country and state utility actions

country_and_state_lists.rb

# requires geonames_api gem

# config/initializers/geo_names.rb
GeoNamesAPI.username = ENV["GEONAMES_USERNAME"]
GeoNamesAPI.lang = :en

# utility routes
get  '/utilities/country_list(.:format)', to: 'utilities#country_list', as: :country_list
get  '/utilities/state_list/:country(.:format)', to: 'utilities#state_list', as: :state_list

# actions

# USAGE: /utilities/country_list.json
def country_list
  countries = GeoNamesAPI::Country.all.map { |country| [country.country_name, country.country_code] }

  respond_to do |format|
    format.json { render json: countries }
  end
end

# USAGE: /utilities/state_list/US.json
def state_list
  country_id = GeoNamesAPI::Country.find(params[:country]).geoname_id
  states = GeoNamesAPI::Children.all(country_id).map { |state| [state.admin_name1, state.alternate_names['abbr']] }

  respond_to do |format|
    format.json { render json: states }
  end
end