Django -基于类别的正确重定向

Question

我有两个问题：

编辑：

我做了一些调整，部分解决了这个问题。但现在，当我提交一个新的博客帖子表单时，它会把我带到错误的url，无论我尝试什么url，我都找不到完整的帖子。当我点击完整帖子的链接时，我得到一个类型错误"Object " post“is not iterable”。"progresstracker“类别工作得很好，”blogtopic/..“不会的。

下面是最新的代码：

views.py

def pt_detail(request, slug, category):
    post = get_object_or_404(Post, slug=slug, category__slug=category)

    template = CATEGORY_TEMPLATES.get(post.category.slug)
    return render(request, template, {'post': post})


def bt_detail(request, slug, category):
    post = get_object_or_404(Post, slug=slug, category__slug=category)
    template = CATEGORY_TEMPLATES.get(post.category.slug)
    return render(request, template, {'post': post})

def post_new(request):
    if request.method == "POST":
        form = PostForm(request.POST)
        if form.is_valid():
            post = form.save(commit=False)
            post.author = request.user
            post.published_date = timezone.now()
            post.save()
            if post.category.slug == 'blog-topics':
                return redirect('bt_detail', slug=post.slug, category=post.category)
            else:
                return redirect('pt_detail', slug=post.slug, category=post.category)
    else:
        form = PostForm()
    return render(request, 'blog/post_edit.html', {'form': form})

def post_edit(request, slug, category):
    post = get_object_or_404(Post, slug=slug, category__slug=category)
    if request.method == "POST":
        form = PostForm(request.POST, instance=post)
        if form.is_valid():
            post = form.save(commit=False)
            post.author = request.user
            post.published_date = timezone.now()
            post.save()
            if post.category.slug == 'blog-topics':
                return redirect('bt_detail', slug=post.slug, category=post.category)
            else:
                return redirect('pt_detail', slug=post.slug, category=post.category)
    else:
        form = PostForm(instance=post)
    return render(request, 'blog/post_edit.html', {'form': form})

urls.py

urlpatterns = [
    url(r'^admin/', include(admin.site.urls)),
    url(r'^home/$', views.home, name='home'),
    url(r'^blogtopics/computer-science/$', views.compsci, name='computer-science'),
    url(r'^blogtopics/data-science/$', views.datasci, name='data-science'),
    url(r'^blogtopics/other/$', views.other, name='other'),
    url(r'^blogtopics/$', views.blogtopics, name='blogtopics'),
    url(r'^resources/$', views.resources, name='resources'),
    url(r'^new/$', views.post_new, name='post_new'),
    url(r'^progresstracker/$', views.progresstracker, name='progresstracker'),
    url(r'^blogtopics/(?P<category>[\w-]+)/(?P<slug>[\w-]+)/$', views.bt_detail, name='bt_detail'),
    url(r'^blogtopics/(?P<category>[\w-]+)/(?P<slug>[\w-]+)/edit/$', views.post_edit, name='post_edit'),
    url(r'^(?P<category>[\w-]+)/(?P<slug>[\w-]+)/$', views.pt_detail, name='pt_detail'),
    url(r'^(?P<category>[\w-]+)/(?P<slug>[\w-]+)/edit/$', views.post_edit, name='post_edit'),
]

computerscience.html

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

{% block nav %}
    <li><a href="/home">Home</a></li>
    <li><a href="/progresstracker">Progress Tracker</a></li>
    <li class="dropdown">
        <a class="active" href="/blogtopics" class="dropbtn">Blog Topics</a>
        <div class="dropdown-content">
            <a href="/blogtopics/computer-science">Computer Science</a>
            <a href="/blogtopics/data-science">Data Science</a>
            <a href="/blogtopics/other">Other</a>
        </div>
    </li>
    <li><a href="/resources">Resources</a></li>
{% endblock %}


{% block content %}
  <div id="content">
                <div class="padding">
                <p style="padding-top: 50px"> 
                <div class="post_list">
            {% for post in post %}  
                <h3><a href="{{ post.get_absolute_url_bt }}">{{ post.title }}</a></h3>
                <p>{{ post.published_date }}</p>
            {% endfor %}
                </div>
                </div>
            </div>
{% endblock %}

models.py

class Post(models.Model):
    title = models.CharField(max_length=100, unique=True)
    slug = models.SlugField(max_length=100, unique=True)
    body = models.TextField()
    posted = models.DateField(db_index=True, auto_now_add=True)
    category = models.ForeignKey('books.Category', related_name='%(class)s_slug')
    created_date = models.DateTimeField(
        default = timezone.now)
    published_date = models.DateTimeField(
        blank=True, null=True)

    def publish(self):
        self.published_date = timezone.now()
        self.save()

    def __unicode__(self):
        return '%s' % self.title

    def get_absolute_url(self):
        return "/%s/%s/" % (self.category, self.slug)

    def get_absolute_url_bt(self):
        return "/blogtopics/%s/%s/" % (self.category, self.slug)

Answer 1

看起来你有几件事要做。首先，您说任何类别都会被发送到一个空白的计算机科学页面。这告诉我，您的if语句总是导致false，所以它试图呈现computerscience.html模板。pt_detail视图在上下文中只有一个Post对象(ptpost)。compsci视图使用相同的computerscience.html模板在上下文中使用posts呈现Post对象的QuerySet。你不能两者兼而有之。因为您的模板在上下文中需要posts，并且只找到ptpost，所以它不能呈现任何内容，因此出现了空白页面。

至于使用category来确定要使用的模板，您可以使用一系列elif语句，也可以这样做：

CATEGORY_TEMPLATES = {
    'progresstracker': 'blog/pt_detail.html',
    'anothercategory': 'blog/ac_detail.html',
    'yetanothercategory': 'blog/yac_detail.html',
}

def pt_detail(request, slug, category):
    ptpost = get_object_or_404(Post, slug=slug, category__slug=category)
    template = CATEGORY_TEMPLATES.get(ptpost.category.slug, 'blog/default_detail.html')
    return render(request, template, {'ptpost': ptpost})

这将从CATEGORY_TEMPLATES字典中选择类别，如果当前类别不在字典中，则使用blog/default_detail.html作为默认值。