config/initializers/app_config.rb - load all config/*.yml files at APP_CONFIG

app_config.rb

conf_files = Dir[Rails.root.join('config/*.yml')]

if conf_files.any?
  configs = {}

  conf_files.each do |filename|
    key_name = File.basename(filename).gsub(File.extname(filename), '')

    begin
      configuration = YAML.load_file(filename)[Rails.env]

      configs[key_name] = OpenStruct.new(configuration)
    rescue Exception => e
      Rails.logger.error "Configurations File #{filename} not loaded."
    end

  end

  APP_CONFIG = OpenStruct.new(configs) if configs.any?
end