作业33-评论列表显示及排序，个人中心显示

• 显示所有评论 {% for foo in ques.comments %}

{% for foo in ques.comments %}
            <li class="list-group-item">
                <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                <a href="{{ url_for('usercenter',user_id=foo.author_id) }}">{{ foo.author.username }} </a>
                <span class="badge">{{ foo.creat_time }}</span>
                <p>{{ foo.detail }}</p>
            </li>

        {% endfor %}

• 所有评论排序 uquestion = db.relationship('Question', backref=db.backref('comments', order_by=creat_time.desc))

question = db.relationship('Question', backref=db.backref('comments'),order_by=creat_time.desc)

• 显示评论条数 {{ ques.comments|length }}

 <h4>评论：({{ sen.comments|length }})</h4>

• 完成个人中心

1.个人中心的页面布局（html文件及相应的样式文件）

2.定义视图函数def usercenter(user_id):

3.向前端页面传递参数

4.页面显示相应数据

{% extends 'navigation.html' %}
{% block title %}个人中心{% endblock %}
{% block main %}
    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ username }}<br>
            <small>全部问答<span class="badge"></span></small>
        </h3>
        <ul class="list-group" style="margin: 10px">
            {% for foo in question %}
                <li class="list-group-item">
                    <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                    <a href="#">{{ foo.author.username }}</a>
                    <span class="badge">{{ foo.creat_time }}</span>
                    <p>{{ foo.detail }}</p>
                </li>
            {% endfor %}
        </ul>
    </div>

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ user }}<br>
            <small>全部评论<span class="badge"></span></small>
        </h3>
        <ul class="list-group" style="margin: 10px">
            {% for foo in comments %}
                <li class="list-group-item">
                    <span class="glyphicon glyphicon-heart-empty" aria-hidden="true"></span>
                    <a href="#">{{ foo.author.username }}</a>
                    <span class="badge">{{ foo.creat_time }}</span>
                    <p>{{ foo.detail }}</p>
                </li>
            {% endfor %}
        </ul>
    </div>

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ user }}<br>
            <small>个人信息<span class="badge"></span></small>
        </h3>
        <ul style="padding-left: 0px;margin-bottom: 0px;">
            <li class="list-group-item" style=" 900px">用户：{{ username }}</li>
            <li class="list-group-item" style=" 900px">编号：</li>
            <li class="list-group-item" style=" 900px">昵称：</li>
        </ul>
    </div>

{% endblock %}

@app.route('/usercenter/<user_id>')
@loginFirst
def usercenter(user_id):
    user=User.query.filter(User.id==user_id).first()
    context={
        'username':user.username,
        'question':user.question,
        'comments':user.comments
    }
    return render_template('usercenter.html',**context)