(DJANGO) post/<slug:slug> 处的 NoReverseMatch
(DJANGO) NoReverseMatch at post/<slug:slug>
我正在尝试在我的 Django 博客中实现评论表单。我正在阅读本教程(https://djangocentral.com/creating-comments-system-with-django/),但最后发生了错误。错误页面显示:
NoReverseMatch at /post/firstpost/
Reverse for 'user-posts' with arguments '('',)' not found. 1
pattern(s) tried: ['user\/(?P[^/]+)$']
urls.py
from django.urls import path
from django.conf.urls import include, url
from . import views
from .views import PostListView, PostDetailView, PostCreateView, PostUpdateView, PostDeleteView, UserPostListView
urlpatterns = [
#Blog section
path("", PostListView.as_view(), name='blog-home'),
path("user/<str:username>", UserPostListView.as_view(), name='user-posts'),
path('post/<slug:slug>/', views.post_detail, name='post-detail'),
path("posts/new/", PostCreateView.as_view(), name='post-create'),
path("post/<slug:slug>/update/", PostUpdateView.as_view(), name='post-update'),
path("post/<slug:slug>/delete/", PostDeleteView.as_view(), name='post-delete'),
path("about/", views.about, name="blog-about"),
path("<category>/", views.blog_category, name="blog_category"),
]
models.py
class Comment(models.Model):
post = models.ForeignKey(Post,on_delete=models.CASCADE,related_name='comments')
name = models.CharField(max_length=80)
email = models.EmailField()
body = models.TextField()
created_on = models.DateTimeField(auto_now_add=True)
active = models.BooleanField(default=False)
class Meta:
ordering = ['created_on']
def __str__(self):
return 'Comment {} by {}'.format(self.body, self.name)
forms.py
from .models import Comment
from django import forms
class CommentForm(forms.ModelForm):
class Meta:
model = Comment
fields = ('name', 'email', 'body')
admin.py
from django.contrib import admin
from .models import Post, Category, Comment
class CategoryAdmin(admin.ModelAdmin):
pass
@admin.register(Comment)
class CommentAdmin(admin.ModelAdmin):
list_display = ('name', 'body', 'post', 'created_on', 'active')
list_filter = ('active', 'created_on')
search_fields = ('name', 'email', 'body')
actions = ['approve_comments']
def approve_comments(self, request, queryset):
queryset.update(active=True)
admin.site.register(Post)
admin.site.register(Category, CategoryAdmin)
views.py
def post_detail(request, slug):
template_name = 'blog/post_detail.html'
post = get_object_or_404(Post, slug=slug)
comments = post.comments.filter(active=True)
new_comment = None
# Comment posted
if request.method == 'POST':
comment_form = CommentForm(data=request.POST)
if comment_form.is_valid():
# Create Comment object but don't save to database yet
new_comment = comment_form.save(commit=False)
# Assign the current post to the comment
new_comment.post = post
# Save the comment to the database
new_comment.save()
else:
comment_form = CommentForm()
return render(request, template_name, {'post': post,
'comments': comments,
'new_comment': new_comment,
'comment_form': comment_form})
post_detail.html
{% extends 'blog/base.html' %}
{% block content %}
<article class="media content-section">
<img class="rounded-circle article-img" src="{{ object.author.profile.image.url }}" alt="">
<div class="article-metadata">
<a class="mr-2 author_title" href="{% url 'user-posts' object.author.username %}">@{{ object.author }}</a>
<small class="text-muted">{{ object.date_posted|date:"N d, Y" }}</small>
<div>
<!-- category section -->
<small class="text-muted">
Categories:
{% for category in post.categories.all %}
<a href="{% url 'blog_category' category.name %}">
{{ category.name }}
</a>
{% endfor %}
</small>
</div>
{% if object.author == user %}
<div>
<a class='btn btn-secondary btn-sm mt-1 mb-1' href="{% url 'post-update' object.slug %}">Update</a>
<a class='btn btn-danger btn-sm mt-1 mb-1' href="{% url 'post-delete' object.slug %}">Delete</a>
</div>
{% endif %}
</div>
</article>
<article class="media content-section">
<div class="media-body">
<img class="img-fluid center" id="rcorners3" src="{{ object.image.url }}" alt="none">
<h2 class="article-title text-center">{{ object.title }}</h2>
<p class="article-content">{{ object.content }}</p>
</div>
</article>
<article class="media content-section">
<div class="card-body">
<!-- comments -->
<h2>{{ comments.count }} comments</h2>
{% for comment in comments %}
<div class="comments" style="padding: 10px;">
<p class="font-weight-bold">
{{ comment.name }}
<span class=" text-muted font-weight-normal">
{{ comment.created_on }}
</span>
</p>
{{ comment.body | linebreaks }}
</div>
{% endfor %}
</div>
<div class="col-md-8 card mb-4 mt-3 ">
<div class="card-body">
{% if new_comment %}
<div class="alert alert-success" role="alert">
Your comment is awaiting moderation
</div>
{% else %}
<h3>Leave a comment</h3>
<form method="post" style="margin-top: 1.3em;">
{{ comment_form.as_p }}
{% csrf_token %}
<button type="submit" class="btn btn-primary btn-lg">Submit</button>
</form>
{% endif %}
</div>
</article>
{% endblock content %}
需要帮助。
编辑
将href="{% url 'user-posts' object.author.username %}
改成href="{% url 'user-posts' post.author.username %}
后的结果(post本身没有显示,我也看不到作者,但评论区效果很好。)
在您的 urls.py 定义中,
使用
path("user/<slug:username>", UserPostListView.as_view(), name='user-posts')
而不是
path("user/<str:username>", UserPostListView.as_view(), name='user-posts')
取决于document:
- str - Matches any non-empty string, excluding the path separator, '/'. This is the default if a converter isn’t included in the expression.
- slug - Matches any slug string consisting of ASCII letters or numbers, plus the hyphen and underscore characters. For example, building-your-1st-django-site.
问题是您的模板 post_detail.html 需要一个名为 object
的实例,而您的视图 post_detail
正在提供名称为 post
的实例。以一种或另一种方式解决这些问题,您的问题应该会解决。
我正在尝试在我的 Django 博客中实现评论表单。我正在阅读本教程(https://djangocentral.com/creating-comments-system-with-django/),但最后发生了错误。错误页面显示:
NoReverseMatch at /post/firstpost/
Reverse for 'user-posts' with arguments '('',)' not found. 1 pattern(s) tried: ['user\/(?P[^/]+)$']
urls.py
from django.urls import path
from django.conf.urls import include, url
from . import views
from .views import PostListView, PostDetailView, PostCreateView, PostUpdateView, PostDeleteView, UserPostListView
urlpatterns = [
#Blog section
path("", PostListView.as_view(), name='blog-home'),
path("user/<str:username>", UserPostListView.as_view(), name='user-posts'),
path('post/<slug:slug>/', views.post_detail, name='post-detail'),
path("posts/new/", PostCreateView.as_view(), name='post-create'),
path("post/<slug:slug>/update/", PostUpdateView.as_view(), name='post-update'),
path("post/<slug:slug>/delete/", PostDeleteView.as_view(), name='post-delete'),
path("about/", views.about, name="blog-about"),
path("<category>/", views.blog_category, name="blog_category"),
]
models.py
class Comment(models.Model):
post = models.ForeignKey(Post,on_delete=models.CASCADE,related_name='comments')
name = models.CharField(max_length=80)
email = models.EmailField()
body = models.TextField()
created_on = models.DateTimeField(auto_now_add=True)
active = models.BooleanField(default=False)
class Meta:
ordering = ['created_on']
def __str__(self):
return 'Comment {} by {}'.format(self.body, self.name)
forms.py
from .models import Comment
from django import forms
class CommentForm(forms.ModelForm):
class Meta:
model = Comment
fields = ('name', 'email', 'body')
admin.py
from django.contrib import admin
from .models import Post, Category, Comment
class CategoryAdmin(admin.ModelAdmin):
pass
@admin.register(Comment)
class CommentAdmin(admin.ModelAdmin):
list_display = ('name', 'body', 'post', 'created_on', 'active')
list_filter = ('active', 'created_on')
search_fields = ('name', 'email', 'body')
actions = ['approve_comments']
def approve_comments(self, request, queryset):
queryset.update(active=True)
admin.site.register(Post)
admin.site.register(Category, CategoryAdmin)
views.py
def post_detail(request, slug):
template_name = 'blog/post_detail.html'
post = get_object_or_404(Post, slug=slug)
comments = post.comments.filter(active=True)
new_comment = None
# Comment posted
if request.method == 'POST':
comment_form = CommentForm(data=request.POST)
if comment_form.is_valid():
# Create Comment object but don't save to database yet
new_comment = comment_form.save(commit=False)
# Assign the current post to the comment
new_comment.post = post
# Save the comment to the database
new_comment.save()
else:
comment_form = CommentForm()
return render(request, template_name, {'post': post,
'comments': comments,
'new_comment': new_comment,
'comment_form': comment_form})
post_detail.html
{% extends 'blog/base.html' %}
{% block content %}
<article class="media content-section">
<img class="rounded-circle article-img" src="{{ object.author.profile.image.url }}" alt="">
<div class="article-metadata">
<a class="mr-2 author_title" href="{% url 'user-posts' object.author.username %}">@{{ object.author }}</a>
<small class="text-muted">{{ object.date_posted|date:"N d, Y" }}</small>
<div>
<!-- category section -->
<small class="text-muted">
Categories:
{% for category in post.categories.all %}
<a href="{% url 'blog_category' category.name %}">
{{ category.name }}
</a>
{% endfor %}
</small>
</div>
{% if object.author == user %}
<div>
<a class='btn btn-secondary btn-sm mt-1 mb-1' href="{% url 'post-update' object.slug %}">Update</a>
<a class='btn btn-danger btn-sm mt-1 mb-1' href="{% url 'post-delete' object.slug %}">Delete</a>
</div>
{% endif %}
</div>
</article>
<article class="media content-section">
<div class="media-body">
<img class="img-fluid center" id="rcorners3" src="{{ object.image.url }}" alt="none">
<h2 class="article-title text-center">{{ object.title }}</h2>
<p class="article-content">{{ object.content }}</p>
</div>
</article>
<article class="media content-section">
<div class="card-body">
<!-- comments -->
<h2>{{ comments.count }} comments</h2>
{% for comment in comments %}
<div class="comments" style="padding: 10px;">
<p class="font-weight-bold">
{{ comment.name }}
<span class=" text-muted font-weight-normal">
{{ comment.created_on }}
</span>
</p>
{{ comment.body | linebreaks }}
</div>
{% endfor %}
</div>
<div class="col-md-8 card mb-4 mt-3 ">
<div class="card-body">
{% if new_comment %}
<div class="alert alert-success" role="alert">
Your comment is awaiting moderation
</div>
{% else %}
<h3>Leave a comment</h3>
<form method="post" style="margin-top: 1.3em;">
{{ comment_form.as_p }}
{% csrf_token %}
<button type="submit" class="btn btn-primary btn-lg">Submit</button>
</form>
{% endif %}
</div>
</article>
{% endblock content %}
需要帮助。
编辑
将href="{% url 'user-posts' object.author.username %}
改成href="{% url 'user-posts' post.author.username %}
后的结果(post本身没有显示,我也看不到作者,但评论区效果很好。)
在您的 urls.py 定义中, 使用
path("user/<slug:username>", UserPostListView.as_view(), name='user-posts')
而不是
path("user/<str:username>", UserPostListView.as_view(), name='user-posts')
取决于document:
- str - Matches any non-empty string, excluding the path separator, '/'. This is the default if a converter isn’t included in the expression.
- slug - Matches any slug string consisting of ASCII letters or numbers, plus the hyphen and underscore characters. For example, building-your-1st-django-site.
问题是您的模板 post_detail.html 需要一个名为 object
的实例,而您的视图 post_detail
正在提供名称为 post
的实例。以一种或另一种方式解决这些问题,您的问题应该会解决。