找不到页面 (404) - 没有 Post 匹配给定的查询

Question

我正在开发 Django 博客，并为 post 标题实现了 slug 我偶然发现了一个问题。
错误是

Page not found (404)
Request Method: GET
Request URL: http://localhost:8000/post/new/
Raised by: blog.views.post_detail

No Post matches the given query.

这是我的urls.py

from django.conf.urls import include, url
from . import views
from django.conf import settings
from django.conf.urls.static import static

urlpatterns = [
    url(r'^$', views.post_list),
    url(r'^register', views.register),
    url(r'^activate/(?P<activation_key>\w+)/', views.register_confirm),
    url(r'^email_check', views.email_check),
    url(r'^password_check', views.password_check),
    url(r'^login', views.login),
    url(r'^edit/$', views.update_profile),
    url(r'^post/(?P<slug>[-_\w]+)/$', views.post_detail),
    url(r'^post/new/$', views.post_new, name='post_new'),
    url(r'^post/(?P<slug>[-_\w]+)/edit/$', views.post_edit, name='post_edit'),
    url(r'^drafts/$', views.post_draft_list, name='post_draft_list'),
    url(r'^post/(?P<slug>[-_\w]+)/publish/$', views.post_publish, name='post_publish'),
    url(r'^post/(?P<slug>[-_\w]+)/remove/$', views.post_remove, name='post_remove'),
    url(r'^post/(?P<slug>[-_\w]+)/comment/$', views.add_comment_to_post, name='add_comment_to_post'),
    url(r'^comment/(?P<slug>[-_\w]+)/approve/$', views.comment_approve, name='comment_approve'),
    url(r'^comment/(?P<slug>[-_\w]+)/remove/$', views.comment_remove, name='comment_remove'),
] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

view.py文件

@login_required
def post_new(request):
    if request.method == "POST":
        form = PostForm(request.POST)
        if form.is_valid():
            post = form.save()
            post.author = request.user
            post.published_date = timezone.now()
            post.save()
            return redirect('blog.views.post_detail', slug=post.slug)
    else:
        form = PostForm()
    return render(request, 'blog/post_new.html', {'form': form})

说是"post_detail"报错，所以这里是

def post_detail(request, slug):
    post = get_object_or_404(Post, slug=slug)
    return render(request, 'blog/post_detail.html', {'post': post})

我错过了什么？

Answer 1

这是因为 new 匹配正则表达式 [-_\w]+。

您必须重新排序 url 模式中的 url 个条目

改变这个：

url(r'^post/(?P<slug>[-_\w]+)/$', views.post_detail),
url(r'^post/new/$', views.post_new, name='post_new'),

有了这个：

url(r'^post/new/$', views.post_new, name='post_new'),
url(r'^post/(?P<slug>[-_\w]+)/$', views.post_detail),

解释：

代码中的 post_detail url 条目在 post_new url 之前计算。这使 post_detail 优先于 post_new。

因为 post_detail url 是 /post/ + 任何匹配 [-_\w]+ 和 new 匹配正则表达式的东西，Django 认为您将 new 作为 slug 传递给 post_detail 视图，并将其作为关键字参数传递给视图。由于没有 post 和 new 作为 slug，视图 returns 404 Not found.

当 post_new 高于 post_detail 时，/post/new/ 指向 post_new 视图并且 /post/ + 任何具有正则表达式匹配的内容指向 post_detal .

找不到页面 (404) - 没有 Post 匹配给定的查询

Page not found (404) - No Post matches the given query

django

django-urls