Django 博客 url 错误 NoReverseMatch at /

如何解决Django 博客 url 错误 NoReverseMatch at /

当我出现这个错误 home.html 页面但用户发布页面的 url 在其他页面中工作正常时 但在主页我收到此错误

未找到参数为 '('',)' 的 'user-posts' 反向。尝试了 1 个模式：['user/(?P[^/]+)/$']

我不知道他们是否需要我的东西，但在 home.html 中让我访问 post.author.usernname

home.html

{% extends "blog/base.html" %}
{% block content %}
    <h1>Blog Home!</h1>
    {% for post in posts %}
        <article class="media content-section">
            <img class = "rounded-circle article-img" src = "{{ post.author.profile.image.url }}">
            <div class="media-body">
            <div class="article-Metadata">
                <a class="mr-2" href="{% url 'user-posts' post.author.username %}">{{ post.author }}</a>
                <small class="text-muted">{{ post.date_posted|date:"F d,Y" }}</small>
            </div>
            <h2><a class="article-title" href="{% url 'post-detail' post.id %}">{{ post.title }}</a></h2>
            <p class="article-content">{{ post.content }}</p>
            </div>
        </article>
    {% endfor %}
    {% if is_paginated %}

        {% if page_obj.has_prevIoUs %}
            <a class = "btn btn-outline-info mb-4" href="?page=1">First</a>
            <a class = "btn btn-outline-info mb-4" href="?page={{ page_obj.prevIoUs_page_number }}">PrevIoUs</a>  
        {% endif %}

        {% for num in page_obj.paginator.page_range %}
            {% if page_obj.number == num %}
                <a class = "btn btn-info mb-4" href="?page={{ num }}">{{ num }}</a>
            {% elif num > page_obj.number|add:'-4' and num < page_obj.number|add:'4' %}
                <a class = "btn btn-outline-info mb-4" href="?page={{ num }}">{{ num }}</a>
            {% endif %}

        {% endfor %}

        {% if page_obj.has_next %}
            <a class = "btn btn-outline-info mb-4" href="?page={{ page_obj.next_page_number }}">Next</a>
            <a class = "btn btn-outline-info mb-4" href="?page={{ page_obj.paginator.num_pages }}">Last</a>  
        {% endif %}


    {% endif %}
{% endblock %}

url.py

from django.urls import path
from .views import (
    PostListView,PostDetailView,PostCreateView,PostUpdateView,PostDeleteView,UserPostListView
)
from . import views

urlpatterns = [
    path('',PostListView.as_view(),name= "blog-home"),path('user/<str:username>/',UserPostListView.as_view(),name= "user-posts"),path('post/<int:pk>/',PostDetailView.as_view(),name= "post-detail"),path('post/new/',PostCreateView.as_view(),name= "post-create"),path('post/<int:pk>/update/',PostUpdateView.as_view(),name= "post-update"),path('post/<int:pk>/delete/',PostDeleteView.as_view(),name= "post-delete"),path('about/',views.about,name= "blog-about"),]

 

views.py

from django.shortcuts import render,get_object_or_404
from django.contrib.auth.models import User
from django.contrib.auth.mixins import LoginrequiredMixin,UserPassesTestMixin
from django.views.generic import (
    ListView,DetailView,CreateView,UpdateView,DeleteView
)
from .models import Post

def home(request):
    content = {
        'posts':Post.objects.all()
    }    
    return render(request,'blog/home.html',content)

class PostListView(ListView):
    model = Post
    template_name = 'blog/home.html'
    context_object_name = 'posts'
    ordering = ['-date_posted']
    paginate_by = 5

class UserPostListView(ListView):
    model = Post
    template_name = 'blog/user_posts.html'
    context_object_name = 'posts'
    paginate_by = 5

    def get_queryset(self):
        user = get_object_or_404(User,username = self.kwargs.get('username'))
        return Post.objects.filter(author = user).order_by('-date_posted')


class PostDetailView(DetailView):
    model = Post

class PostCreateView(LoginrequiredMixin,CreateView):
    model = Post
    fields = ['title','content']

    def form_valid(self,form):
        form.instance.author = self.request.user
        return super().form_valid(form)

class PostUpdateView(LoginrequiredMixin,UserPassesTestMixin,UpdateView):
    model = Post
    fields = ['title',form):
        form.instance.author = self.request.user
        return super().form_valid(form)
    def test_func(self):
        post = self.get_object()
        if self.request.user == post.author:
            return True
        return False

class PostDeleteView(LoginrequiredMixin,DeleteView):
    model = Post
    success_url = '/'

    def test_func(self):
        post = self.get_object()
        if self.request.user == post.author:
            return True
        return False


def about(request):
    return render(request,'blog/about.html',{'title': 'About'})

models.py

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
from django.urls import reverse

class Post(models.Model):
    title = models.CharField(max_length = 100)
    content = models.TextField()
    date_posted = models.DateTimeField(default=timezone.Now)
    author = models.ForeignKey(User,on_delete = models.CASCADE,db_constraint=False)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('post-detail',kwargs = {'pk':self.pk})