12.8

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'])
   @loginFirst
   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(auth_id=auth_id,qusetion_id=ques_id,detail=comment)
       db.session.add(comm)
       db.session.commit()
       return redirect(url_for("xiangqing"))

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

   <form action="{{ url_for('comment') }}" method="post" style="">
               <div class="form-group">
               <textarea name="new_comment" class="form-control" rows="5" id="new-comment"
                         placeholder="Write your comment~" style=" 850px"></textarea><br>
                   <input type="hidden" name="question_id" value="{{ ques.id }}">
               </div>
               <button type="submit" class="btn btn-default" style="100px "> 发送
               </button>
           </form>

3. 显示评论次数<h4>评论:({{ ques.comments|length }})</h4>

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

4. 要求评论前登录

   @app.route('/comment/',methods=['POST'])
   @loginFirst
   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(auth_id=auth_id,qusetion_id=ques_id,detail=comment)
       db.session.add(comm)
       db.session.commit()
       return redirect(url_for("xiangqing"))