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。

{% extends 'index.html' %}
{% block title %}首页{% endblock %}
{% block head %}
    <link rel="stylesheet" type="text/css" href="../static/css/index.css">
{% endblock %}
{% block main %}
    <div class="question-box">
        <P style="font-size: 18px">{{ user }}prefect</P>
        <ul class="list-group" style=" padding-left: 10px;padding-right: 10px;">
            {% for foo in questions %}
                <li class="list-group-item">
                    <span class="glyphicon glyhicon-leaf" aria-hidden="true"></span>
                    <a href="#">{{ foo.username }}</a><br>
                    <a href="{{ url_for('xiangqing',question_id=foo.id )}}">问题：{{ foo.title }}</a><br>
                    <p>详情：{{ foo.detail }}</p>
                        <span class="badge">时间：{{ foo.creat_time }}</span><br>
                </li>
            {% endfor %}
        </ul>
    </div>
{% endblock %}

{% extends 'base.html' %}
{% block title %}问答详情{% endblock %}
{% block main %}
    <div class="col-md-2 column "></div>
    <div class="col-md-8 column ">
        <div class="page-headr">
            <h1>welcome!</h1><br>
            <h3>Title{{ ques.title }}<br>
                <small>author:{{ ques.author.username }}<span class="badge">time:{{ ques.creat_time }}</span></small>
            </h3>
            <hr>
            <p>detail:{{ ques.detail }}</p>
            <hr>
            <form>
                <div class="form-group">
            <textarea name="new_comment" class="form-control" rows="5" id="new-comment"
                      placeholder="请写下您的观点" style="width: 850px"></textarea><br>
                </div>
                <button type="submit" class="btn btn-default" style="width:100px "> 发送
                </button>
            </form>
{#                            <h4>comment:({{ ques.comments|length }})</h4>#}
            <ul class="list-group" style="margin: 10px"></ul>
        </div>
    </div>
    <div class="col-md-2 column "></div>
{% endblock %}

@app.route('/question/', methods=['GET', 'POST'])
@loginFirst
def question():
    if request.method == 'GET':
        return render_template('question.html')
    else:
        title = request.form.get('title')
        detail = request.form.get('detail')
        author_id = User.query.filter(User.username == session.get('user')).first().id
        question = Question(title=title, detail=detail, author_id=author_id)
        db.session.add(question)  # 数据库，添加操作
        db.session.commit()
        return redirect(url_for('myweb'))


@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)

 

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'))