CarrierWave and multiple databases

If you are use multiple databases in your Rails application, it's important to save files in different directories, for example named like subdomains. This is my example solution:

ApplicationController.rb

def override_db
  ...
  redifine_uploaders_store_dir
end

def redifine_uploaders_store_dir
  CarrierWave::Uploader::Base.descendants.each do |d|
    d.class_eval <<-RUBY, __FILE__, __LINE__+1
      def store_dir
        "uploads/#{@current_brand.db_name}/\#{model.class.to_s.underscore}/\#{mounted_as}/\#{model.id}"
      end
    RUBY
  end
end