完成评论功能

1. 定义评论的视图函数
   @app.route('/comment/',methods=['POST'])
   def comment()：
   读取前端页面数据，保存到数据库中

   @app.route('/comment/',methods=['POST'])
   @loginFrist
   def comment():
       comment = request.form.get('new_comment')
       ques_id = request.form.get('question_id')
       auth_id = User.query.filter(User.username == session.get('user')).first().id
       comm = Comment(author_id=auth_id,question_id=ques_id,detail=comment)
       db.session.add(comm)
       db.session.commit()
       return redirect(url_for('detail',question_id=ques_id))

   

2. 用<input type="hidden" 方法获取前端的"question_id" 

   <input name="question_id" type="hidden" value="{{ ques.id }}">

3. 显示评论次数

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

    

4. 要求评论前登录

   @loginFrist

    

5. 尝试实现详情页面下的评论列表显示

    <ul class="note-list" style="padding-left: 0px;">
           {% for foo in 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.time }}</span>
               <br>
               <p>{{ foo.detail }}</p>
   
           </li>
           {% endfor %}
       </ul>