python - Django 中的按键错误

Question

我正在创建一个 fiverr.com 的克隆作为一个项目。

我的 base.html 中有一个带有类别标题的标题，如果我单击它，应该只过滤出相关类别中的演出以供显示。

无论如何，它总是重定向到主页。我做了一些测试，认为这应该是因为 KeyError，没有链接被正确传递给函数。

代码如下:

views.py

def category(request, link):

  categories = {
      "Graphics & Design": "GD",
      "Digital & Marketing": "DM",
      "Video & Animation": "VA",
      "Music & Audio": "MA",
      "Programming & Tech": "PT"
  }
  try:
      gigs = Gig.objects.filter(category=categories[link])
      return render(request, 'home.html', {"gigs": gigs})
  except KeyError:
      return redirect('home')

模型.py

class Gig(models.Model):
  CATEGORY_CHOICES = (
      ("GD", "Graphics & Design"),
      ("DM", "Digital & Marketing"),
      ("VA", "Video & Animation"),
      ("MA", "Music & Audio"),
      ("PT", "Programming & Tech")
  )
  title = models.CharField(max_length=500)
  category = models.CharField(max_length = 2, choices=CATEGORY_CHOICES)
  description = models.CharField(max_length=1000)
  price = models.IntegerField(default=6)
  photo = models.FileField(upload_to='gigs')
  status = models.BooleanField(default=True)
  user = models.ForeignKey(User)
  create_time = models.DateTimeField(default=timezone.now)

  def get_absolute_url(self):
      return reverse('my_gigs') 

  def __str__(self):
      return self.title

base.html(链接所在的位置 - 尝试了另一种获取图形与设计相同链接的方法，但结果相似)

<nav class="navbar navbar-light bg-faded">
    <div class="container">
      <ul class="nav navbar-nav">
        <li class="nav-item active">
          <a class="nav-link" href='category/graphics-design'>Graphics &       Design <span class="sr-only">(current)</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="{% url 'category' 'digital-marketing' %}">Digital Marketing</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="{% url 'category' 'video-animation' %}">Video & Animation</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="{% url 'category' 'music-audio' %}">Music & Audio</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="{% url 'category' 'programming-tech' %}">Programming & Tech</a>
        </li>
      </ul>
    </div>
  </nav>

urls.py

url(r'^category/(?P<link>[\w|-]+)/$', views.category, name='category'), 

Answer 1

View 在 link 参数中接收到一个 slug 值。因此，您应该重新定义 categories 字典:

def category(request, link):

  categories = {
    "graphics-design": "GD",
    "digital-marketing": "DM",
    "video-animation": "VA",
    "music-audio": "MA",
    "programming-tech": "PT"
  }
  ...