Paperclip exception : Paperclip::AdapterRegistry::NoHandlerError

by

This Error is raised because you aren’t giving Paperclip a correct class. It’s a just a String.

You should receive something like this in params

"asset"=>
  {"image"=>
    #<ActionDispatch::Http::UploadedFile:0x000000056679e8
    @content_type="image/jpg",
    @headers= "Content-Disposition: form-data; name=\"asset[image]\";
      filename=\"2009-11-29-133527.jpg\"\r\nContent-Type: image/jpg\r\n",
    @original_filename=""2009-11-29-133527.jpg"",
    @tempfile=#<File:/tmp/RackMultipart20120619-1043-yvc9ox>>}

And you should have something like this in yout View (in HAML, very simplified):

= form_for @product, html: { multipart: true } do |f|
  = f.fields_for :asset do |asset_form|
    = asset_form.file_field :image

Remember to set your form to multipart: true.

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