Nicer Image uploads for simple_form with jasny bootstrap

nice_image_input.rb

# app/inputs/nice_image_input.rb
class NiceImageInput < SimpleForm::Inputs::Base
  def input
    template.content_tag(:div, class: "fileupload fileupload-new", data: { provides: "fileupload" }) do
      template.concat(template.content_tag(:div, class: "fileupload-new thumbnail", style: "width: 100px; height: 100px; margin-right: 4px;") do
        template.image_tag(object.image.url(:thumb), class: "input-prepend", size:"100x100")
      end)
      template.concat(template.content_tag(:div, nil, class: "fileupload-preview fileupload-exists thumbnail", style: "width: 100px; height: 100px; margin-right: 4px;"))
      template.concat(template.content_tag(:span, class:"btn btn-file") do
        template.concat(template.content_tag(:span, "Select image", class: "fileupload-new"))
        template.concat(template.content_tag(:span, "Select image", class: "fileupload-exists"))
        template.concat(@builder.file_field attribute_name, input_html_options)
      end)
    end
  end
end

# Use with f.input :image, :as => :nice_image