module Geocoder::MaxmindDatabase

def table_columns(table_name)
  {
    maxmind_geolite_city_blocks: %w[start_ip_num end_ip_num loc_id],
    maxmind_geolite_city_location: %w[loc_id country region city postal_code latitude longitude metro_code area_code],
    maxmind_geolite_country: %w[start_ip end_ip start_ip_num end_ip_num country_code country]
  }[table_name.to_sym]
end