DataMapper setup default sqlite3 Dir pwd mydatabase sqlite3 class Topi

DataMapper.setup(:default, "sqlite3://#{Dir.pwd}/mydatabase.sqlite3")

class Topic
  include DataMapper::Resource

  property :id,         Serial
  property :title,      String
  property :body,       Text
  property :added,      DateTime

  belongs_to :author, :class_name => 'User', :child_key => [:author_id]
end

class User
  include DataMapper::Resource

  property :id,         Serial
  property :login,      String

  has n, :topics
end

DataMapper.auto_migrate!