acts_as_list refactoring part 3

I refactor acts_as_list Ruby gem again: watch as I choose better names, strip unnecessary variables, work with some ActiveRecord internals and make code intent clearer. In this refactoring adventure I'm going to focus on just one 11-line method, and surprisingly, there's a lot of things that can be improved in just one method. You don't need to read part 2 and part 1 to understand this article. acts_as_list is a Rails gem. It allows you to treat Rails model

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