Implementation of Object Mapping 2.0 design:

* Removed RestKit from inheritance hierarchy
  * Mappings are implemented as concrete classes
  * Mapper is much more flexible & powerful
  * Much more robust error handling
  * Serialization is reimplemented as an object mapping operation
  * Added ability to serialize to JSON natively
  * Reworked Core Data integration
  * Simplified the codebase substantially

Code/ObjectMapping/RKObjectAttributeMapping.m

@@ -0,0 +1,47 @@
+//
+//  RKObjectElementMapping.m
+//  RestKit
+//
+//  Created by Blake Watters on 4/30/11.
+//  Copyright 2011 Two Toasters. All rights reserved.
+//
+
+#import "RKObjectAttributeMapping.h"
+
+@implementation RKObjectAttributeMapping
+
+@synthesize sourceKeyPath = _sourceKeyPath;
+@synthesize destinationKeyPath = _destinationKeyPath;
+
+/**
+ @private
+ */
+- (id)initWithSourceKeyPath:(NSString*)sourceKeyPath andDestinationKeyPath:(NSString*)destinationKeyPath {
+    NSAssert(sourceKeyPath != nil, @"Cannot define an element mapping an element name to map from");
+    NSAssert(destinationKeyPath != nil, @"Cannot define an element mapping without a property to apply the value to");
+    self = [super init];
+    if (self) {
+        _sourceKeyPath = [sourceKeyPath retain];
+        _destinationKeyPath = [destinationKeyPath retain];
+    }
+    
+    return self;
+}
+
+- (void)dealloc {
+    [_sourceKeyPath release];
+    [_destinationKeyPath release];
+    
+    [super dealloc];
+}
+
+- (NSString*)description {
+    return [NSString stringWithFormat:@"RKObjectKeyPathMapping: %@ => %@", self.sourceKeyPath, self.destinationKeyPath];
+}
+
++ (RKObjectAttributeMapping*)mappingFromKeyPath:(NSString*)sourceKeyPath toKeyPath:(NSString*)destinationKeyPath {
+    RKObjectAttributeMapping* mapping = [[self alloc] initWithSourceKeyPath:sourceKeyPath andDestinationKeyPath:destinationKeyPath];
+    return [mapping autorelease];
+}
+
+@end