lib/china_aqi/helper/city_stations.rb
module ChinaAqi
# All monitoring station names in one city
class CityStations < DynamicBase
self.method = :station_names
end
# create a helper in ChinaAqi module
def get_stations_for_city(city)
CityStations.new(city).get
end
module_function :get_stations_for_city
end