Django Url NoReverseMatch，反向找不到关键参数

Question

我遇到URl映射问题。我希望帖子的标题位于网址中，并且在尝试执行此操作时出现NoReverseMatch错误。

这是app / urls.py文件

from django.conf.urls import url
from .views import PostsListView, PostDetailView

app_name = 'era'

urlpatterns = [
    url(r'^$', PostsListView.as_view(), name='posts_list'),
    url(r'^post/(?P<title>[\w-]+)/$', PostDetailView.as_view, 
    name='post_details')
]

应用程序/ views.py

from django.shortcuts import render
from django.views.generic import ListView, DetailView
from .models import Post


class PostsListView(ListView):
    model = Post


class PostDetailView(DetailView):
    model = Post
    context_object_name = 'post_details'
    template_name = 'era/post_details.html'

最后是era / post_list.html

{% extends 'era/base.html' %}

{% block content %}
{% for post in post_list %}
    <div class="post-block" style="width: 27%;float: left; margin: 3%; background-color: rgba(169, 169,169,0.5); padding: 2%; border-radius: 15px">
        <h3>{{ post.title }}</h3>
        <br>
        {{ post.image_title }}
        <br>
        {{ post.short_description }}
        <br><br>
        <a href="{% url 'era:post_details' title=post.title %}" class="btn btn-primary" style="float: right">Read more</a>
    </div>
{% endfor %}
{% endblock %}

非常感谢您的帮助！