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) 

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

   {% extends 'base.html' %}
   {% block title %}
       首页
   {% endblock %}
   {% block head %}
       <link type="text/css" rel="stylesheet" href="{{ url_for('static',filename='css/index.css') }}">
   
   {% endblock %}
   {% block main %}
   
   
          <ul class="list1" >
          <img src="../static/images/myself.jpg" width="60" height="60">
              {% for foo in questions %}
                  <li class="list-group-item">
                     <span class="glyphicon glyphicon-leaf" aria-hidden="true"></span>
                  {% if username %}
                      <li class="zero"><a href="{{ url_for('detail',question_id=foo.id) }}">{{ username }}</a></li>
                  {% endif %}
                  <a class="#"></a>
                      <br>
                  <span class="badge">{{ foo.creat_time }}</span>
                  <li class="one" a href="#">{{ foo.title }}</li>
                  <li class="two"><p style="text-indent: 18px">{{ foo.detail }}</p></li>
                  </li>
              {% endfor %}
          </ul>
   
   {% endblock %}

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 }}

   {% extends 'base.html' %}
   
   {% block title %}问答{% endblock %}
   {% block head %}
       <link type="text/css" rel="stylesheet" href="{{ url_for('static',filename='css/label.css') }}">
       <script src="{{ url_for('static',filename='js/label.js') }}"></script>
   {% endblock %}
   
   {% block main %}
      <div class="label">
       <h1 style="color:pink",align="center"> 发布问答</h1>
           <div class="q">
               <label for="question">问题</label>
               <textarea id="question" cols="50" rows="1"></textarea>
           </div>
           <div class="form-group">
               <label for="questionDetail">内容</label>
               <textarea class="form-control" id="questionDetail" cols="50" rows="5"></textarea>
           </div>
          <br>
           <div class="input-area">
               <button onclick="fnQuestion">发布问答</button>
           </div>
       </div>
   {% endblock %}

    

4. 建立评论的对象关系映射：

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

   class Comment(db.Model):
       __tablename__ = 'comment'
       id = db.Column(db.Integer, primary_key=True, autoincrement=True)
       author_id = db.Column(db.Integer, db.ForeignKey('user.id'))
       sent_id = db.Column(db.Integer, db.ForeignKey('sent.id'))
       creat_time = db.Column(db.DateTime, default=datetime.now)
       detail = db.Column(db.TEXT, nullable=False)
       sent = db.relationship('Sent', backref=db.backref('comment'))
       author = db.relationship('User', backref=db.backref('comment'))

5.  尝试实现发布评论