first.rb

#!/usr/bin/env ruby

require "init"

p = Post.new
p.title = "first"
p.content = "hello world, this is my first entity"
p.save

init.rb

require "rubygems"
require "data_mapper"

$:.unshift "models"

DataMapper.setup(
  :default,
  "sqlite3://#{File.expand_path(File.dirname(__FILE__))}/test.sqlite3"
)

require "user"
require "post"

# DataMapper.auto_migrate!

post.rb

class Post
  include DataMapper::Resource
  property :id,       Serial,    :key => true
  property :title,    String
  property :content,  Text
end

simple.rb

#!/usr/bin/env ruby

require "init"

p = Post.all
puts p.class
p.each do |ppp|
  puts ppp.title
  puts ppp.content
end

user.rb

class User
  include DataMapper::Resource
  property :id, Serial, :key => true
  property :name, String
  property :email, String
  property :gender, String
end