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

2. @app.route('/comment/',methods=['POST'])
   def comment():
        comment =request.form.get('new_comment')
        ques_id =request.form.get('question_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'))

    

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

4. {% extends 'base.html' %}
   {%  block title %}问答详情{% endblock %}
   
   {% block main %}
   <div class="list-group ">
       <div class="page-headr">
   
           <h3>{{ ques.title }}<br><small>{{ ques.author.username }}<span class="badge">{{ ques.creat_time }}</span></small>
           </h3>
       </div>
           <p class="lead">{{ ques.detail }}</p>
           <hr>
   
           <form action="{{ url_for('comment') }}"method="post"style="">
               <div class="form-group">
                   <textarea name="new_comment" class="form_control" rows="3" id="new_comment" placeholder="write your comment"></textarea>
                   <input name="question_id" type="hidden" value="{{ques.id}}"/>
               </div>
   
                <button type="submit" class="btn btn-default" style="width:85px "> 发送</button>
   
                </form>
                 <h4>评论({{ ques.comments|length }}</h4>
   
   
   
           <ul class="list-group" style="margin: 10px;list-style: none"></ul>
       {% endblock %} 

    

5. 显示评论次数

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

    

6. 要求评论前登录

   @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))

    

7. 尝试实现详情页面下的评论列表显示

8.   {% for com in ques.comment %}
   
       <a href="#" >{{ com.author.username }}</a>
       <small>{{ com.creat_time }}</small>
       <p class="">{{ com.detail }}</p>
       {% endfor %}