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. @app.route('/detail/<question_id>')
   def detail(question_id):
       quest =Question.query.filter(Question.id==question_id).first()
      
       return render_template('detail.html') 

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

3. index.  
   
    {% for foo in questions %}
   
               <li class="list-group-item" style="width: 600px">
                   <a class="wrap-img" href="#" target="_blank">
                       <img src="{{ foo.author.image }}" width="35px">
                   </a>
                   <span class="glyphicon glyphicon-left" aria-hidden="true"></span>
                   <a href="#" target="_blank">{{ foo.author.username }}</a>
                   <br>
                   <a href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a>
   
                   <br>
                   <span class="badge">发布时间:{{ foo.creat_time }}</span>
                   <p style="">{{ foo.detail }}
                   </p>
   
               </li>
           {% endfor %}

    

4. 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 }}

5. {% extends 'base.html' %}
   {%  block title %}问答详情{% endblock %}
   
   {% block main %}

   <div class="list-group ">
       <div class="page-headr">
   
           <h3>{{ ques.title }}<br>
               <small>{{ ques.author.username }}<span class="badge">{{ ques.creat_time }}</span></small>
           </h3>
           <hr>
           <p>detail:{{ ques.detail }}</p>
           <hr>
   
           <form action="{{ url_for('comment') }}"method="post"style="">
               <div class="form-group">
                   <input type="text" value="{{ ques.id }}" name="question_id" hidden>
                   <input type="text" value="{{ user.id }}" name="author_id" hidden>
                   <textarea name="detail" class="form-control"  row="3" id="new-comment" placeholder="write your comment"></textarea>
               </div>
           </form>评论：<h4>({{ ques.comment|length }}</h4>
   
   
   
               <button type="submit" class="btn btn-default" style="width:85px "> 发送
               </button>
       </div>
           <ul class="list-group" style="margin: 10px;list-style: none"></ul>
           {% for foo in ques.comments %}
              <li class="list-group">
                  <span class="glyphicon glyphicon-heart-empty"aria-hidden="true"></span>
                  <a href="#">{{ foo.author.username }}</a>
                  <span class="badge">{{ foo.creat_time }}</span>
                  <p style="width:60px">{{ foo.detail }}</p>
              </li>
       </div>
   </div>

    {% endblock %}

    

6. 建立评论的对象关系映射：

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

7. py
   
   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'))

    

8.  尝试实现发布评论。