Added custom templatetag get_latest_blog_entry for django_website

git-svn-id: http://code.djangoproject.com/svn/djangoproject.com@33 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django_website/apps/blog/models/blog.py

@@ -11,6 +11,7 @@ class Entry(meta.Model):
         meta.CharField('author', 'author', maxlength=100),
     )
     ordering = (('pub_date', 'DESC'),)
+    get_latest_by = 'pub_date'
     admin = meta.Admin(
         fields = (
             (None, {'fields': ('pub_date', 'slug', 'author', 'headline', 'body')}),

django_website/apps/blog/templatetags/latestblogentry.py

@@ -0,0 +1,27 @@
+from django.core import template
+from django.models.blog import entries
+
+class LatestBlogEntryNode(template.Node):
+    def __init__(self, varname):
+        self.varname = varname
+
+    def render(self, context):
+        try:
+            e = entries.get_latest()
+        except entries.EntryDoesNotExist:
+            e = None
+        context[self.varname] = e
+        return ''
+
+def do_get_latest_blog_entry(parser, token):
+    """
+    {% get_latest_blog_entry as latest_entry %}
+    """
+    bits = token.contents.split()
+    if len(bits) != 3:
+        raise template.TemplateSyntaxError, "'%s' tag takes two arguments" % bits[0]
+    if bits[1] != 'as':
+        raise template.TemplateSyntaxError, "First argument to '%s' tag must be 'as'" % bits[0]
+    return LatestBlogEntryNode(bits[2])
+
+template.register_tag('get_latest_blog_entry', do_get_latest_blog_entry)