Added error logging and notifications for persistent data store failures.

Code/RKManagedObjectStore.m

@@ -7,6 +7,9 @@
 //
 
 #import "RKManagedObjectStore.h"
+#import <UIKit/UIKit.h>
+
+NSString* const RKManagedObjectStoreDidFailSaveNotification = @"RKManagedObjectStoreDidFailSaveNotification";
 
 @interface RKManagedObjectStore (Private)
 - (void)createPersistentStoreCoordinator;
@@ -61,6 +64,10 @@
 		[alert release];
 	} 
 	@finally {
+		if (error) {
+			NSDictionary* userInfo = [NSDictionary dictionaryWithObject:error forKey:@"error"];
+			[[NSNotificationCenter defaultCenter] postNotificationName:RKManagedObjectStoreDidFailSaveNotification object:self userInfo:userInfo];
+		}
 		return error;
 	}
 }

Code/RKMappingFormatJSONParser.h

@@ -7,9 +7,10 @@
 //
 
 #import "RKModelMapper.h"
+#import "JSON.h"
 
 @interface RKMappingFormatJSONParser : NSObject <RKMappingFormatParser> {
-
+	SBJSON* _parser;
 }
 
 @end

Code/RKMappingFormatJSONParser.m

@@ -7,12 +7,30 @@
 //
 
 #import "RKMappingFormatJSONParser.h"
-#import "JSON.h"
 
 @implementation RKMappingFormatJSONParser
 
+- (id)init {
+	if (self = [super init]) {
+		_parser = [[SBJSON alloc] init];
+	}
+	
+	return self;
+}
+
+- (void)dealloc {
+	[_parser release];
+	[super dealloc];
+}
+
 - (NSDictionary*)objectFromString:(NSString*)string {
-	return [[[[SBJSON alloc] init] autorelease] objectWithString:string];
+	id result = [_parser objectWithString:string];
+	if (nil == result) {
+		// TODO: Need to surface these errors in a better fashion
+		NSLog(@"[RestKit] RKMappingFormatJSONParser: Parser failed with error trace: %@", _parser.errorTrace);
+	}
+	
+	return result;
 }
 
 @end

Code/RestKit/RKManagedObjectStore.h

@@ -8,6 +8,13 @@
 
 #import <CoreData/CoreData.h>
 
+/**
+ * Notifications
+ */
+extern NSString* const RKManagedObjectStoreDidFailSaveNotification;
+
+///////////////////////////////////////////////////////////////////
+
 @interface RKManagedObjectStore : NSObject {
 	NSString* _storeFilename;	
     NSManagedObjectModel* _managedObjectModel;

Code/RestKit/RKModelMapper.h

@@ -34,7 +34,6 @@
 	NSArray* _dateFormats;
 	NSTimeZone* _remoteTimeZone;
 	NSTimeZone* _localTimeZone;
-	SEL _comparisonProperty;
 }
 
 /**