As I write this new introduction in the spring of 2010, the official release of Rails 3.0 is looming, and what a big change it represents. The “Merb-ification” of Rails is almost complete! The new Rails is quite different from its predecessors in that its underlying architecture is more modular and elegant while increasing sheer performance significantly. The changes to Active Record are dramatic, with Arel’s query method chaining replacing hashed find parameters that we were all used to.

There is a lot to love about Rails 3, and I do think that eventually most of the community will make the change. In most cases, I have not bothered to cover 2.x ways of doing things in Rails if they are significantly different from the Rails 3 ...

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