三十一、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.首页标题的标签做带参数的链接。
      {{ url_for('detail',question_id = foo.id) }}

<a href="{{ url_for('detail',question_id = foo.id) }}">{{ foo.title }}</a>

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 }}

{% for foo in questions %}
    <ul class="new-list">
    <li>
            <a href="#">{{ foo.author.username }}</a><br>
            <a target="_self" href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a>
            <p>
            {{ foo.detail }}
            </p>
        <span class="post_item_foot">
            发布于   {{ foo.create_time }}
        </span>
             </li>
       </ul>

4.建立评论的对象关系映射：

class Comment(db.Model):
    __tablename__='comment'

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('comments'))
    author = db.relationship('User',backref = db.backref('comments'))

5.尝试实现发布评论。