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>