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=['GET','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(author_id = auth_id, question_id = ques_id, detail=comment)
       db.session.add(comm)
       db.session.commit()
       return redirect(url_for('detail'))

    

2. 用<input type="hidden" 方法获取前端的"question_id" 
3. 显示评论次数
4. 要求评论前登录

   @loginFirst

    

5. 尝试实现详情页面下的评论列表显

   {% extends 'base.html' %}
   {% block title %}
       问答详情
   {% endblock %}
   {% block main %}
       <div class="box">
           <h3 href="#" >{{ ques.title }}</h3><small> {{ ques.author.username }}<span class="badge" style="margin-left: 75%">{{ ques.create_time }}</span></small>
           <hr>
           <p class="lead">{{ ques.detail }}</p>
           <hr>
           <form action="{{ url_for('comment') }}" method="post" style="">
               <div class="form-group">
                       <input type="text" value="{{ ques.id }}" name="question_id" hidden>
                       <input type="text" value="{{ user.id }}" name="author_id" hidden>
                       <textarea name="detail" class="form-control"  row="3" id="new-comment" placeholder="write your comment"></textarea>
                   </div>
               <button type="submit" >发送</button>
           </form>
   <h4>评论({{ questions.comments|length }})</h4>
   <ul class="list-group"> <li class="list-group-item"> <img style="width: 30px" src="{{ url_for('static',filename='css/pink.jpg') }}" alt="64"> <a href="#"></a><br> <p style="align-content: center"></p> <span class="badge" style="margin-left: 60%"></span> <p style="margin-left: 25%"></p><br> </li> </ul> </div> {% endblock %}