def initialize(name, source_model, target_model, options = {})
if options.key?(:nullable)
nullable_options = options.only(:nullable)
required_options = { :required => !options.delete(:nullable) }
warn "#{nullable_options.inspect} is deprecated, use #{required_options.inspect} instead (#{caller[2]})"
options.update(required_options)
end
@required = options.fetch(:required, true)
@key = options.fetch(:key, false)
target_model ||= DataMapper::Inflector.camelize(name)
options = { :min => @required ? 1 : 0, :max => 1 }.update(options)
super
end