Django model类

from mysite.blog.models import BlogPostnode2:/app/mysite/blog#cat models.pyfrom django.db import modelsfrom django.contrib import admin# Create your models here.class BlogPost(models.Model):    title = models.CharField(max_length = 150)    body = models.TextField()    timestamp = models.DateTimeField()    class Meta:      ordering =('-timestamp',)class BlogPostAdmin(admin.ModelAdmin):    list_display = ('title','timestamp')admin.site.register(BlogPost,BlogPostAdmin)BlogPost 继承了class BlogPost(models.Model)类,我们就获得了Django对象关系映射的全部里拉。node2:/usr/local/lib/python2.7/site-packages/django#lsapps  contrib  dispatch  __init__.py   __main__.pyc  shortcuts.pyc  test   viewsbin   core     forms     __init__.pyc  middleware    template       urlsconf  db       http      __main__.py   shortcuts.py  templatetags   utilsnode2:/usr/local/lib/python2.7/site-packages/django#node2:/app/mysite/blog#cat view.py # -*- coding: utf-8 -*-from __future__ import unicode_literals# from django.shortcuts import render, render_to_responsefrom .models import *# Create your views here.from django.http import HttpResponsefrom django.template import loaderdef index(req):# get all blogpost objects  blog_list = BlogPost.objects.all()  print blog_list  template = loader.get_template('index.html')  context = {  'blog_list':blog_list  }  return HttpResponse(template.render(context, req))node2:/app/mysite/blog#def index(req): 第5行每个Django视图函数都将django.http.HttpRequest对象作为它的第一个参数。  blog_list = BlogPost.objects.all() 当我们把BlogPost类作为django.model.Model的一个子类时,我们就获得了Django对象关系映射的全部里拉。 template = loader.get_template('index.html')这里我们只需告诉Django模板的名字就能创建模板对象template 因为我们把它保存在app下的templates目录里,Django无需更多指示就能找到它。node2:/app/mysite/blog/templates#cat index.html {% extends "base.html" %}  {% block content %}      {% for post in blog_list %}      <h2>{{  post.title }}</h2>      <p>{{ post.timestamp | date:"1,F jS"}}</p>      <p>{{ post.body }}</p>      {% endfor %}  {% endblock %}