Additions to NSEntityDescription and NSPropertyDescription allowing access to their localized names in an NSManagedObjectModel's -localizationDictionary. Localization dictionary key reference: http://bit.ly/e9O8RK

GenModelStrings.py

#
# A short script to generate a xxModel.strings for a given xx.xcdatamodel file.
#
from objc import YES, NO, NULL
from Foundation import *
from CoreData import NSManagedObjectModel
from os import popen as system, rmdir, remove
from optparse import OptionParser
from tempfile import mkdtemp
import sys

MOMC_PATH = '/Developer/usr/bin/momc'

if __name__ == '__main__':
	parser = OptionParser(usage='Usage: %prog [options] model', conflict_handler='resolve')
	parser.add_option('-h', '--help', action='help', 
		help='show this help message and exit')
	parser.add_option('-o', '--output', dest='outfile', 
		metavar='OUTFILE', help='write output to <file> instead of stdout')
	parser.add_option('-m', '--momc', dest='momc', default=MOMC_PATH, 
		metavar='MOMC', help='path to the momc binary (defaults to /Developer/usr/bin/momc)')
	
	(options, args) = parser.parse_args()
	
	if len(args) < 1:
		parser.error('you must provide a .xcdatamodel file')
	
	if options.outfile is not None:
		outfile = open(options.outfile, 'w')
	else:
		outfile = sys.stdout
	
	tmp = mkdtemp()
	mom = tmp + '/model.mom'
	print mom
	system('%s %s %s' % (options.momc, args[0], mom))

	model = NSManagedObjectModel.alloc().initWithContentsOfURL_(NSURL.fileURLWithPath_(mom))
	remove(mom)
	rmdir(tmp)
	
	descriptors = [NSSortDescriptor.sortDescriptorWithKey_ascending_('name', YES)]
	entities = model.entities().sortedArrayUsingDescriptors_(descriptors)
	
	for anEntity in entities:
		entityName = anEntity.name()
		outfile.write('"Entity/%s" = "%s";\n' % (entityName, entityName))
		properties = anEntity.properties().sortedArrayUsingDescriptors_(descriptors)
		for aProperty in properties:
			propertyName = aProperty.name()
			outfile.write('"Property/%s/Entity/%s" = "%s";\n' % (propertyName, entityName, propertyName))
		outfile.write('\n')

NSEntityDescription+LocalizedName.h

//
//  NSEntityDescription+LocalizedName.h
//
//  Created by Cameron Spickert on 4/8/11.
//

@interface NSEntityDescription (LocalizedName)

@property (nonatomic, readonly) NSString *localizedName;

@end

NSEntityDescription+LocalizedName.m

//
//  NSEntityDescription+LocalizedName.m
//
//  Created by Cameron Spickert on 4/8/11.
//

#import "NSEntityDescription+LocalizedName.h"

@implementation NSEntityDescription (LocalizedName)

@dynamic localizedName;

- (NSString *)localizedName {
	static NSString *const localizedNameKeyFormat = @"Entity/%@";
	NSString *localizedNameKey = [NSString stringWithFormat:localizedNameKeyFormat, [self name]];
	NSString *localizedName = [[[self managedObjectModel] localizationDictionary] objectForKey:localizedNameKey];
  if (localizedName) {
    return localizedName;
  }
  return [self name];
}

@end

NSPropertyDescription+LocalizedName.h

//
//  NSPropertyDescription+LocalizedName.h
//
//  Created by Cameron Spickert on 4/8/11.
//

@interface NSPropertyDescription (LocalizedName)

@property (nonatomic, readonly) NSString *localizedName;

@end

NSPropertyDescription+LocalizedName.m

//
//  NSPropertyDescription+LocalizedName.m
//
//  Created by Cameron Spickert on 4/8/11.
//

#import "NSPropertyDescription+LocalizedName.h"

@implementation NSPropertyDescription (LocalizedName)

@dynamic localizedName;

- (NSString *)localizedName {
	static NSArray *localizedNameKeyFormats = nil;
	if (!localizedNameKeyFormats) {
		localizedNameKeyFormats = [[NSArray alloc] initWithObjects:@"Property/%@/Entity/%@", @"Property/%@", nil];
	}
	for (NSString *localizedNameKeyFormat in localizedNameKeyFormats) {
		NSString *localizedNameKey = [NSString stringWithFormat:localizedNameKeyFormat, [self name], [[self entity] name]];
		NSString *localizedName = [[[[self entity] managedObjectModel] localizationDictionary] objectForKey:localizedNameKey];
		if (localizedName) {
			return localizedName;
		}
	}
	return [self name];
}

@end