class RuboCop::Cop::Rails::ApplicationRecord

end
# …
class Rails4Model < ActiveRecord::Base
# bad
end
# …
class Rails5Model < ApplicationRecord
# good
@example
This cop checks that models subclass ApplicationRecord with Rails 5.0.

def autocorrect(node) 

def autocorrect(node)
  lambda do |corrector|
    corrector.replace(node.source_range, self.class::SUPERCLASS)
  end
end