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Under the "Most Important Change" header: http://speakerdeck.com/u/alindeman/p/rails-4-dot-0-whirlwind...

I was wondering why so few police departments were using Rails.

* on a more substantial note, the biggest migration changes seem to be requiring Ruby 1.9.3+, elimination of 2.x "find" syntax, and no more vendor/plugins.

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And of those migration changes, the move to 1.9.3 will be the biggest change for shops still on 1.8. If you're already on 1.9, the move is straightforward.

Switching find syntax over is rather simple, though tedious.

Gemifying a plugin takes 30 minutes or less in my experience. It will take more time if you haven't done it before, and more time beyond that if you've never made a gem before.

Yeah, the good ol' inflector. There's actually more to it, it can use locales now and it's been cleaned up: http://davidcelis.com/blog/2012/07/31/edge-rails-a-multiling...

It's going to be a great release.

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