gistfile1.builder

class Tester
  include DataMapper::Resource

  property :id, Serial
  property :name, String, :required => true, :length => 75 
  property :email, String, :required => true, :length => 75, :unique_index => true
  property :comments, Text
  property :created_at, DateTime

  has n, :skills
  has n, :languages, :through => :skills
end

class Language
  include DataMapper::Resource

  property :id, Serial
  property :name, String, :unique_index => true
  property :created_at, DateTime

  has n, :skills
  has n, :testers, :through => :skills
end

class Skill
  include DataMapper::Resource
  property :language_id, Integer, :key => true
  property :tester_id, Integer, :key => true

  belongs_to :language
  belongs_to :tester
end