在另一个 Django 应用程序中使用数据

Question

我有一个 Django 博客站点。它包含两个应用程序：blog 和 pages。

博客应用列出所有博客项目如下：

models.py：

class News(models.Model):
    title = models.CharField(max_length=255)
    body = models.TextField()
    date = models.DateTimeField(auto_now_add=True)
    author = models.ForeignKey(
        get_user_model(),
        on_delete=models.CASCADE,
    )
    thumb = models.ImageField(blank=True, null=True)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('news_detail', args=[str(self.id)])

views.py

class NewsListView(ListView):
    model = News
    template_name = 'news_list.html'

news_list.html

{% extends 'base.html' %}

{% block title %}News{% endblock title %}

{% block content %}
  {% for news in object_list %}
    <div class="card" style="width: 300px; display: inline-block; margin: 5px; vertical-align: top;">
       <div class="card-header">
        <span class="font-weight-bold">
          <a href="{% url 'news_detail' news.pk %}" style="color:black">{{ news.title }}</a>
        </span> &middot;
        <span class="text-muted">by {{ news.author }} | {{ news.date }}</span>
      </div>
      <div class="card-body">
        {% if news.thumb %}
          <p align="center"><img src="{{ news.thumb.url }}" /></p>
        {% endif %}
        <p>{{ news.body | linebreaks | truncatewords:30 }}
          <a href="{% url 'news_detail' news.pk %}">Full story</a></p>
      </div>
      <div class="card-footer">
        {% if user.is_authenticated %}
          <a href="{% url 'news_edit' news.pk %}">Edit</a>
          <a href="{% url 'news_delete' news.pk %}">Delete</a>
        {% endif %}
      </div>
    </div>
  {% endfor %}
{% endblock content %}

我的页面应用有 home.html：

{% extends 'base.html' %}

{% block title %}Home{% endblock title %}

{% block content %}
    <div class="jumbotron">
        <h1 class="display-4">Lakeland Cycle Club</h1>
        <p class="lead">The home of cycling in Fermanagh.</p>
        <p class="lead">
            <a class="btn btn-primary btn-lg" href="{% url 'news_list' %}" role="button">View All Club News</a>
        </p>
    </div>
{% endblock content %}

views.py：

class HomePageView(TemplateView):
    template_name = 'home.html'

我的页面中没有模型。

有什么方法可以使用我的博客应用程序中的NewsListView 在我的主页中显示最近的 3 个条目，或者我必须在我的页面应用程序中创建一个类似的模型和视图才能获取博客条目？

我试过了：

pages/views.py

from news.models import News

class HomePageView(TemplateView):
    model = News
    template_name = 'home.html'
    queryset = News.objects.order_by('-date')[:3]

home.html

{% extends 'base.html' %}

{% block title %}Home{% endblock title %}

{% block content %}
    <div class="jumbotron">
        <h1 class="display-4">Lakeland Cycle Club</h1>
        <p class="lead">The home of cycling in Fermanagh.</p>
        <p class="lead">
            <a class="btn btn-primary btn-lg" href="{% url 'news_list' %}" role="button">View All Club News</a>
        </p>
         <span class="font-weight-bold">
          <a href="{% url 'news_detail' news.pk %}" style="color:black">{{ news.title }}</a>
        </span>
    </div>
{% endblock content %}

但是，当我尝试访问主页时，我得到了这个：

File "/Users/paulcarron/.local/share/virtualenvs/lakelandcc-6nBitmwo/lib/python3.7/site-packages/django/urls/resolvers.py", line 622, in _reverse_with_prefix
raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'news_detail' with arguments '('',)' not found. 1 pattern(s) tried: ['news/(?P<pk>[0-9]+)/$']

我认为这来自于我的 news/models.py：

    def get_absolute_url(self):
        return reverse('news_detail', args=[str(self.id)])

Answer 1

你快到了。试试这个：

views.py

from news.models import News
from django.shortcuts import render

def HomePageView(request):
    context = {}
    news = News.objects.order_by('-date')[:3]  
    context['news']=news 
    return render(request,'home.html',context)

home.html

    {% extends 'base.html' %}

    {% block title %}Home{% endblock title %}

    {% block content %}
        <div class="jumbotron">
            <h1 class="display-4">Lakeland Cycle Club</h1>
            <p class="lead">The home of cycling in Fermanagh.</p>
            <p class="lead">
                <a class="btn btn-primary btn-lg" href="{% url 'news_list' %}" role="button">View All Club News</a>
            </p>
             <span class="font-weight-bold">
               {%for new in news%}
{{new.title}}
{%endfor%}
            </span>
        </div>
    {% endblock content %}