【3.5】实现上下篇文章跳转

1 <div>
2         <nav aria-label="...">
3             <ul class="pager">
4                 <li><a href="/blog/detail/{{ previous_article.article_id }}">上一篇：{{ previous_article.title }}</a></li>
5                 <li><a href="/blog/detail/{{ next_article.article_id }}">下一篇：{{ next_article.title }}</a></li>
6             </ul>
7         </nav>
8     </div>

 1 def get_detail_page(requset, article_id):
 2     all_article = Article.objects.all()
 3     curr_article = None
 4     previous_index = 0
 5     next_index = 0
 6     previous_article = None
 7     next_article = None
 8     for index, article in enumerate(all_article):
 9         # 当文章是第一篇的时候
10         if index == 0:
11             previous_index = 0
12             next_index = index + 1
13         # 当文章是最后一篇的时候
14         elif index == len(all_article) - 1:
15             previous_index = index - 1
16             next_index = index
17         else:
18             previous_index = index - 1
19             next_index = index + 1
20         if article.article_id == article_id:
21             curr_article = article
22             previous_article = all_article[previous_index]
23             next_article = all_article[next_index]
24             break
25     section_list = curr_article.content.split('\n')
26     return render(requset, 'blog/detail.html',
27                   {
28                       'curr_article': curr_article,
29                       'section_list': section_list,
30                       'previous_article': previous_article,
31                       'next_article': next_article
32                   })