test.rb

class ZohoOrder
  include ActiveModel::Model
  include ActiveModel::Validations::Callbacks
  
  ZohoFields = [
    'ID',
    'Added_Time'
  ]
  
  def self.converted_zoho_attributes
    ZohoFields.map do |attr|
      attr.downcase.to_sym
    end
  end
  
  attr_accessor *converted_zoho_attributes
  
  def added_time
    Time.strptime(super, Time::DATE_FORMATS[:zoho])
  end
end