iOS app requires deleting to fetch data - ios

Question

i'm looking for some information regarding this problem.
I have an iOS project which fetches data from a remote server using REST-Kit. If I open the iOS simulator, delete the app, and then build and run, the tableview appears as expected. Left Image
However if I then rebuild and run without deleting the app within the simulator first, there are no thrown errors, but the cells in the tableview are empty. Right Image
Has anybody had this issue before? How do I get the data to appear correctly without first deleting the app! Thanks for reading!
Code from app delegate to initialise core data and define mappings between JSON and core data.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
NSLog(#"App started");
// Initialise RestKit
NSURL *baseURL = [NSURL URLWithString:#"http://*.*.*.*/"];
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];
// Initialize managed object model from bundle
NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
// Initialize managed object store
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
NSError *error = nil;
BOOL success = RKEnsureDirectoryExistsAtPath(RKApplicationDataDirectory(), &error);
if(! success){
RKLogError(#"Failed to create application directory at path '%#': %#", RKApplicationDataDirectory(), error);
}
[objectManager setAcceptHeaderWithMIMEType:RKMIMETypeJSON];
// Complete core data store initialization
[managedObjectStore createPersistentStoreCoordinator];
NSString *storePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:#"EventsDB.sqlite"];
NSString *seedPath = [[NSBundle mainBundle] pathForResource:#"RKSeedDatabase" ofType:#"sqlite"];
NSPersistentStore *persistantStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath fromSeedDatabaseAtPath:seedPath withConfiguration:nil options:nil error:&error];
NSAssert(persistantStore, #"Failed to add persistent with error %#", error);
objectManager.managedObjectStore = managedObjectStore;
// Create the managed object contexts
[managedObjectStore createManagedObjectContexts];
// Configure a managed object cache to ensure we don't create duplicate objects
managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.persistentStoreManagedObjectContext];
// If a data request fails we should send an NSError message
RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class]];
[errorMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:#"errorMessage"]];
RKResponseDescriptor *errorDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:errorMapping pathPattern:nil keyPath:#"error" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError)];
[objectManager addResponseDescriptorsFromArray:#[errorDescriptor]];
// Map event
RKEntityMapping *eventMapping = [RKEntityMapping mappingForEntityForName:#"Event" inManagedObjectStore:managedObjectStore];
eventMapping.identificationAttributes = #[#"eventId"];
[eventMapping addAttributeMappingsFromDictionary:#{//#"JSON":#"MODEL"
#"_id":#"eventId",
#"name":#"name",
#"venue":#"venue",
#"drink_prices":#"prices",
#"popularity":#"popularity",
#"genre":#"genre",
#"promotionQuote":#"promotionQuote",
#"dress_code":#"dressCode",
#"opening_time":#"openingTime",
#"closing_time":#"closingTime",
#"critic_review":#"criticReview",
#"critic_rating":#"criticRating",
#"image":#"imageURL",
#"published":#"published"
}];
// Map drink deals
RKEntityMapping *dealMapping = [RKEntityMapping mappingForEntityForName:#"Deal" inManagedObjectStore:managedObjectStore];
dealMapping.identificationAttributes = #[#"dealId"];
[dealMapping addAttributeMappingsFromDictionary:#{ //#"JSON":#"MODEL"
#"_id":#"dealId",
#"description":#"dealDescription",
#"price":#"price"
}];
// Map entries
RKEntityMapping *entryMapping = [RKEntityMapping mappingForEntityForName:#"Entry" inManagedObjectStore:managedObjectStore];
entryMapping.identificationAttributes = #[#"entryId"];
[entryMapping addAttributeMappingsFromDictionary:#{ //#"JSON":#"MODEL"
#"_id":#"entryId",
#"type":#"type",
#"price":#"price"
}];
// Map guestliest -- reviews, city and university come off a guestlisted user
RKEntityMapping *guestlistMapping = [RKEntityMapping mappingForEntityForName:#"User" inManagedObjectStore:managedObjectStore];
guestlistMapping.identificationAttributes = #[#"userId"];
[guestlistMapping addAttributeMappingsFromDictionary:#{//#"JSON":#"MODEL"
#"_id":#"userId",
#"name":#"name",
}];
// Map vip extras
RKEntityMapping *vipMapping = [RKEntityMapping mappingForEntityForName:#"VIP" inManagedObjectStore:managedObjectStore];
vipMapping.identificationAttributes = #[#"vipId"];
[vipMapping addAttributeMappingsFromDictionary:#{ //#"JSON":#"MODEL"
#"_id":#"vipId",
#"type":#"type",
#"available":#"available"
}];
// EventList Mapping
RKEntityMapping *eventListMapping = [RKEntityMapping mappingForEntityForName:#"EventList" inManagedObjectStore:managedObjectStore];
// Register relationships
[eventListMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"events" toKeyPath:#"events" withMapping:eventMapping]];
[eventMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"drink_deals" toKeyPath:#"deals" withMapping:dealMapping]];
[eventMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"entry" toKeyPath:#"entries" withMapping:entryMapping]];
[eventMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"guestlist" toKeyPath:#"guestlist" withMapping:guestlistMapping]];
[eventMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"vipExtras" toKeyPath:#"vipExtras" withMapping:vipMapping]];
// Regiseter event mapping with the provider. Do i have to do this for all 4 event maps?
RKResponseDescriptor *eventListResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:eventListMapping
method:RKRequestMethodGET
pathPattern:#"api/event.json"
keyPath:nil
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:eventListResponseDescriptor];
NSLog(#"objMan responseDescriptors->%#", objectManager.responseDescriptors);
// enable activity indicator spinner
[AFNetworkActivityIndicatorManager sharedManager].enabled = YES;
// Map
return YES;
}
Code to fetch data
-(void)requestData {
NSLog(#"requesting data");
NSString *requestPath = #"api/event.json";
[[RKObjectManager sharedManager]
getObjectsAtPath:requestPath
parameters:nil
success: ^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
// events have been saved in core data by now
NSLog(#"Success");
[self fetchEventsFromContext];
}
failure: ^(RKObjectRequestOperation *operation, NSError *error){
RKLogError(#"Load failed with error: %#", error);
NSLog(#"Fail");
}
];
}
-(void)fetchEventsFromContext {
NSManagedObjectContext *context = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:#"EventList"];
if(!context) exit(-1);
if(!fetchRequest) exit(-1);
//NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:#"popularity" ascending:YES];
fetchRequest.sortDescriptors = nil;//#[descriptor];
NSError *error = nil;
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
EventList *eventList = [fetchedObjects firstObject];
self.events = [eventList.events allObjects];
if(!self.events){NSLog(#"No events");}
[self.tableView reloadData];
NSLog(#"reloading data");
}
**Code to render table cells **
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"rendering cells");
MasterTableCellTableViewCell *cell = (MasterTableCellTableViewCell *)[tableView dequeueReusableHeaderFooterViewWithIdentifier:#"MasterTableCell" ];
if(!cell)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"MasterTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
NSLog(#"Got here");
NSLog(#"self.events[indexPath.row]->%#", self.events[indexPath.row]);
tableView.rowHeight = 160;
Event *event = self.events[indexPath.row];
NSString *imageURL = event.imageURL;
[cell.backgroundImageView sd_setImageWithURL:[NSURL URLWithString:imageURL]];
cell.eventLocationLabel.text = event.venue;
cell.eventNameLabel.text = event.name;
cell.criticRatingLabel.text = #"Critic Rating";
// cell.criticRatingValue. = event.criticRating; // How to display a number?
cell.userRatingLabel.text = #"User Rating";
cell.userRatingValue.text = #"X";
NSLog(#"Finished assigning cell deets");
return cell;
}