This snippet below should do the trick. The main difference is to call super initWithEntity:insertIntoManagedObjectContext:
- (id)initWithCoder:(NSCoder *)aDecoder {
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Test" inManagedObjectContext:<YourContext>];
self = [super initWithEntity:entity insertIntoManagedObjectContext:nil];
NSArray * attributeNameArray = [[NSArray alloc] initWithArray:self.entity.attributesByName.allKeys];
for (NSString * attributeName in attributeNameArray) {
[self setValue:[aDecoder decodeObjectForKey:attributeName] forKey:attributeName];
}
return self;
}
Above snippet will handle only the attributes, no relationships. Dealing with relationships as NSManagedObjectID
using NSCoding
is horrible. If you do need to bring relationships across consider introducing an extra attribute to match the two (or many) entities when decoding.
how to obtain <YourContext>
(based on a now unavailable post by Sam Soffes, code taken from https://gist.github.com/soffes/317794#file-ssmanagedobject-m)
+ (NSManagedObjectContext *)mainContext {
AppDelegate *appDelegate = [AppDelegate sharedAppDelegate];
return [appDelegate managedObjectContext];
}
Note: replace <YourContext>
in the first snippet with mainContext