rails/rails — pull request #8496 by ptn (2012-12-12 17:48:06+00:00)
Title: Link to Active Record Basics guide

I discovered that the Active Record Basics guide is not in the guides index. Since this is the introduction to a very big and important module, I figured it should be revived.

I'm currently in the process of reading it whole to identify what should be brought up to date, so I open a PR to gather all comments and opinions.

/cc. @fxn @vijaydev