如何过滤和计算 DJANGO 模板中的对象？

Question

你好我只是想问这个因为我是 django 的新手，我的问题是我想计算有多少评论有 post 并将其放入 html 模板。但问题是我使用 for 收集数据库中的所有事件，但我只想显示包含 "for" 显示的每个事件的评论数。这是我的模型、视图和模板。非常感谢。

型号

class Event(TimeStampModel):
    name = models.CharField(max_length=200, unique=True)
    slug = models.SlugField(editable=False)
    summary = models.TextField(max_length=255)
    content = models.TextField()
    category = models.ForeignKey(Category)
    place = models.CharField(max_length=50)
    start = models.DateTimeField()
    finish = models.DateTimeField()
    image = models.ImageField(upload_to = 'eventos')
    is_free = models.BooleanField(default=True)
    amount = models.DecimalField(max_digits=6, decimal_places=0, default=0) 
    views = models.PositiveIntegerField(default=0)
    organizer = models.ForeignKey(settings.AUTH_USER_MODEL, blank=True, null=True)

    def save(self, *args, **kwargs):
        if not self.id:
            self.slug = slugify(self.name)
        super(Event, self).save(*args, **kwargs)

    def __unicode__(self):
        return self.name

class Comments(TimeStampModel):
    user = models.ForeignKey(settings.AUTH_USER_MODEL)
    event = models.ForeignKey(Event)
    content = models.TextField()

    def __unicode__(self):
        return "%s %s" % (self.user.username, self.event.name)

查看

class IndexView(TemplateView):
    template_name = 'eventos/index.html'
    def get_context_data(self, **kwargs):
        context = super(IndexView, self).get_context_data(**kwargs)
        context['events'] = Event.objects.all().order_by('-created')[:6]
        context['categories'] = Category.objects.all()
        context['comments'] = Comments.objects.all()
        return context

HTML 模板

{% for event in events %}
    <li class="span4 ">
      <div class="thumbnail thumbnail-1">
        <h3 class="titulo-fix" >{{ event.name }}</h3>
          <img class="center-cropped" src="{{ event.image.url }}" alt="">
            <section> 
                <a href="#"><h3>{{ event.category }} </h3></a>
                  <div class="meta">
                        <time datetime="2012-11-09" class="date-1"><i class="icon-calendar"></i> {{ event.start }}</time>
                        <div class="name-author"><i class="icon-user"></i> <a href="#">{{ event.organizer }}</a></div>
                        <a href="#" class="comments"><i class="icon-comment"></i>  comments</a>
                    </div> 
                  <div class="clear"></div>
                  <p>{{ event.place }}</p>
                  <a href="#" class="btn btn-1">Leer mas..</a> 
            </section>
      </div>
    </li>
  {% endfor %}

我只想在 html 中显示评论的那部分显示它。当然有标签，但我只是不知道标签或如何做。

Answer 1

您可以在模型上创建一个辅助方法，它可以帮助您显示评论数。

像这样：

class Event(TimeStampModel):
    ...

    def comments_count(self):
        #Your filter criteria can go here. 
        return self.comments_set.count()

并在评论中：

{{event.comments_count}}

More documentation on the reverse lookups can be found here

如果你不过滤，就像@MadWombat 提到的那样，你可以这样做

{{event.comments_set.count}}

如何过滤和计算 DJANGO 模板中的对象？

How can I filter and count objects in DJANGO template?

python

django

class

function

models