… dynamic finder The previous behavior was unintentional, and some people was relying on it. Now the dynamic finder will always expecting the number of arguments to be equal or greater (so you can still pass the options to it.) So if you were doing this and expecting the second argument to be nil: User.find_by_username_and_group("sikachu") You'll now get `ArgumentError: wrong number of arguments (1 for 2).` You'll then have to do this: User.find_by_username_and_group("sikachu", nil)
…es. This method will also return an empty array on an abstract class or a model that the table doesn't exists.
This will hopefully make Active Record run a bit more faster.