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    <p>I could get this line to return the complete nested XML</p> <pre><code>format.xml { render :xml =&gt; @post.to_xml(:include =&gt; [ :links, :assets])} </code></pre> <p>like</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;post&gt; &lt;body&gt;testing.../body&gt; &lt;created-at type="datetime"&gt;2010-09-21T06:19:13Z&lt;/created-at&gt; &lt;id type="integer"&gt;1&lt;/id&gt; &lt;title&gt;1&lt;/title&gt; &lt;updated-at type="datetime"&gt;2010-09-21T06:19:13Z&lt;/updated-at&gt; &lt;links type="array"/&gt; &lt;assets type="array"&gt; &lt;asset&gt; &lt;attachable-id type="integer"&gt;1&lt;/attachable-id&gt; &lt;attachable-type&gt;Post&lt;/attachable-type&gt; &lt;created-at type="datetime"&gt;2010-09-21T06:19:13Z&lt;/created-at&gt; &lt;data-content-type&gt;image/jpeg&lt;/data-content-type&gt; &lt;data-file-name&gt;IMG00017-20100906-1226.jpg&lt;/data-file-name&gt; &lt;data-file-size type="integer"&gt;0&lt;/data-file-size&gt; &lt;id type="integer"&gt;1&lt;/id&gt; &lt;updated-at type="datetime"&gt;2010-09-21T06:19:13Z&lt;/updated-at&gt; &lt;/asset&gt; &lt;/assets&gt; &lt;/post&gt; </code></pre> <p>Here is our model</p> <pre><code>class Post &lt; ActiveRecord::Base has_many :assets, :as =&gt; :attachable, :dependent =&gt; :destroy has_many :links, :as =&gt; :linkable, :dependent =&gt; :destroy ... </code></pre> <p>Link Model</p> <pre><code>class Link &lt; ActiveRecord::Base belongs_to :linkable, :polymorphic =&gt; true ... </code></pre> <p>Asset Model</p> <pre><code>class Asset &lt; ActiveRecord::Base belongs_to :attachable, :polymorphic =&gt; true ... </code></pre> <p>In here, assets and links are not bound to any particular model. In the current usage, they are used in Post. Later on other models can use them.</p> <p>is that what you are trying to achieve?</p>
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