NSPredicate to return ANY on self

Question

Is there a method (NSPredicate or other function) that returns ANY single existing NSManagedObject. Could also be the count of an entity type. No further requirements other than mere existence on self.

NSPredicate *fetch = [NSPredicate predicateWithFormat: "@ANY"]

....
[fetch setEntity:entityDescription];
[fetch setPredicate: predicate];
[fetch setFetchLimit:1];

Note that this is the 'root' object, thus no instance at this boot stage.

Answer 1

I am not sure if I understand your question correctly, but to get a one (arbitrary) object of your entity just don't add a predicate to the fetch request and set the fetch limit to one:

NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"YourEntity"];
[request setFetchLimit:1];

NSError *error;
NSArray *result = [context executeFetchRequest:request error:&error];
if (result == nil) {
    // Error executing fetch request
} else if ([result count] == 0) {
    // Found none
} else {
    // Found one
    NSManagedObject *obj = result[0];
}