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I read the similar questions, but it was not my case I think.

My view:

    = form_for [:test, @new], :remote => true do |f|
= f.label :title, 'title'
= f.text_field :title, :class => :span6

    = label :news, :image_preview, 'Изображение'
= file_field :news, :image_preview, :class => 'btn'

My controller:

def create

  uploaded_io = params[:news][:image_preview]
  File.open(Rails.root.join('public', 'uploads', uploaded_io.original_filename), 'w') do |file|
    file.write(uploaded_io.read)
  end 

end

Uploading file I get this error:

undefined method `original_filename' for "download.png":String
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