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=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。

    <ul class="list-group" style="...">
          {% 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="...">{{ foo.detail }}</p>
   
              </li>
   
          {% endfor %}
      </ul>

    

3. 在详情页将数据的显示在恰当的位置。

   {% extends '1101.html' %}
   {% block title %}问答详情{% endblock %}
   {% block main %}
       <div class="page-header">
           <h3>{{ques.id}}{{ques.title}}<br>
               <small>{{ ques.create_time }}{{ ques.author.username}}</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. 建立评论的对象关系映射。

   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'))

    

5.  尝试实现发布评论。