Question

When i am using the NSPredicate while fetch the unique user data from Coredata Entity the app getting crash. But, no error logs. This is the code am using,

if (managedObjectContext == nil) 
{ 
    managedObjectContext = [(AppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; 
}


NSPredicate *predicate = [NSPredicate predicateWithFormat:@"Name==%@",selectedUserName];  
NSFetchRequest *fectchreq = [[NSFetchRequest alloc] init];
NSEntityDescription *entitydes = [NSEntityDescription entityForName:@"ALLData" inManagedObjectContext:managedObjectContext];
[fectchreq setEntity:entitydes];
[fectchreq setPredicate:predicate];

NSSortDescriptor *sortdes = [[NSSortDescriptor alloc] initWithKey:@"Name" ascending:YES];
NSArray *sortdesarray = [[NSArray alloc] initWithObjects:sortdes, nil];
[fectchreq setSortDescriptors:sortdesarray];
[sortdes release];
[sortdesarray release];   
NSError *error = nil; 
//NSMutableArray *storeddata = [[[managedObjectContext executeFetchRequest:fectchreq] error:&error] mutableCopy];
NSArray *storeddata = [managedObjectContext executeFetchRequest:fectchreq error:&error];
//[fectchreq release];
NSLog(@"StoreData : %@, count : %d",storeddata, [storeddata count]);

Can anyone please help to solve this problem? THanks in advance.

Answer 1

NSError *error; 
NSMutableArray *storeddata = [managedObjectContext executeFetchRequest:fectchreq error:error];

You need to change this code to:

NSError *error = nil;
NSArray *storeddata = [managedObjectContext executeFetchRequest:fectchreq error:&error];

Reasons:
The error argument should be passed as a pointer because the declaration is -executeFetchRequest:(NSFetchedRequest *)request error:(NSError **)error;
Also this method returns NSArray, not NSMutableArray – you must be getting compiler warning about this…