snippet.rb

require 'rubygems'
require 'dm-sqlite-adapter'
require 'data_mapper'

class Test
  include DataMapper::Resource
  property :id,           Serial
  property :title,        String,   :length => 255
  property :description,  String,   :length => 255
end

DataMapper.setup( :default, "sqlite3::memory:" )
DataMapper.auto_migrate!


create_new_record = Test.first_or_create(
  'title' =>  'A',
  'description' => 'B'
)

if create_new_record.save
  puts "New Record was saved: [#{create_new_record.inspect}]"
else
  puts "New Record was NOT saved: [#{create_new_record.inspect}]"
end

use_first_record = Test.first_or_create(
  'title' =>  'A',
  'description' => 'B'
)

if use_first_record.save
  puts "First Record was 'saved': [#{use_first_record.inspect}]"
else
  puts "First Record was NOT saved: [#{use_first_record.inspect}]"
end

puts "\nTest.all =[#{Test.all.inspect}]"