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Positioned module

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positioned.rb
Ruby
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# Example:
#
# class Page < ActiveRecord::Base
# include Positioned
# end
 
module Positioned
def self.included model_class
model_class.class_eval do
before_save :set_position
end
end
 
protected
def set_position
self.position ||= 1 + eval("#{self.class.to_s}.maximum(:position)").to_i
end
end

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