CarrierWave version path - ruby-on-rails

Question

I have model Catagory
class Category < ActiveRecord::Base
mount_uploader :image, CategoryImageUploader
end
I need to save the image with the 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 do
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 do
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 the filename of the uploaded files:
# Avoid using model.id or version_name here, see uploader/store.rb for 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 like this 3.png 4.png
version :small and 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 to one 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"**