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pathsny/dm_unsaved_discriminator.rb

Created November 26, 2010 12:18
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dm_unsaved_discriminator.rb
class Pet
include DataMapper::Resource
property :id, Serial
property :name, String
property :type, Discriminator, :required => true, :index => true
end
class Dog < Pet
end
class Human
include DataMapper::Resource
property :id, Serial
has n, :pets
end
DataMapper.finalize
h = Human.new(:pets => [Pet.new(:name => "nemo"), Dog.new(:name => "fido")])
h.pets.first(:type => Dog) # => nil
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