一百四十六：CMS系统之帖子按照发布时间和评论数量排序

按照不同选项进行排序

视图

@bp.route('/')
def index():
    board_id = request.args.get('board_id', type=int, default=None)
    banners = BannerModel.query.order_by(BannerModel.priority.desc()).limit(4)  # 只取4条
    boards = BoardModel.query.all()
    sort = request.args.get('sort', type=int, default=1)  # 排序方式：精华帖子、点赞最多、评论最多
    page = request.args.get(get_page_parameter(), type=int, default=1)
    start = (page - 1) * config.PER_PAGE
    end = start + config.PER_PAGE
    if sort == 1:  # 默认时间倒序
        query_obj = PostModel.query.order_by(PostModel.create_time.desc())
    elif sort == 2:  # 加精时间倒序
        query_obj = db.session.query(PostModel).outerjoin(HighlightPostModel).order_by(
            HighlightPostModel.create_time.desc(),  PostModel.create_time.desc())
    elif sort == 3:  # todo 点赞数量倒序
        query_obj = PostModel.query.order_by(PostModel.create_time.desc())
    elif sort == 4:  # 评论数量倒序
        query_obj = db.session.query(PostModel).outerjoin(CommentModel).group_by(
            PostModel.id).order_by(func.count(CommentModel.id).desc(), PostModel.create_time.desc())
    if board_id:
        query_obj = query_obj.filter_by(board_id=board_id)
        posts = query_obj.slice(start, end)
        total = query_obj.count()
    else:
        posts = query_obj.slice(start, end)
        total = PostModel.query.count()
    # bs_version: bootstrap版本
    pagination = Pagination(bs_version=3, page=page, total=total)
    context = {'banners': banners, 'boards': boards, 'posts': posts, 'pagination': pagination,
               'current_board': board_id,  # 把board_id传给前端用于渲染选中事件
               'current_sort': sort}  # 把sort传给前端用于渲染选中事件
    return render_template('front/front_index.html', **context)

前端

{% extends 'front/front_base.html' %}
{% from "common/_macros.html" import static %}

{% block title %}
    首页
{% endblock %}

{% block head %}
    <link rel="stylesheet" href="{{ static('front/css/front_index.css') }}">
{% endblock %}

{% block body %}
    <div class="lg-container">

        <!-- 轮播图 -->
        <div id="carousel-example-generic" class="carousel slide index-banner" data-ride="carousel">
          <!-- 指示器，轮播图下方的圆圈，需与轮播图数量一致 -->
          <ol class="carousel-indicators">
            <li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
            <li data-target="#carousel-example-generic" data-slide-to="1"></li>
            <li data-target="#carousel-example-generic" data-slide-to="2"></li>
            <li data-target="#carousel-example-generic" data-slide-to="3"></li>
          </ol>
          <!-- 轮播图 这里的图片是在百度复制的轮播图链接-->
          <div class="carousel-inner" role="listbox">
              {% for banner in banners %}
                {% if loop.first %}
                    <div class="item active">
                {% else %}
                    <div class="item">
                {% endif %}
                <a href="{{ banner.link_url }}"><img src="{{ banner.image_url }}" alt="{{ banner.name }}"></a>
                </div>
              {% endfor %}
          </div>
          <!-- 左右切换的控制按钮 -->
          <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
            <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
          </a>
          <a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
            <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
          </a>
        </div>
        <div class="post-group">
            <ul class="post-group-head">
                {#默认排序按发布时间，2：精华帖子、3：点赞最多、4：评论最多#}
                {% if current_sort == 1 %}
                    <li class="active"><a href="/">最新</a></li>
                {% else %}
                    <li><a href="/">最新</a></li>
                {% endif %}
                {% if current_sort == 2 %}
                    <li class="active"><a href="{{ url_for('front.index', sort=2) }}">精华帖子</a></li>
                {% else %}
                    <li><a href="{{ url_for('front.index', sort=2) }}">精华帖子</a></li>
                {% endif %}
                {% if current_sort == 3 %}
                    <li class="active"><a href="{{ url_for('front.index', sort=3) }}">点赞最多</a></li>
                {% else %}
                    <li><a href="{{ url_for('front.index', sort=3) }}">点赞最多</a></li>
                {% endif %}
                {% if current_sort == 4 %}
                    <li class="active"><a href="{{ url_for('front.index', sort=4) }}">评论最多</a></li>
                {% else %}
                    <li><a href="{{ url_for('front.index', sort=4) }}">评论最多</a></li>
                {% endif %}
            </ul>
            <ul class="post-list-group">
                {% for post in posts %}
                    <li>
                        <div class="author-avatar-group">
                            <img src="{{ post.author.avatar or static('common/images/logo.png') }}" alt="">
                        </div>
                        <div class="posst-info-group">
                            <a href="{{ url_for('front.post_detail', post_id=post.id) }}" class="post-title">{{ post.title }}</a>
                            {% if post.highlight %}
                                <span class="label label-danger">精华帖</span>
                            {% endif %}
                            <p class="post-info">
                                <span>作者： {{ post.author.username }}</span>
                                <span>发表时间： {{ post.create_time }}</span>
                                <span>评论： 0</span>
                                <span>阅读： 0</span>
                            </p>
                        </div>
                    </li>
                {% endfor %}
            </ul>
            <div class="text-center">
                {{ pagination.links }}
            </div>
        </div>
    </div>
    <div class="sm-container">
        <div style="padding-bottom: 10px;">
            <a href="{{ url_for('front.apost') }}" class="btn btn-warning btn-block">发布帖子</a>
        </div>
        <div class="list-group">
        {% if current_board %}
            <a href="/" class="list-group-item">所有板块</a>
        {% else %}
            <a href="/" class="list-group-item active">所有板块</a>
        {% endif %}
        {% for board in boards %}
            {% if board.id == current_board %}
                <a href="{{ url_for('front.index', board_id=board.id) }}" class="list-group-item active">{{ board.name }}</a>
            {% else %}
                <a href="{{ url_for('front.index', board_id=board.id) }}" class="list-group-item">{{ board.name }}</a>
            {% endif %}
        {% endfor %}
        </div>
    </div>
{% endblock %}

效果

根据板块+选项排序

{% extends 'front/front_base.html' %}
{% from "common/_macros.html" import static %}

{% block title %}
    首页
{% endblock %}

{% block head %}
    <link rel="stylesheet" href="{{ static('front/css/front_index.css') }}">
{% endblock %}

{% block body %}
    <div class="lg-container">

        <!-- 轮播图 -->
        <div id="carousel-example-generic" class="carousel slide index-banner" data-ride="carousel">
          <!-- 指示器，轮播图下方的圆圈，需与轮播图数量一致 -->
          <ol class="carousel-indicators">
            <li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
            <li data-target="#carousel-example-generic" data-slide-to="1"></li>
            <li data-target="#carousel-example-generic" data-slide-to="2"></li>
            <li data-target="#carousel-example-generic" data-slide-to="3"></li>
          </ol>
          <!-- 轮播图 这里的图片是在百度复制的轮播图链接-->
          <div class="carousel-inner" role="listbox">
              {% for banner in banners %}
                {% if loop.first %}
                    <div class="item active">
                {% else %}
                    <div class="item">
                {% endif %}
                <a href="{{ banner.link_url }}"><img src="{{ banner.image_url }}" alt="{{ banner.name }}"></a>
                </div>
              {% endfor %}
          </div>
          <!-- 左右切换的控制按钮 -->
          <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
            <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
          </a>
          <a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
            <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
          </a>
        </div>
        <div class="post-group">
            <ul class="post-group-head">
                {#默认排序按发布时间，2：精华帖子、3：点赞最多、4：评论最多#}
                {% if current_sort == 1 %}
                    <li class="active"><a href="{{ url_for('front.index', sort=1,board_id=current_board) }}">最新</a></li>
                {% else %}
                    <li><a href="{{ url_for('front.index', sort=1,board_id=current_board) }}">最新</a></li>
                {% endif %}
                {% if current_sort == 2 %}
                    <li class="active"><a href="{{ url_for('front.index', sort=2,board_id=current_board) }}">精华帖子</a></li>
                {% else %}
                    <li><a href="{{ url_for('front.index', sort=2,board_id=current_board) }}">精华帖子</a></li>
                {% endif %}
                {% if current_sort == 3 %}
                    <li class="active"><a href="{{ url_for('front.index', sort=3,board_id=current_board) }}">点赞最多</a></li>
                {% else %}
                    <li><a href="{{ url_for('front.index', sort=3,board_id=current_board) }}">点赞最多</a></li>
                {% endif %}
                {% if current_sort == 4 %}
                    <li class="active"><a href="{{ url_for('front.index', sort=4,board_id=current_board) }}">评论最多</a></li>
                {% else %}
                    <li><a href="{{ url_for('front.index', sort=4,board_id=current_board) }}">评论最多</a></li>
                {% endif %}
            </ul>
            <ul class="post-list-group">
                {% for post in posts %}
                    <li>
                        <div class="author-avatar-group">
                            <img src="{{ post.author.avatar or static('common/images/logo.png') }}" alt="">
                        </div>
                        <div class="posst-info-group">
                            <a href="{{ url_for('front.post_detail', post_id=post.id) }}" class="post-title">{{ post.title }}</a>
                            {% if post.highlight %}
                                <span class="label label-danger">精华帖</span>
                            {% endif %}
                            <p class="post-info">
                                <span>作者： {{ post.author.username }}</span>
                                <span>发表时间： {{ post.create_time }}</span>
                                <span>评论： 0</span>
                                <span>阅读： 0</span>
                            </p>
                        </div>
                    </li>
                {% endfor %}
            </ul>
            <div class="text-center">
                {{ pagination.links }}
            </div>
        </div>
    </div>
    <div class="sm-container">
        <div style="padding-bottom: 10px;">
            <a href="{{ url_for('front.apost') }}" class="btn btn-warning btn-block">发布帖子</a>
        </div>
        <div class="list-group">
        {% if current_board %}
            <a href="/" class="list-group-item">所有板块</a>
        {% else %}
            <a href="/" class="list-group-item active">所有板块</a>
        {% endif %}
        {% for board in boards %}
            {% if board.id == current_board %}
                <a href="{{ url_for('front.index', board_id=board.id) }}" class="list-group-item active">{{ board.name }}</a>
            {% else %}
                <a href="{{ url_for('front.index', board_id=board.id) }}" class="list-group-item">{{ board.name }}</a>
            {% endif %}
        {% endfor %}
        </div>
    </div>
{% endblock %}

效果