评论列表显示及排序，个人中心显示

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

<ul class="list-group" style="margin: 10px">
   {% for foo in questions.comments %}
     <li class="list-group-item">
         <span class="glyphicon glyphicon-leaf" aria-hidden="true"></span>
         <a href="#">{{ foo.author.username }}</a>
         <span class="badge">{{ foo.creat_time }}</span>
         <p style="..."> {{ foo.detail }}</p>
    </li>
   {% endfor %}
</ul>

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

class Comment(db.Model):
    __tablename__ = 'comment'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    author_id = db.Column(db.Integer,db.ForeignKey('user.id'))
    question_id = db.Column(db.Integer,db.ForeignKey('question.id'))
    creat_time = db.Column(db.DateTime,default=datetime.now)
    detail = db.Column(db.Text,nullable=False)
    question = db.relationship('Question',backref = db.backref('comments',order_by=creat_time.desc))
    author = db.relationship('User',backref = db.backref('comments'))

3.显示评论条数
  {{ ques.comments|length }}

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

4.完成个人中心

   a.个人中心的页面布局（html文件及相应的样式文件）

   b.定义视图函数def usercenter(user_id):

   c.向前端页面传递参数

   d.页面显示相应数据

       发布的全部问答

       发布的全部评论

       个人信息

   e.各个页面链接到个人中心

{% extends 'base.html' %}
{% block title %}个人中心{% endblock %}

{% block main %}

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-leaf" aria-hidden="true"></span>{{ username }}<br><small>全部问答<span class="badge>"></span></small></h3>
        <ul class="list-group">
            {% for foo in questions %}
                <li class="list-group-item">
                    <span class="glyphicon glyphicon-leaf" aria-hidden="true"></span>
                    <a href="#">{{ foo.author.username }}</a>
                    <span class="badge">{{ foo.creat_time }}</span>

                    <p style="..."> {{ foo.detail }}</p>

                </li>
            {% endfor %}
        </ul>
    </div>

    <div class="page-header">
       <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ username }}<br><small>全部评论<span class="badge"></span></small></h3>
       <ul class="list-group">
           {% 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.create_time }}</span>

                   <p style="..."> {{ 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 class="list-group">
            <li class="list-group-item">用户：{{ username }}</li>
            <li class="list-group-item">编号：{{ id }}</li>
            <li class="list-group-item">昵称：{{ nickname }}</li>
        </ul>
     </div>
{% endblock %}