Untitled

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class ActivationCode
    include ActiveModel::Validations

    attr_accessor :activation_code
    validates :activation_code, :presence => true

    def initialize(activation_code)
      @activation_code = activation_code
    end
end

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class CheckController < ApplicationController
  def activation
    u = ActivationCode.new :activation_code => params[:code]
    u.valid?
  end
end