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。

 

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)    creatTime=db.Column(db.DateTime,default=datetime.now)    question=db.relationship('Question',backref=db.backref('comments',order_by=creatTime.desc))    author=db.relationship('User',backref=db.backref('comments'))#db.create_all()@app.route('/')def home():    context={        'question': Question.query.all()    }    return render_template('shouye.html',**context)@app.route('/question_detail/
      
       ')def question_detail(question_id):    question = Question.query.filter(Question.id == question_id).first()    return render_template('question_detail.html',question=question)@app.route('/comment/',methods=['GET','POST'])# @loginFirstdef comment():    if request.method == 'GET':        return render_template('question_detail.html')    else:        detail = request.form.get('detail')        author_id =User.query.filter(User.username == session.get('user')).first().id        #question_id=Question.query.filter(Question.authorID ==author_id).first().id        #question=Question.query.filter(Question.authorID == session.get('question')).first()        #user = User.query.filter(User.username == session.get('user')).first()        comments = Comment(detail=detail,author_id=author_id,question_id=question_id)        #comments.question=question        #comments.author = user        db.session.add(comments)        db.session.commit()        return redirect(url_for('home'))if __name__ == '__main__':    app.run(debug=True)
      

{% extends'base.html' %}{% block title %}    Home{% endblock %}{% block head %}    
      {% endblock %}{% block main %}
      
    
       
    
        
{
    { question.title }}
    
        {
    { question.author.username }}    
        {
    { question.creatTime }}    
        
    
        {
    { question.detail }}    
        
    
        
    
             
         
         发布     
        
    
        
评论：({
    { question.comments|length }})
    
        
                 {% for foo in question.comments %}        
                 
         {
    { foo.author.username }}         
         {
    { foo.creatTime }}           
         
        
         
{
    { foo.detail }}
        {% endfor %}    
        
       
      
{% endblock %}