acts_as_list refactoring part 1

Today I'm going to refactor acts_as_list Rails library. It allows to treat Rails model records as part of an ordered list and offers methods like #move_to_bottom and #move_higher. Step 1: .acts_as_list introduction .acts_as_list is available as a class method in ActiveRecord::Base when acts_as_list gem is loaded. Here's an excerpt from .acts_as_list definition: Using ClassMethods module is customary in Rails, but it's not a requirement to be familiar with it to read this article. All you need to know is

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