text: from django.contrib.auth.models import User
  from django.db import models
  from django.template.loader import render_to_string
  
  
  # Create your models here.
  class Link(models.Model):
      STATUS_NORMAL = 1
      STATUS_DELETE = 0
      STATUS_ITEMS = (
          (STATUS_NORMAL, '正常'),
          (STATUS_DELETE, '删除'),
      )
  
      title = models.CharField(max_length=50, verbose_name='标题')
      href = models.URLField(verbose_name='链接')  # 默认长度为200
      status = models.PositiveIntegerField(default=STATUS_NORMAL, choices=STATUS_ITEMS,
                                           verbose_name='状态')
      weight = models.PositiveIntegerField(default=1, choices=zip(range(1, 6), range(1, 6)),
                                           verbose_name='权重', help_text='权重高展示顺序靠前')
      owner = models.ForeignKey(User, verbose_name='作者')
      created_time = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
  
      class Meta:
          verbose_name = verbose_name_plural = '友链'
  
  
  class SideBar(models.Model):
      STATUS_SHOW = 1
      STATUS_HIDE = 0
      STATUS_ITEMS = (
          (STATUS_SHOW, '展示'),
          (STATUS_HIDE, '隐藏'),
      )
      DISPLAY_HTML = 1
      DISPLAY_LATEST = 2
      DISPLAY_HOT = 3
      DISPLAY_COMMENT = 4
      SIDE_TYPE = (
          (DISPLAY_HTML, 'HTML'),
          (DISPLAY_LATEST, '最新文章'),
          (DISPLAY_HOT, '最热文章'),
          (DISPLAY_COMMENT, '最近评论'),
      )
      title = models.CharField(max_length=50, verbose_name='标题')
      display_type = models.PositiveIntegerField(default=1, choices=SIDE_TYPE,
                                                 verbose_name='展示类型')
      content = models.CharField(max_length=500, blank=True, verbose_name='内容',
                                 help_text='如果设置的不是HTML类型，可为空')
      status = models.PositiveIntegerField(default=STATUS_SHOW, choices=STATUS_ITEMS,
                                           verbose_name='状态')
      owner = models.ForeignKey(User, verbose_name='作者')
      created_time = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
  
      class Meta:
          verbose_name = verbose_name_plural = '侧边栏'
  
      @classmethod
      def get_all(cls):
          # import time
          # time.sleep(1)
          return cls.objects.filter(status=cls.STATUS_SHOW).order_by('display_type')
  
      @property
      def content_html(self):
          """ 直接渲染模板 """
          from blog.models import Post  # 避免循环引用
          from comment.models import Comment
  
          result = ''
          if self.display_type == self.DISPLAY_HTML:
              result = self.content
          elif self.display_type == self.DISPLAY_LATEST:
              context = {
                  'posts': Post.latest_posts(with_related=False)[:5]
              }
              result = render_to_string('config/blocks/sidebar_posts.html', context)
          elif self.display_type == self.DISPLAY_HOT:
              context = {
                  'posts': Post.hot_posts()[:5]
              }
              result = render_to_string('config/blocks/sidebar_posts.html', context)
          elif self.display_type == self.DISPLAY_COMMENT:
              context = {
                  'comments': Comment.objects.filter(status=Comment.STATUS_NORMAL)[:5]
              }
              result = render_to_string('config/blocks/sidebar_comments.html', context)
          return result
  