State Design Pattern
State Design Pattern is often overlooked in favor State Machines when it comes to Rails and object state management. However, the State Design Pattern is a highly effective open/closed solution to many state design woes.
Double Polymorphic Associations in Rails
A quick overview of using associations to define good domain descriptions as well as good behavior.
Thoughts on Interfaces for Models
After making small changes to a model, it got me thinking hard about how I build interfaces.