使用redis實現【統計文章閱讀量】及【最熱文章】功能

1、視圖函數

# 不需要登錄裝飾器，匿名用戶也可訪問
def article_detail(request, id, slug):
    # print(slug,id)
    article = get_object_or_404(ArticlePost, id=id, slug=slug)
    # 連接redis
    r = redis.StrictRedis(host=settings.REDIS_HOST, port=settings.REDIS_PORT, db=settings.REDIS_DB)
    # 總的訪問次數，訪問一次就+1，一般命名規則為"對象類型：對象ID：對象屬性"
    total_views = r.incr('article:{}:views'.format(article.id))
    # zincrby(name, amount, value)方法:根據amount設定的步長增加有序集合name中的value的分值（類似於權重）
    # 實現了每訪問一次文章就會將article_ranking中的article.id分值增加1
    # article_ranking中存放的是文章的id用來代表文章，每訪問一次該文章就會增加文章的分值
    r.zincrby('article_ranking', 1, article.id)
    # 獲取分值排名前十的對象
    article_ranking = r.zrange('article_ranking', 0, -1, desc=True)[:10]
    # 獲取排名前十文章的id列表,使用的是列表推導式，先進行for循環，再將每次的的值帶入int()方法運算，將結果放在新的列表中
    article_ranking_ids = [int(id) for id in article_ranking]
    print('文章瀏覽量對應的id：%s' % article_ranking_ids)
    # 查詢出排名在前十的文章對象,並放在list中。注意id__in用法：id在article_ranking_ids列表中
    most_viewed = list(ArticlePost.objects.filter(id__in=article_ranking_ids))
    print('文章未排序：%s' % most_viewed)
    # 將獲得的列表按照下表索引進行排序，lamda為匿名函數，先運算后面表達式，冒號前的x相當於參數，代表most_viewed列表中文章對象
    # 按照文章的id得到對應的下標,再按照下標進行排序
    most_viewed.sort(key=lambda x: article_ranking_ids.index(x.id))
    print('文章已經排序：%s' % most_viewed)
    return render(request, 'article/column/article_detail.html', {'article': article,
                                                                  'total_views': total_views,
                                                                  'most_viewed': most_viewed})

　　2、前端頁面

{% extends 'article/base.html' %}
{% load staticfiles %}
{% block title %}article detail{% endblock %}

{% block content %}
<div class="container">
    <div class="col-md-9">
        <header>
            <h1>{{ article.title }}</h1>
            <p>{{ user.username }} {{ total_views }}次閱讀</p>
        </header>

        <link rel="stylesheet" href="{% static 'editor/css/editormd.preview.css' %}">

        <div id="editormd-view">
            <textarea id="append-test" style="display: none">
    {{ article.body }}
            </textarea>
        </div>
    </div>
    <div class="col-md-3">
        <p class="text-center">最受歡迎文章</p>
        <ol>
            {% for article_rank in most_viewed %}
            <li>
                <a href="{{ article_rank.get_url_path }}">{{ article_rank.title }}</a>
            </li>
            {% endfor %}
        </ol>
    </div>

</div>
    <script src="{% static 'js/jquery.js' %}"></script>
    <script src="{% static 'editor/lib/marked.min.js' %}"></script>
    <script src="{% static 'editor/lib/prettify.min.js' %}"></script>
    <script src="{% static 'editor/lib/raphael.min.js' %}"></script>
    <script src="{% static 'editor/lib/underscore.min.js' %}"></script>
    <script src="{% static 'editor/lib/sequence-diagram.min.js' %}"></script>
    <script src="{% static 'editor/lib/flowchart.min.js' %}"></script>
    <script src="{% static 'editor/lib/jquery.flowchart.min.js' %}"></script>
    <script src="{% static 'editor/editormd.js' %}"></script>

    <script type="text/javascript">
            $(function () {
                editormd.markdownToHTML("editormd-view",{
                    htmlDecode:"style,script,iframe",
                    emoji:true,
                    tasklist:true,
                    flowChart:true,
                    tex:true,
                    sequenceDiagram:true,
                });
            });
    </script>
{% endblock %}