DataMapper example showing a few different legacy support features

datamapper_example.rb

module Commerce
  class Refund
    include DataMapper::Resource
    include Defaults
    
    PENDING    = 'pending'
    SUCCESSFUL = 'successful'
    DECLINED   = 'declined'
    ERROR      = 'error'
    
    property :id,            Serial
    property :amount,        Decimal,    :precision => 6, :scale => 2
    property :merchant_fee,  Decimal,    :precision => 6, :scale => 2, :field => 'merchantfee'
    property :status,        String,     :set => [PENDING, SUCCESSFUL, DECLINED, ERROR]
    property :gateway_key,   String,     :field => 'gatewaykey'
    property :backend_id,    String,     :field => 'backendid'
    property :error_code,    String,     :field => 'errorcode'
    property :error_message, Text,       :field => 'errormessage'
    property :created_at,    EpochTime,  :field => 'timecreated'
    property :updated_at,    EpochTime,  :field => 'timemodified'
    
    belongs_to :payment,
      'Commerce::Payment'
  end
end