There are many ways that can be used to submit sitemap to search engines.
Lets discuss approaches
1. Put sitemap.xml in public folder and you are done.
Crawlers will find it through url
http://yourdomain.com/sitemap.xml
2. There are many online sites which generates sitemaps for you.
like http://www.xml-sitemaps.com/
3. Open following urls in browser. Be sure to add xml sitemap path for your site.
a. Google submit
http://www.google.com/webmasters/tools/ping?sitemap=XML_SITEMAP_PATH
b. Yahoo Submit
http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=XML_SITEMAP_PATH
c. Ask Submit
http://submissions.ask.com/ping?sitemap=XML_SITEMAP_PATH
d. Webmaster submit
http://webmaster.live.com/ping.aspx?siteMap=XML_SITEMAP_PATH
5. Best practices in rails to submit sitemap is scheduled task (cron job).
Write a rake task that will generate sitemap in rails public folder and
will submit sitemap.xml file to search engines. ( as mentioned above.)
Got easy 🙂
Josh Software 
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And this is for bing:http://www.bing.com/webmaster/ping.aspx?sitemap=www.YourWebAddress.com/sitemap.xml
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Thanks for your great info. Using SitemapX can also submit and ping your Xml sitemap to any search engine. The most important is it is totally free with no-limited webpages volume.