Why is my Realm object not saving stored values?

Question

I was browsing around looking for a solution to implement a small offline data storage in one of my apps which would be easy and quick to use. Anyways, I came across with Realm

Answer 1

The problem with your realm object is that you are not querying realm for your object. Rather, you are only allocating a new iReciptDataBase object. You will first need to add a property to that object so that you will be able to query for it, something like databaseId shown here:

@interface iReceiptDatabase : RLMObject
@property NSString *receiptNo;
@property NSString *databaseId;
@end

@implementation iReceiptDatabase
@end

RLM_ARRAY_TYPE(iReceiptDatabase)

Then in your viewDidLoad, you first query the realm file for an existing object, then only after not finding it, you would allocate it:

- (void)viewDidLoad {
    [super viewDidLoad];

    RLMRealm *realm = [RLMRealm defaultRealm];
    iReceiptDatabase *myDatabase = [[iReceiptDatabase objectsWhere:@"databaseId = '1'"] firstObject];

    if(!myDatabase) {
        [realm beginWriteTransaction];
        myDatabase = [[iReceiptDatabase alloc] init];
        myDatabase.receiptNo = @"1";
        myDatabase.databaseId = @"1";
        [realm addObject:myDatabase];
        [realm commitWriteTransaction];
    }

    //...
}