openproject/app/models/custom_style.rb

class CustomStyle < ActiveRecord::Base
  mount_uploader :logo, OpenProject::Configuration.file_uploader

  class << self
    def current
      RequestStore.fetch(:current_custom_style) do
        custom_style = CustomStyle.order('created_at DESC').first
        if custom_style.nil?
          return nil
        else
          custom_style
        end
      end
    end
  end

  def digest
    updated_at.to_i
  end
end