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('/detail<question_id>')
   def detail(question_id):
       quest = Question.query.filter(Question.id == question_id).first()
       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) }}
   

   <a href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a>

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 }}

<h3>{{ ques.title }}</h3>
    <small>{{ ques.author.username }} <span class="badge">{{ ques.time }}</span></small>
    <hr>

<form class="demo-form">
    <text>{{ ques.detail }}</text><br><br><hr>
     <textarea class="form-control" id="question" placeholder="请输入"></textarea><br><br>
<input type="submit" value="提交" style="float: right">

1. 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'))
       question_id = db.Column(db.Integer, db.ForeignKey('question.id'))
       time = db.Column(db.DateTime, default=datetime.now())
       detail = db.Column(db.Text, nullable=False)
       question = db.relationship('Question', backref=db.backref('comments'))
       author = db.relationship('User', backref=db.backref('comments'))

2.  尝试实现发布评论。 

                      不成功