Django URL 调度员 - 尝试下一个视图

Question

好吧，让我给你们举个例子；

我们在Django中有如下url配置。

Django 将尝试将 url 与下面的规则匹配。 一旦找到匹配项，它将使用适当的视图并在 model 中查找 object。

问题是，一旦它在 URL 模式中找到匹配项，它就会匹配视图。 但是一旦找不到视图中的object，就会返回页面未找到（404）错误。

网址.py

from django.urls import path

from . import views

urlpatterns = [
    path('articles/<slug:category>/<slug:editor>/', views.ArticleByThemeView.as_view(), name='articles_by_editor'),
    path('articles/<slug:category>/<slug:theme>/', views.ArticleDetailView.as_view(), name='articles_by_theme')
]

视图.py

class ArticleByThemeView(ListView):
    """
    List all articles by a certain theme; "World War 2".
    """
    model = Article
    
    def dispatch(self, request, *args, **kwargs):
        try:
            # Check if the theme_slug matches a theme
            theme = ArticleTheme.objects.get(slug=self.kwargs['theme_slug'])
        except ArticleTheme.DoesNotExist:
            # Theme does not exist, slug must be an article_slug
            return redirect(
                'article_detail',
                category_slug=category_slug
                article_slug=theme_slug
            )
        return super().dispatch(request, *args, **kwargs)

class ArticleDetailView(DetailView):
    """
    Detailview for a certain article
    """
    model = Article

    def get_object(self):
        return get_object_or_404(
            Article,
            category__slug=self.kwargs['category_slug'],
            slug=self.kwargs['article_slug']
        )

我们有以下 url 模式，我们可以按编辑或主题对文章进行排序。 我们这样做是为了 SEO 目的创建逻辑 url 结构。

一旦找不到 object，我们是否可以通过任何方式重定向到另一个视图？

能否修改dispatch方法返回url模式，找到如下匹配规则？

Answer 1

这样的重定向怎么样：

def articles_by_editor(request, category, editor):
    try:
        article = Article.objects.get(category=category, editor=editor)
        # return article
    except Article.DoesNotExist:
        # redirect to another view
        return redirect('articles_by_theme', category=category)

Answer 2

好吧，

根据 Sunderam Dubey 的建议，我写了一个 function 视图，它使用两条不同的路由到同一视图。

网址.py

from django.urls import path

from . import views

urlpatterns = [
    path('articles/<slug:category>/<slug:slug>/', views.article_theme_or_detail_view, name='article_by_theme'),
    path('articles/<slug:category>/<slug:slug>/', views.article_theme_or_detail_view, name='article_detail')

]

视图.py

def article_theme_or_detail_view(
    request,
    category_slug,
    slug=None
):
    """
    This view could either be for a theme view or detailview,
    depending on the slug.
    """
    try:
        # Check if the slug represents a theme
        theme = ArticleTheme.objects.get(slug=slug)
        article_list = Article.object.filter(theme=theme)
        
        # Add context
        context = {
            'theme': theme,
            'article_list': article_list
        }

        # Render the template with context
        return render(
            request,
            'article_by_theme.html',
            context
        )
    except ArticleTheme.DoesNotExists:
        # The theme does not exist so the slug must be for a detail view
        context = {
            article = Article.objects.get(slug=slug)
        }

        return render(
            request,
            'article_detail.html',
            context
        )

去做：

• 删除其中一条 url 路线