从首页问答标题到问答详情页

@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)

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.author.username}}</a>
        <br>
        <a href="#">{{ foo.title }}</a><br>
        <span class="badge">{{ foo.creat_time }}</span><br>
        <p style="color:black">{{ foo.detail}}</p><br>

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 }}
建立评论的对象关系映射：

class Comment(db.Model):
__tablename__='comment'
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('comment'))
    author = db.relationship('User', backref=db.backref('comment'))

{% extends'fumoban.html' %}
{% block title %}评论详情{% endblock %}

    <meta charset="UTF-8">
{% block head %}
    <link  href="../static/css/detail.css" rel="stylesheet" type="text/css">
    {% endblock %}
{% block main %}
<body id="body">

<div class="essayAera">
<ul class="list-group">
                           <a  class="author" href="">{{ ques.author.username }}</a>
                           <br>
                       <a class="title"  href="">{{ ques.title }}</a>
                               <br>
                               <span >{{ ques.create_time }}</span>
                       <p class="abstract">{{ ques.detail }}</p>

                       <form action="">
                       <div class="form-group">
                       <textarea class="inputFramework"style="margin-top:80px " rows="6" cols="50" id="details" name="detail"></textarea>

                       </div>
                           <button type="submit" class="btn btn-default">发送</button>
                               </form>

                       </ul>


</div>
</body>
{% endblock %}