Why I Get NoReverseMatch at Error // Reverse for 'post-detail' with arguments '('',)' not found

Question

I could not find the cause of the error.

Urls.py:

path('', views.post_list, name="post_list"),
path('<str:url_sistem>/', views.post_detail, name='post-detail'),

Views.py:

def post_detail(request, url_sistem):
url_sistem = Post.objects.get(title)
posts = get_object_or_404(Post, url_sistem=url_sistem)
return render(request, 'blog/post_detail.html', {'posts':posts})

A href link:

<a href="{% url 'post-detail' post.url_sistem %}" style="color:black;">

Answer 1

You have an indentation error that needs to be fixed:

def post_detail(request, url_sistem):
    url_sistem = Post.objects.get(title)
    posts = get_object_or_404(Post, url_sistem=url_sistem)
    return render(request, 'blog/post_detail.html', {'posts':posts})

in the template:

<a href="{% url 'blog:post-detail' post.url_sistem %}" style="color:black;">

Answer 2

它应该像<a href="{% url 'projectAppName:post-detail' post.url_sistem %}" style="color:black;">