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) }}
   
   
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 }}

4. 建立评论的对象关系映射：

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

5.  尝试实现发布评论。

   1.
   @app.route('/detail/<question_id>')  
   def detail(question_id):
       fa = Question.query.filter(Question.id == question_id).first() 
       return render_template('detail.html', fa=fa)

    23.
     <ul class="list-unstyled">
                   {% for foo in question %}
                   <li class="list-group-item-success">
                       <a href="#">{{ foo.author.username }}</a>
                       <h4 class="text-center"><a href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a>
                       </h4>
                       <span class="badge pull-right">{{ foo.creat_time }}</span>
                       <br>
                       <p>{{ foo.detail }}</p>
                   </li>
                   {% endfor %}
               </ul>

   4.
   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'))
       question_id = db.Column(db.Integer, db.ForeignKey('question.id'))
       detail = db.Column(db.Text, nullable=False)
       crea_time = db.Column(db.DateTime, default=datetime.now)
       author = db.relationship('User', backref=db.backref('comment'))
       question = db.relationship('Question', backref=db.backref('comment'))