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 %}
   
   
2. 所有评论排序
   uquestion = db.relationship('Question', backref=db.backref('comments', order_by=creat_time.desc))
   
   
3. 显示评论条数
   {{ ques.comments|length }}
   
   
4. 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

发布的全部问答

发布的全部评论

个人信息

5.各个页面链接到个人中心

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'))

@app.route('/usercenter/<user_id>')

def usercenter(user_id):
    user=User.query.filter(User.id == user_id).first()
    context={
       'user':user

    }
    return render_template('usercenter.html',**context)

{% extends'base.html' %}

{% block title %}个人中心{% endblock %}
{% block head %}{% 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="padding-left: 0px; padding-right: 10px; box-shadow: rgba(0, 0, 0, 0.498039) 0px 0px 0px 0px;">
        {% for foo in user.questions %}
            <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>{{ 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" style="padding-left: 0px; padding-right: 10px; box-shadow: rgba(0, 0, 0, 0.498039) 0px 0px 0px 0px;">
        {% for foo in user.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>{{ foo.detail }}</p>

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

    <div class="page-header">
    <h3><span class="glyphicon glyphicon-user" aria-hidden="true"></span>{{ username }}<br><small>个人信息<span class="badge"></span></small></h3>
    <ul class="list-group" style="padding-left: 0px; padding-right: 10px; box-shadow: rgba(0, 0, 0, 0.498039) 0px 0px 0px 0px;">
        <li class="list-group-item">用户：{{ user.username }}</li>
        <li class="list-group-item">编号：{{ user.id }}</li>


    </ul>
    </div>

{% endblock %}