Geocoderは既存APIをつかって地理情報を検索できる便利Gemです 導入 $ gem install geocoder 基本的な使い方 Geocoder.configure(language: "ja", units: "km", :lookup => :google) => {:timeout=>3, :lookup=>:google, :ip_lookup=>:freegeoip, :language=>"ja", :http_headers=>{}, :use_https=>false, :http_proxy=>nil, :https_proxy=>nil, :api_key=>nil, :cache=>nil, :cache_prefix=>"geocoder:", :always_raise=>[], :units=>"km", :distances=>:linear,