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POrails 3 polymorphic association with paperclip and multiple models
 

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    <p>I want to make polymorphic associations with paperclip, and allow my user to have one avatar and multiple images.</p> <p><strong>Attachment</strong> model:</p> <pre><code>class Attachment &lt; ActiveRecord::Base belongs_to :attachable, :polymorphic =&gt; true end class Avatar &lt; Attachment has_attached_file :image, :styles =&gt; { :thumb =&gt; "150x150&gt;", :view =&gt; "260x180&gt;" }, end class Image &lt; Attachment has_attached_file :image, :styles =&gt; { :thumb =&gt; "150x150&gt;", :view =&gt; "260x180&gt;" }, end </code></pre> <p>User Model:</p> <pre><code>has_one :avatar, :as =&gt; :attachable, :class_name =&gt; 'Attachment', :conditions =&gt; {:type =&gt; 'avatar'} accepts_nested_attributes_for :avatar </code></pre> <p>User Controller:</p> <pre><code>def edit @user.build_avatar end </code></pre> <p>User View form:</p> <pre><code>&lt;%= form_for @user, :html =&gt; { :multipart =&gt; true } do |f| %&gt; &lt;%= f.fields_for :avatar do |asset| %&gt; &lt;% if asset.object.new_record? %&gt; &lt;%= asset.file_field :image %&gt; &lt;% end %&gt; &lt;% end %&gt; </code></pre> <p>when I attempt to save the changes I get the error => unknown attribute: avatar</p> <p>if I remove the :class_name => 'attachment' in the has_one association I get the error => uninitialized constant User::Avatar</p> <p>I need to also attach avatars to blog posts, so I need the association to be polymorphic (or atleast i think so)</p> <p>I am stumped and any help would be greatly appreciated.</p>
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