properties_block.rb

class User
  include DataMapper::Resource

  property :id,         Serial
  property :name,       String
  property :age,        Integer
  property :created_at, DateTime
end

class User
  include DataMapper::Resource

  properties do
    id         Serial
    name       String
    age        Integer
    created_at DateTime
  end
end

class User
  include DataMapper::Resource

  properties do |p|
    p.serial    :id
    p.string    :name
    p.integer   :age
    p.date_time :created_at
  end
end