Recently I found myself doing pretty interesting things with relational databases that are way, way above what
ActiveRecord allows you to do (even if I where to condone the use of SQL fragments like
Person.order('YOUR_FIELD DESC'), which I don’t). Arel, which powers
ActiveRecord is very powerful for that sort of thing, if a little under-documented. The post by Jiří Pospíšil helped out a lot.
In the post (also a talk), Zach Holman describes how Github continues to innovate and add features to their product, without breaking existing functionality. This post is interesting at the technical level, but also covers how the do team and company structure and communication in a way that doesn’t weight them down. Highly recommended.
Short post on using the Null Object Pattern. Polymorphism for the win!