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    <p>I didn't use it, but I googled around and looked into Rails sources and I think that what you're looking for is <code>:foreign_type</code>. Try it and tell if it works :)</p> <pre><code>has_one :secondary_photo, :as =&gt; :attachable, :class_name =&gt; "Photo", :dependent =&gt; :destroy, :foreign_type =&gt; 'SecondaryPost' </code></pre> <p>I think that type in your question should be <code>Post</code> instead of <code>Photo</code> and, respectively, it would be better to use <code>SecondaryPost</code> as it assigned to <code>Post</code> model.</p> <p>EDIT:</p> <p>Above answer is completly wrong. <code>:foreign_type</code> is availble in polymorphic model in <code>belongs_to</code> association to specify name of the column that contains type of associated model.</p> <p>As I look in Rails sources, this line sets this type for association:</p> <pre><code>dependent_conditions &lt;&lt; "#{reflection.options[:as]}_type = '#{base_class.name}'" if reflection.options[:as] </code></pre> <p>As you can see it uses <code>base_class.name</code> to get type name. As far as I know you can do nothing with it.</p> <p>So my sugestion is to add one column to Photo model, on example: <code>photo_type</code>. And set it to 0 if it is first photo, or set it to 1 if it is second photo. In your associations add <code>:conditions =&gt; {:photo_type =&gt; 0}</code> and <code>:conditions =&gt; {:photo_type =&gt; 1}</code>, respectively. I know it is not a solution you are looking for, but I can't find anything better. By the way, maybe it would be better to just use <code>has_many</code> association?</p>
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    1. PORails Polymorphic Association with multiple associations on the same model
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    1. USklew
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    1. COUnfortunately Rails 2.1 doesn't have foreign_type
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      1. USMatt Rogish
    2. COI think it was added around 2.3. So I think that there is no other way of doing what you want. You can try adding this feature manualy or, what is much better, upgrade your application to 2.3.5 and always stay on latest version.
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    3. COI tried w/Rails 2.3.5 and it still tells me unknown key: foreign_type :(
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