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Supercharged Cocoa development with ObjectiveSugar & ObjectiveRecord Saturday, September 21, 13

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@mneorr mneorr.com Saturday, September 21, 13

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Rijeka (Fiume) Saturday, September 21, 13

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PROGRAMMERS Saturday, September 21, 13

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PROGRAMMERS Cat people Saturday, September 21, 13

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PROGRAMMERS Cat people Dog people Saturday, September 21, 13

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That’s why I have a hybrid Saturday, September 21, 13

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Đuro Saturday, September 21, 13

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Saturday, September 21, 13

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OSS Saturday, September 21, 13

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Saturday, September 21, 13

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Kiwi Saturday, September 21, 13

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Kiwi Saturday, September 21, 13

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Alcatraz Saturday, September 21, 13

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Saturday, September 21, 13

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The point Saturday, September 21, 13

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shorter != better Saturday, September 21, 13

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BUT many times, shorter can be better Saturday, September 21, 13

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• Focusing on DOING a task, rather than HOW the task is being done • Going too much into implementation can distract you from understanding the context Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectContext]; NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Employee" inManagedObjectContext:moc]; NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFormat: @"(lastName LIKE[c] 'Worsley') AND (salary > %@)", minimumSalary]; [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"firstName" ascending:YES]; [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request error:&error]; if (array == nil) { // Deal with error... } } Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Referencing a context Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Referencing a context NSEntityDescription? Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Referencing a context NSEntityDescription? A fetch request! Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Referencing a context NSEntityDescription? A fetch request! A predicate Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Referencing a context NSEntityDescription? A fetch request! A predicate ..and a sort descriptor Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Referencing a context NSEntityDescription? A fetch request! A predicate ..and a sort descriptor Error handling Saturday, September 21, 13

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- (void)fetchEmployees { NSManagedObjectContext *moc = [self managedObjectConte NSEntityDescription *entityDescription = [NSEntityDesc entityForNam NSFetchRequest *request = [[NSFetchRequest alloc] init [request setEntity:entityDescription]; // Set example predicate and sort orderings... NSNumber *minimumSalary = @150000.00; NSPredicate *predicate = [NSPredicate predicateWithFor @"(lastName LIKE[c] 'Worsley [request setPredicate:predicate]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor initWithKey:@"firs [request setSortDescriptors:@[sortDescriptor]]; NSError *error = nil; NSArray *array = [moc executeFetchRequest:request erro if (array == nil) { // Deal with error... } } Referencing a context NSEntityDescription? A fetch request! A predicate ..and a sort descriptor Error handling Fetching Saturday, September 21, 13

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Defaults out of the box tweaking when you need it Saturday, September 21, 13

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NSArray *employees = [Employee all]; Saturday, September 21, 13

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NSArray *employees = [Employee where:@{ @"lastName": @"Worsley" }]; Saturday, September 21, 13

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ObjectiveC @[] @{} @# Saturday, September 21, 13

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ObjectiveSugar Saturday, September 21, 13

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5.times { puts "hello!" } Saturday, September 21, 13

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5.times { puts "hello!" } for (int i = 0; i < 5; i++ ) { NSLog(@"Hello"); } Saturday, September 21, 13

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[@5 times:^{ NSLog(@"Hello!"); }]; Saturday, September 21, 13

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[@5 times:^{ NSLog(@"Hello!"); }]; [@1 upto:5 do:^(int number) { NSLog(@"The number is: %d", number); }]; Saturday, September 21, 13

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[cars enumerateObjectsUsingBlock:^(id car, NSUInteger index, BOOL *stop) { NSLog(@"Car: %@", car.name); }]; Saturday, September 21, 13

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[cars enumerateObjectsUsingBlock:^(id car, NSUInteger index, BOOL *stop) { NSLog(@"Car: %@", car.name); }]; [cars each:^(id car) { NSLog(@"Car: %@", car.name); }]; Saturday, September 21, 13

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NSDictionary *dict = @{ @"one" : @1, @"two" : @2, @"three" : @3 }; [dict each:^(id key, id value) { NSLog(@"Key: %@, Value: %@", key, value); }]; // Key: one, Value: 1 // Key: two, Value: 2 // Key: three, Value: 3 Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { ! NSMutableArray *people = [NSMutableArray new]; } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { ! NSMutableArray *people = [NSMutableArray new]; ! for (NSDictionary *personDict in peopleInDicts) { ! } } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { ! NSMutableArray *people = [NSMutableArray new]; ! for (NSDictionary *personDict in peopleInDicts) { ! ! Person *person = [[Person alloc] initWithDictionary:personDict]; ! ! [people addObject:person]; ! } } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { ! NSMutableArray *people = [NSMutableArray new]; ! for (NSDictionary *personDict in peopleInDicts) { ! ! Person *person = [[Person alloc] initWithDictionary:personDict]; ! ! [people addObject:person]; ! } ! return [NSArray arrayWithArray:people]; } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { NSArray *people = [peopleInDicts map:^id(NSDictionary *personDict) { }]; return people; } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { NSArray *people = [peopleInDicts map:^id(NSDictionary *personDict) { ! ! return [[Person alloc] initWithDictionary:personDict]; }]; return people; } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { NSArray *people = [peopleInDicts map:^id(NSDictionary *personDict) { ! ! return [[Person alloc] initWithDictionary:personDict]; }]; return people; } @{}, @{}, @{},... Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { NSArray *people = [peopleInDicts map:^id(NSDictionary *personDict) { ! ! return [[Person alloc] initWithDictionary:personDict]; }]; return people; } @{}, @{}, @{},... , , ... Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { NSArray *people = [peopleInDicts map:^id(NSDictionary *personDict) { ! ! return [[Person alloc] initWithDictionary:personDict]; }]; return people; } Saturday, September 21, 13

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- (NSArray *)createPeopleFromDictionaries:(NSArray *)peopleInDicts { return [peopleInDicts map:^id(NSDictionary *personDict) { ! ! return [[Person alloc] initWithDictionary:personDict]; }]; } Saturday, September 21, 13

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NSArray - lastObject Saturday, September 21, 13

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NSArray - lastObject - firstObject ? Saturday, September 21, 13

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Strings Saturday, September 21, 13

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[NSString stringWithFormat:@"Hello %@", @"world"]; Saturday, September 21, 13

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[NSString stringWithFormat:@"Hello %@", @"world"]; @(@"Hello", @"world") Saturday, September 21, 13

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[NSString stringWithFormat:@"Hello %@", @"world"]; @(@"Hello", @"world") NSStringWithFormat(@"Hello %@", @"world"); Saturday, September 21, 13

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NSString *sentence = @"This is a text-with-numbers 1234"; Saturday, September 21, 13

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NSString *sentence = @"This is a text-with-numbers 1234"; [sentence containsString:@"this is a"]; // YES Saturday, September 21, 13

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NSString *sentence = @"This is a text-with-numbers 1234"; [sentence containsString:@"this is a"]; // YES NSRange range = [self rangeOfString:string options:NSCaseInsensitiveSearch]; return range.location != NSNotFound; Saturday, September 21, 13

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unless Saturday, September 21, 13

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unless(1 + 1 == 3) { NSLog(@"Math rocks!"); } Saturday, September 21, 13

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unless(1 + 1 == 3) { NSLog(@"Math rocks!"); } unless(_restaurants) { _restaurants = [self fetchRestaurants]; } Saturday, September 21, 13

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NSDate Saturday, September 21, 13

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“NSDate API rocks!” Saturday, September 21, 13

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“NSDate API rocks!” - nobody ever Saturday, September 21, 13

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int secondsInMinute = 60; int minutesInHour = 60; int hoursInDay = 24; int days = 98 * hoursInDay * minutesInHour * secondsInMinute; NSDate *christmas = [NSDate dateWithTimeInterval:days sinceDate:[NSDate date]]; // 2013-12-25 00:00:00 +0000 Saturday, September 21, 13

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int secondsInMinute = 60; int minutesInHour = 60; int hoursInDay = 24; int days = 98 * hoursInDay * minutesInHour * secondsInMinute; NSDate *christmas = [NSDate dateWithTimeInterval:days sinceDate:[NSDate date]]; NSDate *christmas = @(98).days.fromNow; // 2013-12-25 00:00:00 +0000 // 2013-12-25 00:00:00 +0000 Saturday, September 21, 13

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int secondsInMinute = 60; int minutesInHour = 60; int hoursInDay = 24; int days = 98 * hoursInDay * minutesInHour * secondsInMinute; NSDate *christmas = [NSDate dateWithTimeInterval:days sinceDate:[NSDate date]]; NSDate *future = @(24).days.fromNow; // 2013-12-25 00:00:00 +0000 // 2013-12-25 00:00:00 +0000 NSDate *reminder = [@(1).month until:newYearsDay]; Saturday, September 21, 13

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CoreData Saturday, September 21, 13

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CoreData 3 talks so far Saturday, September 21, 13

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ObjectiveRecord Saturday, September 21, 13

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// store Person *person = [Person create]; person.firstName = @"Tom"; person.lastName = @"Cat"; [person save]; [person delete]; // fetch NSArray *people = [Person all]; Saturday, September 21, 13

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AppDelegate Saturday, September 21, 13

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AppDelegate 160 loc Saturday, September 21, 13

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CoreData • creating • fetching • modifying • saving / deleting Saturday, September 21, 13

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Creating Saturday, September 21, 13

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Saturday, September 21, 13

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- (void)insertNewObject:(id)sender { NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext]; NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity]; NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context]; // If appropriate, configure the new managed object. // Normally you should use accessor methods, but using KVC here avoids the need to add a custom class to the template. [newManagedObject setValue:[NSDate date] forKey:@"timeStamp"]; // Save the context. NSError *error = nil; if (![context save:&error]) { // Replace this implementation with code to handle the error appropriately. // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } } Saturday, September 21, 13

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NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext]; Event *event = [Event create:@{ @"timeStamp": [NSDate date] } inContext:context]; [event save]; Saturday, September 21, 13

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Fetching Saturday, September 21, 13

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• Create an instance of NSPredicate • Create an instance of NSFetchRequest, but you need to talk with NSEntityDescription as well • Fetch and check for errors Saturday, September 21, 13

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[Person all]; Saturday, September 21, 13

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[Person all]; [Person where:@"name == 'John'"]; Saturday, September 21, 13

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[Person all]; [Person where:@"name == 'John'"]; [Person where:@{ @"name": @"John", @"isMember": @YES }]; Saturday, September 21, 13

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[Person all]; [Person where:@"name == 'John'"]; [Person where:@{ @"name": @"John", @"isMember": @YES }]; [Person where:@"name == 'John'" inContext:context]; Saturday, September 21, 13

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BYOMOC™ Saturday, September 21, 13

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Testing Saturday, September 21, 13

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Domain Logic Persistence Saturday, September 21, 13

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[[CoreDataManager sharedManager] useInMemoryStore] TestHelper.m Saturday, September 21, 13

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Mapping Saturday, September 21, 13

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@interface Person : NSManagedObject @property(strong, nonatomic) NSString *firstName; @property(strong, nonatomic) NSString *lastName; @property(strong, nonatomic) NSNumber *age; @end Saturday, September 21, 13

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{ "people": [ { "first_name": "John", "last_name": "Doe", "age": 24 }, { "first_name": "Mark", "last_name": "Smith", "age": null }! ] } @interface Person : NSManagedObject @property(strong, nonatomic) NSString *firstName; @property(strong, nonatomic) NSString *lastName; @property(strong, nonatomic) NSNumber *age; @end Saturday, September 21, 13

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CoreData 3 NSNull Saturday, September 21, 13

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• - you need NO AppDelegate code to start, and you can still save context on `-applicationWillTerminate:` • - all the important ObjectiveRecord methods have a counterpart with `NSManagedObjectContext` parameter • - ObjectiveRecord supports writing your own NSPredicates as well • - unlike MagicalRecord, does not create NSManagedObjectContexts for you • - unlike MagicalRecord, it doesn't use mr_prefixes. (you can go beat me later about that) • - it's lightweight Saturday, September 21, 13

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Thanks Saturday, September 21, 13