ruby on rails - CarrierWave version path -

i have model catagory

class category < activerecord::base       mount_uploader :image, categoryimageuploader     end 

i need save image name (id saved category)

class categoryimageuploader < carrierwave::uploader::base    include carrierwave::rmagick    storage :file     mounted:   def store_dir     #"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"     "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"   end   def store_path(for_file = filename)     "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}/#{for_file}"   end    version :small     process resize_to_fit: [48, 48]     def filename(uploaded_file = file)       if uploaded_file.present?         "small_#{model.id}.#{uploaded_file.extension}"       end     end   end   version :big     process resize_to_fit: [200, 200]     def filename(uploaded_file = file)       if uploaded_file.present?         "big_#{model.id}.#{uploaded_file.extension}"       end     end   end    def filename(uploaded_file = file)     if uploaded_file.present?       "#{model.id}.#{uploaded_file.extension}"     end   end   # override filename of uploaded files:   # avoid using model.id or version_name here, see uploader/store.rb details.   # def filename   #   "something.jpg" if original_filename   # end end 

i'm use https://coderwall.com/p/mulldw/custom-file-names-with-carrierwave-and-amazon-s3 to save image this 3.png 4.png

version :small , version :big aslo save (like big_3.png small_3.png )

but

**category.last.image_url =>  "/uploads/category/image/10/10.png"  category.last.image_url(:small) = >  "/uploads/category/image/10/10.png" category.last.image_url(:big) = >  "/uploads/category/image/10/10.png"** 

all links lead 1 image 10.png

i need

  **category.last.image_url =>  "/uploads/category/image/10/10.png"      category.last.image_url(:small) = >  "/uploads/category/image/10/small_10.png"     category.last.image_url(:big) = >  "/uploads/category/image/10/big_10.png"**