从首页问答标题到问答详情页

1. 主PY文件写视图函数，带id参数。 

   @app.route('/detail/<question_id>')
   def detail(question_id):
       quest = 
       return render_template('detail.html', ques = quest) 

   @app.route('/xiangqing/<question_id>')
   def xiangqing(question_id):
           quest = Question.query.filter(Question.id == question_id).first()
           return render_template('xiangqing.html',ques=quest)

2. 首页标题的标签做带参数的链接。
         {{ url_for('detail',question_id = foo.id) }}
   

    {% for foo in questions %}
                 <ul class="zongl"　>
                 <li>{{ foo.author.username }}</li>
                     <a href="{{ url_for("xiangqing",question_id=foo.id) }}">标题：{{ foo.title }}</a>
                     <li>详情：{{ foo.detail }}</li>
                     <li>发布时间：{{ foo.creat_time }}</li>
                     <br>
                 </ul>
             {% endfor %}

3. 在详情页将数据的显示在恰当的位置。 

   {{ ques.title}}
   {{ ques.id  }}{{  ques.creat_time }}

   {{ ques.author.username }} 
   {{ ques.detail }}

    <div class="d1">
   {#        <form action="{{ url_for('xiangqing') }}" method="post">#}
               <h2>{{ ques.title }}</h2>
               <h3>标题：{{ ques.author.username }}</h3>
               <h3>详情：{{ ques.detail }}</h3>
               <hr>
               <h2>{{ ques.title }}</h2>
               <hr>
               <textarea name='pinglun'></textarea>
               <br> <input  type="submit" value="发布"style="width:65px;height:25px;font-size:15px">
               <p>评论：(#)</p>
   
               <table border=2 >
                   <tr><td>评论详情</td></tr>
                   <tr><td>评论详情</td> </tr>
                   <tr><td>评论详情</td></tr>
                   </tr>
               </table>
   </div>

    

4. 建立评论的对象关系映射：

   class Comment(db.Model):
       __tablename__='comment'

   class Comment(db.Model):
       __tablename__ = 'commment'
       id = db.Column(db.Integer, primary_key=True, autoincrement=True)
       author_id = db.Column(db.Integer, db.ForeignKey('User.id'))
       question_id=db.Column(db.Integer,db.ForeignKey('question.id'))
       detail=db.Column(db.Text,nullable=False)
       creat_time = db.Column(db.DateTime, default=datetime.now)
       question=db.relationship('Question',backref=db.backref('comments'))
       author=db.relationship('User',backref=db.backref('comments'))

   

    

5.  尝试实现发布评论。