How to put Managed Object from block into ManagedObjectContext?

Question

Cocoa

Creating a managed object from a block crashes the application. You need to parse json in mo and put it in context

NSManagedObject *tempObject;
    NSManagedObjectContext *temporaryContext = [[NSManagedObjectContext alloc]initWithConcurrencyType:NSPrivateQueueConcurrencyType];
    AppDelegate *delegate = [[UIApplication sharedApplication]delegate];
    [temporaryContext setParentContext:delegate.mainManagedObjectContext];

    for (NSDictionary* objd in objects) {
        tempObject = targetParser(objd, temporaryContext);
        [objectsArray addObject:tempObject];
    }

    mutableResult[@"objects"] = [objectsArray copy];
    
    return [mutableResult copy];
    return mutableResult;

const static id (^routesDeserializer)(NSDictionary*, NSManagedObjectContext*) = ^id (NSDictionary* d, NSManagedObjectContext* context) {

    Route* r = [Route newObjectWithContext:context];
    r.identifier = d[resourceIdKey];
    r.name = d[resourceNameKey];
    r.sequenceDescription = d[routeDescriptionKey];
    r.capacityType = d[routeCapacityTypeKey];
    r.objectHash = d[resourceHashKey];
    r.city = d[resourceCityIdKey];
    r.checkpoint = d[routeCheckpointIdsKey];

    return r;
};

What is the correct (or more elegant) way to do this?