title: Rails model without database
body: <p>I want to create a Rails (2.1 and 2.2) model with ActiveRecord validations, but without a database table.  What is the most widely used approach?  I've found some plugins that claim to offer this functionality, but many of them don't appear to be widely used or maintained.  What does the community recommend I do?  Right now I am leaning toward coming up with my own solution based on <a href="http://www.prestonlee.com/2007/12/29/rails-20-validations-without-extending-activerecordbase/" rel="noreferrer">this blog post</a>.</p>