How do you handle the Sitemap for a user generated content website like a social media network?

I want Google to index my dynamic sitemap that gets updated every time a user creates a record

Homepage — http://looksideway.com/
Project example — https://looksideway.com/projects/122-studiotime-website
Basically I want the Sitemap to include all projects links - https://looksideway.com/projects/* (except edit routes)

As long as the page is linked somewhere, Google will usually find and index it automatically, so you may not need to do this as

You could probably use the sitemap_generator gem to create sitemaps and point Google to it. https://github.com/kjvarga/sitemap_generator