MySQL/Rails Version Control for CMS - How is it usually done?

How do projects like BrowserCMS for Rails implement version control for a CMS? What is best practic开发者_JS百科e for version control with database content? How does it relate to git/svn?

I'm not completely certain if this is what you are asking but there are a lot of solutions that use activerecord model level versioning.

Vestal Versions, acts_as_versioned, has_versions, acts_as_revisable....

It's a crowded plugin space..here is the ruby toolbox listing.