class Xcodeproj::Project::Object::Association::HasOne

def direct_get
  @owner.project.objects[@owner.send(@reflection.attribute_getter)]
end

def direct_set(object)
  @owner.send(@reflection.attribute_setter, object.uuid)
end

def inverse_get
  # Loop over all objects of the class and find the one that includes
  # this object in the specified uuid list.
  @owner.project.objects.list_by_class(@reflection.klass).find do |object|
    object.send(@reflection.inverse.attribute_getter).include?(@owner.uuid)
  end
end

def inverse_set(object)
  # Remove this object from the uuid list of the target
  # that this object was associated to.
  if previous = @owner.send(@reflection.name)
    previous.send(@reflection.inverse.attribute_getter).delete(@owner.uuid)
  end
  # Now assign this object to the new object
  object.send(@reflection.inverse.attribute_getter) << @owner.uuid if object
end