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require 'dm-core' | |
require 'dm-migrations' | |
class PetSpecies | |
include DataMapper::Resource | |
has n, :pets | |
has n, :people, :through => :pets | |
property :id, Serial | |
def self.filter | |
all.map{|k| ["species_ #{k.id}"]} | |
end | |
end | |
class Pet | |
include DataMapper::Resource | |
belongs_to :pet_species | |
belongs_to :person | |
property :id, Serial | |
def self.filter | |
all.map{|k| ["pet_ #{k.id}"]} | |
end | |
end | |
class Person | |
include DataMapper::Resource | |
has n, :pets | |
has n, :pet_species, :through => :pets | |
property :id, Serial | |
def self.filter | |
all.map{|k| ["person_ #{k.id}"]} | |
end | |
end | |
DataMapper.setup(:default, 'sqlite:///tmp/testdb') | |
DataMapper.auto_migrate!! | |
DataMapper.finalize | |
s = PetSpecies.create | |
p = Person.create | |
3.times{ | |
Pet.create(:person => p, :pet_species => s) | |
} | |
p.pet_species # does not raise | |
p.pet_species.filter # raises | |
s.people # does not raise | |
s.people.filter # raises | |
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