gistfile1.rb

require "rubygems"
require "dm-core"
require "spec"

DataMapper.setup(:default, "sqlite3::memory:")

class Person
  include DataMapper::Resource
  property :id, Serial
  has 1, :profile
end

class Profile
  include DataMapper::Resource
  property :id, Serial
  property :person_id, Integer, :nullable => false
  belongs_to :person
end

describe "DataMapper::Associations::OneToOne::Relationship" do
  before(:each) do
    DataMapper.auto_migrate!
  end
  it "should allow to assign an already created resource" do
    person  = Person.create
    profile = Profile.create(:person => person)
    person.profile = profile
    person.save
    Person.all.size.should  == 1
    Profile.all.size.should == 0
  end
end

# NoMethodError in 'DataMapper::Associations::OneToOne::Relationship should allow to assign an already created resource'
# undefined method `any?' for nil:NilClass
# /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.10.0/lib/dm-core/resource.rb:827:in `child_associations'
# /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.10.0/lib/dm-core/resource.rb:818:in `each_value'
# /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.10.0/lib/dm-core/resource.rb:818:in `child_associations'
# /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.10.0/lib/dm-core/resource.rb:714:in `save_children'
# /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.10.0/lib/dm-core/resource.rb:706:in `_save'
# /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.10.0/lib/dm-core/resource.rb:339:in `save'
# /opt/local/lib/ruby/gems/1.8/gems/dm-validations-0.10.0/lib/dm-validations.rb:56:in `save'
# ./test.rb:28: