RestKit: How to manually set the value of a property of a managed object?

Question

How to manually set the value of a managed object property in RestKit when it is controlled by the object manager?

I created an RKObjectManager with persistent storage to save master data.

I added the RKEntityMapping and RKResponseDescriptor object manager.

Now I can call the object manager as follows:

[[RKObjectManager sharedManager] getObjectsAtPath:@"/path_to_ressource" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { // success } failure:^(RKObjectRequestOperation *operation, NSError *error) { // report error }]; 

And the data displays well in a UITableView (for this I use NSFetchedResultsController). Everything looks good, my data is saved.

Now I want to add a property to the entity, which depends on the key path of the response descriptor. How do I do this and where?

My first attempt:

I added a property to the main data object, and then I tried this in the success block of the code above:

 for (Entity *s in mappingResult.dictionary[@"CurrentEntities"]) { s.isCurrent = [NSNumber numberWithBool:YES]; } for (Entity *s in mappingResult.dictionary[@"OldEntities"]) { s.isCurrent = [NSNumber numberWithBool:NO]; } 

assuming json looks like this:

 { CurrentEntities: [{ id: 10, title: "bhubhbhu"}, { id: 11, title: "ezeze"}, ...], OldEntities: [{ id: 0, title: "rf-reref"}, { id: 1, title: "vcvcvcvcv"}, ...] } 

After setting a new local YES or NO property, I can really see the result in the table view, but it looks like these changes are not saved.

So any ideas?

EDIT:

Well, preserving the context seems to make the changes right:

 NSError *error = nil; [[RKManagedObjectStore defaultStore].mainQueueManagedObjectContext saveToPersistentStore:&error]; 

EDIT:

Actually, it looks like I have to keep the context after every change to the object, otherwise I get Core Data errors.

Answer 1

As you have already found, you can simply save your changes. Since the values ​​you are trying to set are not based on anything in the URL used to load data or the contents of the payload data (value), your easiest option is to simply execute the post process and save. Much more code is required to interact with the matching process and enter values.