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。

主py文件：

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'))
    creat_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'))


@app.route('/xq/<question_id>')
def xq(question_id):
    quest = Question.query.filter(Question.id == question_id).first()

    context = {
        'comments': Comment.query.all()
    }
    return render_template('xq.html',**context,ques = quest)

详细页html:

{% extends 'dh.html' %}
{% block title %}
    反馈详情
{% endblock  %}
{% block head %}
        <link rel="stylesheet" type="text/css" href="{{ url_for('static',filename='../static/css/xq.css') }}">
{% endblock  %}
{% block main %}
   <div class="page-header">
   <h3>问题:{{ ques.title }}<br>
       <small>作者:{{ ques.author.username }}<br>
           <span class="">
               发布时间：{{ ques.creat_time }}
           </span></small></h3>
    <p class="lead">详情:{{ ques.detail }} </p>
       <form>
    <div class="form-group">
        <textarea class="form-control" rows="6" id="questionTitle" placeholder="请写下你的评论"
                      style="height: 100px" ></textarea>
    </div>
   <div class="submit-button">
       <br>
       <button type="submit" style="float:right" id="submit-button">发送</button>
    </div></form></div>
    <div class="pl-box">
       <h4>评论区：
       ({{ ques.comments|length }})</h4><br>
        <ul class="list-group">
            {% for ques in questions %}
            <li class="list-group-item">
            <img style=" 30px" src="{{ url_for('static',filename='../static/image/tx.jpg') }}" alt="64">
                <span class="glyphicon glyphicon-left" aria-hidden="true"></span>
                <a href="#">{{ ques.author.username }}</a><br>
                <p style="margin-left: 25%">评论：{{ ques.detail }}</p><br>
                <span class="badge" style="margin-left: 60%">{{ ques.creat_time }}评论时间</span>
            </li>
            {% endfor %}
        </ul>
    </div>


{% endblock %}