new file mode 100644
--- /dev/null
+++ b/examples/tutorial/geddit/model.py
@@ -0,0 +1,71 @@
+from datetime import datetime
+
+
+class Submission(object):
+
+    def __init__(self, username, url, title):
+        self.username = username
+        self.url = url
+        self.title = title
+        self.time = datetime.utcnow()
+        self.comments = []
+
+    def __repr__(self):
+        return '<%s %r>' % (type(self).__name__, self.title)
+
+    def add_comment(self, username, content):
+        comment = Comment(username, content, in_reply_to=self)
+        self.comments.append(comment)
+        return comment
+
+    @property
+    def code(self):
+        uid = tuple([self.username, self.url, self.title, self.time])
+        return hex(hash(uid))[2:]
+
+    @property
+    def total_comments(self):
+        retval = []
+        for comment in self.comments:
+            retval.append(comment)
+            retval.extend(comment.total_replies)
+        return retval
+
+
+class Comment(object):
+
+    def __init__(self, username, content, in_reply_to=None):
+        self.username = username
+        self.content = content
+        self.in_reply_to = in_reply_to
+        self.time = datetime.utcnow()
+        self.replies = []
+
+    def __repr__(self):
+        return '<%s>' % (type(self).__name__)
+
+    def add_reply(self, username, content):
+        reply = Comment(username, content, in_reply_to=self)
+        self.replies.append(reply)
+        return reply
+
+    @property
+    def code(self):
+        uid = tuple([self.in_reply_to.code, self.username, self.time])
+        return hex(hash(uid))[2:]
+
+    @property
+    def submission(self):
+        ref = self.in_reply_to
+        while ref:
+            if isinstance(ref, Submission):
+                return ref
+            ref = ref.in_reply_to
+
+    @property
+    def total_replies(self):
+        retval = []
+        for reply in self.replies:
+            retval.append(reply)
+            retval.extend(reply.total_replies)
+        return retval