struct_new_d.rb

class Activation
  def initialize(user, activation_token)
    @user, @activation_token = user, activation_token
  end

  def activate
    if @user.activation_token == hash_token(@activation_token)
      @user.update_attributes!({
        activated_at: Time.now,
        locked_at: nil,
        activation_token: nil
      })
    end
  end
end