RestKit object mapping fails depending on property name - objective-c

Question

I'm seeing some strange behavior with RestKit and mapping an object. In my destination object, if I have an NSString * property named 'description', then the entire mapping fails. Changing this to any other name, or commenting it out, everything succeeds. This happens regardless if I have a map set up for the property, and I can reproduce it in simple test classes.
The JSON the server is returning:
{
id = 1;
name = item1;
},
{
id = 2;
name = item2;
}
The object I want to map to, SimpleObject.h. Note that neither the description, nor the nonexistant property is in the JSON, meaning I don't think it's because 'description' is missing:
#import <Foundation/Foundation.h>
#interface SimpleObject : NSObject
#property (nonatomic, assign) NSInteger identifier;
#property (nonatomic, retain) NSString *name;
#property (nonatomic, retain) NSString *description;
#property (nonatomic, retain) NSString *nonexistant;
#end
SimpleObject.m:
#import "SimpleObject.h"
#implementation SimpleObject
#synthesize identifier;
#synthesize name;
#synthesize description;
#synthesize nonexistant;
#end
I create the mapping in my AppDelegate:
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURLString:#"http://127.0.0.1/test"];
// Setup our object mappings
RKObjectMapping *testMapping = [RKObjectMapping mappingForClass:[SimpleObject class]];
[testMapping mapKeyPath:#"id" toAttribute:#"identifier"];
[testMapping mapKeyPath:#"name" toAttribute:#"name"];
// Register our mappings with the provider using a resource path pattern
[objectManager.mappingProvider setObjectMapping:testMapping forResourcePathPattern:#"/products"];
Inside my didLoadObjects method, I have:
- (void)objectLoader:(RKObjectLoader *)objectLoader didLoadObjects:(NSArray *)objects
{
NSLog(#"Loaded products: %#", objects);
SimpleObject *obj = [objects objectAtIndex:0];
NSLog(#"Loaded product ID %d -> Name: %# ", obj.identifier, obj.name);
}
This outputs:
Finished performing object mapping. Results: {
"" = (
(null),
(null)
);
}
If I comment out the description property (but leave in nonexistant), then everything works:
Finished performing object mapping. Results: {
"" = (
"<SimpleObject: 0x8a4d040>",
"<SimpleObject: 0x8a50130>"
);
}
Is there a reason the mapping is failing only for this property name? If I change the name to anything other than 'description', it also succeeds.

Answer 1

It is conflicting with description property of NSObject. Rename it to other(like desc).