trying to get the code to format right, here it is again (hopefully better!):

class MyDocument < NSDocument

attr_accessor :loadedmodel, :root #outlet to model field of controller

# Name of nib containing document window

def windowNibName

'MyDocument'

end

# Document data representation for saving (return NSData)

def dataOfType(type, error:outError)

outError.assign(NSError.errorWithDomain(NSOSStatusErrorDomain, code:-4, userInfo:nil))

NSKeyedArchiver.archivedDataWithRootObject(@root.model)

end

# Read document from data (return non-nil on success)

def readFromData(data, ofType:type, error:outError)

outError.assign(NSError.errorWithDomain(NSOSStatusErrorDomain, code:-4, userInfo:nil))

@loadedmodel = NSKeyedUnarchiver.unarchiveObjectWithData(data)

end

# Return lowercase 'untitled', to comply with HIG

def displayName

fileURL ? super : super.sub(/^[[:upper:]]/) {|s| s.downcase}

end

def windowControllerDidLoadNib(aController) 

super(aController)

@root.model = @loadedmodel

NSLog("model loaded")

end

end