CODEWITHSUNDEEP
core-data
user1563342
user1563342

Reputation: 21

Preloading data into core data

I am following a tutorial on preloading an existing database into core data. the code compiles fine until I get to this line: 

NSEntityDescription *entity = [NSEntityDescription    insertNewObjectForEntityForName:@"FailedBankInfo" inManagedObjectContext:context];

where it returns the following error: 2012-11-19 12:45:02.247 CoreDatTutorial2[2049:403] -[FailedBankInfo subentitiesByName]: unrecognized selector sent to instance 0x100301010'

I've checked to make sure the is not empty and that it has been saved into the the product directory. Any idea what I'm doing wrong? If I comment out that line of code, the project compiles without a problem.

here's the rest of the code:

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription insertNewObjectForEntityForName:@"FailedBankInfo" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    for (FailedBankInfo *info in fetchedObjects){
    {

Upvotes: 0

Views: 153

Answers (1)

Martin R
Martin R

Reputation: 539955

insertNewObjectForEntityForName:inManagedObjectContext:

creates a new managed object and inserts it into the managed object context. In particular, it returns an object of the class FailedBankInfo (in your case), and not a NSEntityDescription.

To create a NSEntityDescription, use entityForName:inManagedObjectContext::

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"FailedBankInfo"
                                inManagedObjectContext:context];
[fetchRequest setEntity:entity];

Note that (starting with iOS 5.0) you can simplify this to

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"FailedBankInfo"];

Upvotes: 2

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