Not able to handle executeFetchRequest error - ios

Question

My fetch request works fine and I get my fetched objects without any problems. What I want to do, is handle the error in case the entity doesn't exist. The problem is, I can't handle the error because the app crashes when I call executeFetechRequest: error: without any warnings.
My fetch looks like:
NSManagedObjectContext *context = [(AppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
request.entity = [NSEntityDescription entityForName:#"Info" inManagedObjectContext:context];
request.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:#"infoID" ascending:YES]];
[request setReturnsObjectsAsFaults:NO];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"infoID like %#",[a substringFromIndex:13]];
request.predicate = predicate;
request.fetchBatchSize = 1;
NSError *error = nil;
NSArray *results = [context executeFetchRequest:request error:&error];
if (error == nil) {
...
}
else {
//handle error
}
As I said, there's no problem as long as the entity exists, but I want to handle the error if it doesn't exist. Any idea? Cheers

Answer 1

You could ask the model if such entity is present:
NSArray *entities = managedObjectModel.entities;
BOOL canExecute=NO;
for(NSEntityDescription *ed in entities) {
// check if entity name is equal to the one you are looking for
if(found) {
canExecute=YES;
break;
}
}
if(canExecute) {
// execute your request and all the rest...
} else {
NSLog(#"Entity description not found");
}
if doesn't exist you don't execute the fetch reuest