Rails 4.0 has been out now for a while. Itâs brought some great new features but as always there have been a few bugs too. And two of them that have been annoying me especially much will be fixed in Rails 4.1. Hooray! \o/ 1. has_one associations will stop always using ORDER BY id Best to illustrate this with an example (taken from the corresponding rails/rails#12623 issue) class User < ActiveRecor

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