【3.5】实现上下篇文章跳转

1.添加上下篇文章的按钮

<div>
        <nav aria-label="...">
            <ul class="pager">
                <li><a href="/blog/detail/{{ previous_article.article_id }}">上一篇：{{ previous_article.title }}</a></li>
                <li><a href="/blog/detail/{{ next_article.article_id }}">下一篇：{{ next_article.title }}</a></li>
            </ul>
        </nav>
    </div>

2.修改视图函数

def get_detail_page(requset, article_id):
    all_article = Article.objects.all()
    curr_article = None
    previous_index = 0
    next_index = 0
    previous_article = None
    next_article = None
    for index, article in enumerate(all_article):
        # 当文章是第一篇的时候
        if index == 0:
            previous_index = 0
            next_index = index + 1
        # 当文章是最后一篇的时候
        elif index == len(all_article) - 1:
            previous_index = index - 1
            next_index = index
        else:
            previous_index = index - 1
            next_index = index + 1
        if article.article_id == article_id:
            curr_article = article
            previous_article = all_article[previous_index]
            next_article = all_article[next_index]
            break
    section_list = curr_article.content.split('
')
    return render(requset, 'blog/detail.html',
                  {
                      'curr_article': curr_article,
                      'section_list': section_list,
                      'previous_article': previous_article,
                      'next_article': next_article
                  })