From df7a6f20337b159c81a05883e6f85661007b74a8 Mon Sep 17 00:00:00 2001
From: Harrison Shoff <hi@hshoff.com>
Date: Fri, 8 Mar 2013 16:27:54 -0800
Subject: [PATCH] add documentation about collections containing polymorphic
 models. Fixes #2338

---
 index.html | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/index.html b/index.html
index b8a399ae..303d57c4 100644
--- a/index.html
+++ b/index.html
@@ -1493,6 +1493,25 @@ bill.set({name : "Bill Jones"});
 var Library = Backbone.Collection.extend({
   model: Book
 });
+</pre>
+
+    <p>
+      A collection can also contain polymorphic models by overriding this property
+      with a function that returns a model.
+    </p>
+
+<pre>
+var Library = Backbone.Collection.extend({
+
+  model: function(attrs, options) {
+    if (condition) {
+      return new PublicDocument(attrs, options);
+    } else {
+      return new PrivateDocument(attrs, options);
+    }
+  }
+
+});
 </pre>
 
     <p id="Collection-constructor">