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)

@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)

2.首页标题的标签作带参数的连接。
      {{ url_for('detail',question_id = foo.id) }}

{% block main%}
<p>{{user}} context</p>
<ul class="list-group">
{% for foo in questions %}
    <li class="list-group-item">
        <span class="glyphicon glyphicon-leaf" aria-hidden="true"></span>
        <a href="#">{{ foo.author.username }}</a>
        <br>
        <a href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a>
        <span class="badge">{{ foo.creat_time }}</span>
        <p style="color:black">{{ foo.detail }}</p>
    </li>
{% endfor %}
</ul>
{% endblock %}

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 }}

{% extends 'base.html' %}
{% block title %}问答详情{% endblock %}
{% block main %}
<div class="page-header">
<h3>题目：{{ ques.title }}<br><small>做者：{{ ques.author }} 发布时间：{{ ques.create_time }}</small></h3>
</div>
<p class="lead">detail{{ ques.detail }}</p>
<hr>
<form action="{{ url_for('question') }}" method="post">
<div class="form-group">
<textarea name="new_comment" class="form-control" rows="3" id="new_comment" placeholder="write your comment"></textarea>
</div>
<button type="submit" class="btn btn-default">发送</button>
</form>
<ul class="list-group" style="margin: 10px"></ul>

{% endblock %}

4.创建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'))
    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'))