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PORails 3, mongoid, carrierwave, nested object form
 

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    <p>I'm using carrierwave to upload photos to a World model. I can't seem to get the upload form right:</p> <pre><code>class World include Mongoid::Document embeds_many :photos accepts_nested_attributes_for :photos end class Photo include Mongoid::Document mount_uploader :image, WorldPhotoUploader embedded_in :world end # show.haml = form_for world, :html =&gt; {:multipart =&gt; true} do |f| = f.fields_for world.photos.build do |photo| = photo.file_field :image </code></pre> <p>This gives me this form input:</p> <pre><code>&lt;input id="world_photo_image" name="world[photo][image]" type="file"&gt; </code></pre> <p>Which doesn't work, I get</p> <pre><code>Cannot serialize an object of class ActionDispatch::Http::UploadedFile into BSON. {"utf8"=&gt;"✓", "_method"=&gt;"put", "authenticity_token"=&gt;"e2PzZlSY0NwiCqDWn7ZMNwqnypP+GC23PcMuy+uGyF0=", "world"=&gt;{"photo"=&gt;{"image"=&gt;#&lt;ActionDispatch::Http::UploadedFile:0x00000103182ac8 @original_filename="Black Box fish.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"world[photo][image]\"; filename=\"Black Box fish.jpg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#&lt;File:/var/folders/IY/IY7PGAf2F9OD6CIKr1RQo++++TI/-Tmp-/RackMultipart20110917-57084-zwoyfy&gt;&gt;}}, "commit"=&gt;"Upload", "id"=&gt;"pluto"} </code></pre> <p>The input that seems to work is:</p> <pre><code>&lt;input id="world_photo_image" name="world[photos][][image]" type="file"&gt; </code></pre> <p>But i'm not sure how to create the form to get that</p>
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