从首页问答标题到问答详情页

主PY文件写视图函数，带id参数。 

@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)

　　

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

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

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

   　　

2. 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 }}

3. 建立评论的对象关系映射：

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

   {% for foo in questions %}
       <ul class="new-list">
       <li>
               <a href="#">{{ foo.author.username }}</a><br>
               <a target="_self" href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a>
               <p>
               {{ foo.detail }}
               </p>
           <span class="post_item_foot">
               发布于   {{ foo.create_time }}
           </span>
                </li>
          </ul>
   

   　　

4.  尝试实现发布评论。

   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'))
       create_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'))