat = True).distinct()
#tags_list = BlogPost.objects.all().distinct()
context = {'blog_data':blog_data, "last_element":last_element, "tags_list":tags_list}
#last_element = list(BlogPost.objects.all().reverse()[0])
print("last_element",last_element, "blog_data",blog_data,"context",context)
return render(request, 'blog/home.html', context)
# def home(request):
# blog_data = BlogPost.objects.all()
# context = {'blog_data':blog_data}
# print('context', context)
# last_element = BlogPost.objects.all().reverse()[0]
# #last_element = BlogPost.objects.all().reverse()[0]
# return render(request, 'blog/home.html', context)
def new_post(request):
if request.method == 'POST':
form = BlogForm(data = request.POST)
if form.is_valid():
form.save()
return HttpResponseRedirect('home')
else:
form = BlogForm()
return render(request, 'blog/blogform.html', {'form':form })
def login_user(request):
username = password = ''
state = "Please log in"
if request.POST:
username = request.POST.get('Username')
password = request.POST.get('Password')
user = authenticate(username=username, password=password)
if user is not None:
if user.is_active:
login(request, user)
state = "You're successfully logged in!"
return HttpResponseRedirect('/blog/home')
else:
state = "Your account is not active, please contact the site admin."
else:
state = "Your username and/or password were incorrect."
#return render_to_response('main/login.html',{'state':state, 'username': username})
return render(request, "blog/login.html", {'state':state, 'username': username, 'next_page':"home.html"})
#return HttpResponseRedirect("home.html")
def logout_user(request):
logout(request)
return render(request,'blog/home.html')
def register_user(request):
username = password = password_again = email = ''
state = ''
if request.method == 'POST':
username = request.POST.get('Username')
password = request.POST.get('Password')
password_again = request.POST.get('Password_again')
email = request.POST.get('Email')
print('email', email)
if password == password_again:
password = make_password(password, salt = None, hasher = 'default')
else:
state = "Password and password re-entered do not match, please try again..."
return HttpResponseRedirect('login')
print("at 63")
try:
user = User.objects.get(username = username)
print('user at 67', user)
except Exception as e:
print("Error is :", e)
user = None
print("user", user)
try:
emailID = User.objects.get(email = email)
print("emailID", emailID)
except Exception as e:
print("Error is :", e)
emailID = None
print("emailID exception", emailID)
if user is not None:
state = 'Username already exists, please try another one...'
else:
if emailID is None:
new_user = User(username = username, password = password, email = email)
##Adding new logic for securityQAs vvv
#new_SQA = SecurityQA(user_email = email, security_question = security_question, security_answer = security_answer)
##Adding new logic for securityQAs ^^^
new_user.save()
#new_SQA.save()
state = 'You are successfully registered.. Thanks'
return HttpResponseRedirect('login')
else:
state = "Email ID already registered, try a new one.."
print('state at else', state)
#return HttpResponseRedirect('login')
return render(request, "blog/register.html", {'state':state, 'username':username, 'next_page':'home.html'})
def forgot_password(request):
pass
def comment_posted(request):
return render(request, "blog/comment_posted.html")
def blog_search(request):
qset = Q()
keyword = ''
keyword = request.POST.get('keyword')
print("keyword", keyword)
for word in keyword.split():
qset |= (Q(title__contains = word)|Q(description__contains = word))
print('qset', qset)
result = BlogPost.objects.filter(qset)
context = {'result':result}
return render(request, 'blog/blog_search.html', context)
此外，在下面找到
from django.db import models
from django.contrib.auth.models import User
#from django.core.files.storage import FileSystemStorage
#fs = FileSystemStorage(location='E:\django\myblog\\blog\uploaded images')
# Create your models here.
class BlogPost(models.Model):
title = models.CharField(max_length = 30)
posted_by = models.CharField(max_length = 30)
posted_on = models.DateTimeField(auto_now_add = True)
description = models.CharField(max_length = 200)
comment = models.CharField(max_length = 150)
tags = models.CharField(max_length=50, default = "notag")
image = models.ImageField(upload_to = 'uploaded_images', default = None, null = True, blank = True)
def __str__(self):
#return "{0} : {1}".format(self.title, self.description)
return self.title
模板代碼如下（home.html做爲）我的models.py。在這裏，我正在逐漸線錯誤「{爲blog.blogpost last_element.id％get_comment_list爲comment_list％}」
{% load staticfiles %}
{%load comments%}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<title>Sourav's blog</title>
<!-- Bootstrap Core CSS -->
{%block styling%}
<link href="{%static 'css/bootstrap.min.css'%}" rel="stylesheet">
<!-- Custom CSS -->
<link href="{%static 'css/blog-post.css'%}" rel="stylesheet">
{%endblock styling%}
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<!-- Navigation -->
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Ideate</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li>
<a href="{%url 'blog_new_post'%}">New idea</a>
</li>
<!-- <li><a href="{%url 'blog_login'%}">Login</a></li> -->
{{user.is_authenticated}}
{% if user.is_authenticated %}
<li>
<a href="{%url 'blog_logout'%}">Logout</a>
</li>
{% else %}
<li>
<a href="{%url 'blog_login'%}">Login</a>
</li>
{% endif %}
<li>
<a href="#">Help</a>
</li>
{% if user.is_authenticated %}
<li>
<a href="#">Hi {{user.username}}</a>
</li>
{%else%}
{% endif %}
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container -->
</nav>
<!-- Page Content -->
<div class="container">
<div class="row">
<!-- Blog Post Content Column -->
<div class="col-lg-8">
<!-- Blog Post -->
<!-- Title -->
<h1>Idea Blog</h1>
<!-- Author -->
<p class="lead">
by <a href="#">Sourav</a>
</p>
<hr>
<!-- Date/Time -->
<p><span class="glyphicon glyphicon-time"></span>
Posted on
<!-- {%for i in blog_data%}
{{i.posted_on}}
{%endfor%}</p> -->
{{last_element.posted_on}}
<hr>
<!-- Preview Image -->
<img class="img-responsive" src="http://placehold.it/900x300" alt="">
<hr>
<!-- Post Content -->
<!-- <p>Below is the result</p> -->
<!-- <p>{{blog_data}}</p> -->
<p>
<!-- {%for i in blog_data%}
<h1>{{i.title}}</h1>
<p>{{i.description}}</p>
{%empty%}
<span>No data</span>
{%endfor%} -->
<!-- {{last_element}} -->
<h1>{{last_element.title}}</h1><span> posted by {{last_element.posted_by}}</span>
<p>Description : {{last_element.description}}</p>
{{last_element.image}}
<p>Tags : {{last_element.tags}}</p>
{% get_comment_count for blog.blogpost last_element.id as comment_count %}
<p>{{ comment_count }} comments have been posted.</p>
{% get_comment_list for blog.blogpost 1 as comment_list %}
{% for comment in comment_list %}
<p>Posted by: {{ comment.user_name }} on {{ comment.submit_date }}</p>
<p>Comment: {{ comment.comment }}</p>
{% endfor %}
{% get_comment_form for blog.blogpost last_element.id as form %}
<!-- A context variable called form is created with the necessary hidden
fields, timestamps and security hashes -->
<table>
<form action="{% comment_form_target %}" method="post">
{% csrf_token %}
{{ form }}
<tr>
<td colspan="1">
<input type="submit" name="submit" value="Post">
<input type="submit" name="preview" value="Preview">
<input type="hidden" name="next" value="{% url 'comment_posted' %}" />
</td>
</tr>
</form>
</table>
{% get_comment_list for blog.blogpost last_element.id as comment_list %}
{%for comment in comment_list%}
<li><b>{{comment.name}}</b> has posted comment on {{comment.submit_date}} </li>
<ul><li>{{comment.comment}}</li></ul>
<a name="c{{ comment.id }}"></a>
<a href="{% get_comment_permalink comment %}">
see comment details
</a>
{%endfor%}
</p>
</div>
<div class="col-md-4">
<!-- Blog Search Well -->
<form action = "{%url 'blog_search'%}" method = "POST">
<div class="well">
<h4>Blog Search</h4>
<div class="input-group">
{%csrf_token%}
<input type="text" class="form-control" name = "keyword", placeholder = "Enter search keyword">
<span class="input-group-btn">
<button class="btn btn-default" type="submit">
<span class="glyphicon glyphicon-search"></span>
</button>
</span>
</div>
<!-- /.input-group -->
</div>
</form>
<!-- Blog Categories Well -->
<div class="well">
<h4>Tags</h4>
<div class="row">
<div class="col-lg-6">
<ul class="list-unstyled">
<!-- {%for a in tags_list%}
<a href="">{{a}}</a>
{%endfor%} -->
<!-- {%for a in tags_list%}
<a href="">{{a}}</a>
{%endfor%} -->
{%for a in tags_list%}
<a href="">{{a}},</a>
{%endfor%}
<!-- <li><a href="#">Category Name</a>
</li>
<li><a href="#">Category Name</a>
</li>
<li><a href="#">Category Name</a>
</li>
<li><a href="#">Category Name</a>
</li> -->
</ul>
</div>
<div class="col-lg-6">
<ul class="list-unstyled">
<li><a href="#">Category Name</a>
</li>
<li><a href="#">Category Name</a>
</li>
<li><a href="#">Category Name</a>
</li>
<li><a href="#">Category Name</a>
</li>
</ul>
</div>
</div>
<!-- /.row -->
</div>
<!-- Side Widget Well -->
<div class="well">
<h4>Side Widget Well</h4>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Inventore, perspiciatis adipisci accusamus laudantium odit aliquam repellat tempore quos aspernatur vero.</p>
</div>
</div>
</div>
</div>
</div>
<!-- Blog Sidebar Widgets Column -->
<!-- /.row -->
<hr>
<!-- Footer -->
<footer>
<div class="row">
<div class="col-lg-12">
<p>Copyright © Your Website 2014</p>
</div>
</div>
<!-- /.row -->
</footer>
</div>
<!-- /.container -->
<!-- jQuery -->
{%block javascript%}
<script src="{%static 'js/jquery.js'%}"></script>
<!-- Bootstrap Core JavaScript -->
<script src="{%static 'js/bootstrap.min.js'%}"></script>
{%endblock javascript%}
</body>
</html>
當我裝我的主頁（home.html做爲）我沒有遇到任何問題，但是，當我在登錄後嘗試註銷時，我正面臨錯誤。我的註銷視圖也呈現home.html。但是，在這種情況下，它不起作用。請幫我解決這個問題。我被卡住了。
