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PORails 3 polymorphic association with Carrierwave and Simple Form
 

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  1. PORails 3 polymorphic association with Carrierwave and Simple Form
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    <p>I'm trying to set up a polymorphic association for photo uploads which are processed using Carrierwave. I'm using Simple Form to build my forms. I feel like the association is correct so I'm wondering if my problem is just something with the form or controller.</p> <p>Here are my associations:</p> <p>property.rb:</p> <pre><code>class Property &lt; ActiveRecord::Base attr_accessible :image ... has_many :image, :as =&gt; :attachable ... end </code></pre> <p>unit.rb</p> <pre><code>class Unit &lt; ActiveRecord::Base attr_accessible :image ... has_many :image, :as =&gt; :attachable end </code></pre> <p>image.rb</p> <pre><code>class Image &lt; ActiveRecord::Base belongs_to :attachable, :polymorphic =&gt; true mount_uploader :image, PhotoUploader end </code></pre> <p>properties_controller.rb:</p> <pre><code>def edit @property = Property.find params[:id] @property.image.build if @property.image.empty? end def update @property = Property.find params[:id] if @property.update_attributes params[:property] redirect_to admin_properties_path, :notice =&gt; 'The property has been successfully updated.' else render "edit" end end </code></pre> <p>Snippet from properties/_form.html.erb</p> <pre><code>&lt;%= f.input :image, :label =&gt; 'Image:', :as =&gt; :file %&gt; </code></pre> <p>Here is the error I get when submitting with an image attached:</p> <pre><code>undefined method `each' for #&lt;ActionDispatch::Http::UploadedFile:0x00000102291bb8&gt; </code></pre> <p>And here are the params:</p> <pre><code>{"utf8"=&gt;"✓", "_method"=&gt;"put", "authenticity_token"=&gt;"lvB7EMdc7juip3gBZD3XhCLyiv1Vwq/hIFdb6f1MtIA=", "property"=&gt;{"name"=&gt;"Delaware Woods", "address"=&gt;"", "city"=&gt;"", "state"=&gt;"", "postal_code"=&gt;"", "description"=&gt;"2 bedroom with large kitchen. Garage available", "incentives"=&gt;"", "active"=&gt;"1", "feature_ids"=&gt;[""], "user_ids"=&gt;[""], "image"=&gt;#&lt;ActionDispatch::Http::UploadedFile:0x00000102291bb8 @original_filename="wallpaper-4331.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"property[image]\"; filename=\"wallpaper-4331.jpg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#&lt;File:/tmp/RackMultipart20120608-3102-13f3pyv&gt;&gt;}, "commit"=&gt;"Update Property", "id"=&gt;"18"} </code></pre> <p>I'm looking everywhere for help on polymorphic associations and am getting nowhere. I've seen simple examples that look pretty straight forward. One thing I've noticed is that it seems like in a lot of the examples the has_many association in my case should be <code>images</code> and not <code>image</code>. However when I do that I get an error:</p> <pre><code>Can't mass-assign protected attributes: image </code></pre> <p>I've tried updating my form to use fields_for as I've seen in other blogs like so:</p> <pre><code>&lt;%= f.input :image, :label =&gt; "Photo", :as =&gt; :file %&gt; &lt;% f.simple_fields_for :images do |images_form| %&gt; &lt;%= images_form.input :id, :as =&gt; :hidden %&gt; &lt;%= images_form.input :attachable_id, :as =&gt; :hidden %&gt; &lt;%= images_form.input :attachable_type, :as =&gt; :hidden %&gt; &lt;%= images_form.input :image, :as =&gt; :file %&gt; &lt;% end %&gt; </code></pre> <p>All I know is I'm having a heck of a time getting this to work. I'm pretty new to Rails so even debugging it is difficult. It doesn't help that the debugger doesn't really work in 3.2 :(</p>
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