title: Building sitemap, getting: 'Manager' object is not subscriptable
body: <p>I am building a sitemap for Django. I mainly followed the instructions at <a href="https://docs.djangoproject.com/en/1.6/ref/contrib/sitemaps/" rel="nofollow">djangoproject sitemaps</a></p>
  
  <p>Here is my error message:</p>
  
  <pre><code>lib/python2.7/site-packages/django/core/paginator.py", line 45, in page
      return Page(self.object_list[bottom:top], number, self)
  TypeError: 'Manager' object is not subscriptable
  </code></pre>
  
  <p>Here is my sitemap.py:
  from django.contrib.sitemaps import Sitemap
  from blog.models import Article</p>
  
  <pre><code>class BlogSitemap(Sitemap):
      changefreq = "monthly"
      priority = 0.5
  
      def items(self):
          return Article.objects
  
      def lastmod(self, obj):
          return obj.created_at
  
      def location(self, obj):
          return obj.get_absolute_url(False)
  </code></pre>
  
  <p>Here is my urls.py:</p>
  
  <pre><code>sitemaps = {
      'blog' : BlogSitemap,
      }
  urlpatterns = ...
      ...),
        url(r'^sitemap.xml$', 'django.contrib.sitemaps.views.sitemap', {'sitemaps': sitemaps})
          )
  </code></pre>
  
  <p>How do I go about getting my sitemap.xml up and running?</p>