The operation couldn’t be completed. (Cocoa error 1560.)
core-data, ios, ios5, iphone, objective-c
Solution
Basically directly storing an `NSArray` or an `NSDictionary` as a transformable attribute won't work in CoreData because it will be unable to retrieve the array's values.
See Marcus's answer which suggests just using relationships:
NSMutableArray stored with core data = WORKS, but after changing array DOESN'T WORK
BUT!
You can archive your array so that it CAN be used in your managed object. See jbrennan's response here: Saving an NSMutableArray to Core Data
Problem
i am using core data in my application. i am getting this error when using transformable attribute to store NSArray. in short i want to know, what should i do to store NSArray into core data. and how to retrive it. this is my code. ``` #import <CoreData/CoreData.h> @class category; @interface qrandom : NSManagedObject { } @property (nonatomic, retain) NSArray* arr; @property (nonatomic, retain) category * cid; @end ``` ........................................................................................... ``` #import "qrandom.h" #import "category.h" @implementation qrandom @dynamic arr; @dynamic cid; @end ``` ................................................................... category.h file ``` #import <CoreData/CoreData.h> @class qrandom; @interface category : NSManagedObject { } @property (nonatomic, retain) NSNumber * cid; @property (nonatomic, retain) qrandom * randomrelation; @end ``` .................................................................................... category.m file ``` #import "category.h" #import "qrandom.h" @implementation category @dynamic cid; @dynamic randomrelation; @end ``` ................................................................................