Added support for configuring objectClass using the class name instead of Class object.

Author: blakewatters

Code/ObjectMapping/RKObjectMapping.h

@@ -59,6 +59,13 @@ relationship. Relationships are processed using an object mapping as well.
  */
 @property (nonatomic, assign) Class objectClass;
 
+/**
+ The name of the target class the receiver defines a mapping for.
+
+ @see objectClass
+ */
+@property (nonatomic, copy) NSString *objectClassName;
+
 /**
  The aggregate collection of attribute and relationship mappings within this object mapping
  */
@@ -146,6 +153,14 @@ relationship. Relationships are processed using an object mapping as well.
  */
 + (id)mappingForClass:(Class)objectClass;
 
+/**
+ Creates and returns an object mapping for the class with the given name
+
+ @param objectClassName The name of the class the mapping is for.
+ @return A new object mapping with for the class with given name.
+ */
++ (id)mappingForClassWithName:(NSString *)objectClassName;
+
 /**
  Returns an object mapping useful for configuring a serialization mapping. The object
  class is configured as NSMutableDictionary

Code/ObjectMapping/RKObjectMapping.m

@@ -45,6 +45,10 @@ + (id)mappingForClass:(Class)objectClass {
     return [mapping autorelease];
 }
 
++ (id)mappingForClassWithName:(NSString *)objectClassName {
+    return [self mappingForClass:NSClassFromString(objectClassName)];
+}
+
 + (id)serializationMapping {
     return [self mappingForClass:[NSMutableDictionary class]];
 }
@@ -120,6 +124,14 @@ - (void)dealloc {
     [super dealloc];
 }
 
+- (NSString *)objectClassName {
+    return NSStringFromClass(self.objectClass);
+}
+
+- (void)setObjectClassName:(NSString *)objectClassName {
+    self.objectClass = NSClassFromString(objectClassName);
+}
+
 - (NSArray *)mappedKeyPaths {
     return [_mappings valueForKey:@"destinationKeyPath"];
 }