FETCH REQUEST

fetch_request

/*
  To call:

  myArray = [self fetchDataWithEntityName:@"Employees"  withSortDescriptorKey:@"name"  withPredicateFormat:[NSPredicate predicateWithFormat:@"employee == %@", myEmployeeName];

*/
- (NSArray *)fetchDataWithEntityName:(NSString *)entityName  withSortDescriptorKey:(NSString *) sortDescriptorKey withPredicateFormat:(NSPredicate *)predicateFormat{
    
    NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:context];
    
    NSFetchRequest *request = [[NSFetchRequest alloc]init];
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]
                                        initWithKey:sortDescriptorKey
                                        ascending:YES];
    
    NSArray *descriptor = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
    
    [request setSortDescriptors:descriptor];
    [request setEntity:entity];
    [request setPredicate:predicateFormat];
    
    NSError *error;
        
    NSArray *resultArray = [context executeFetchRequest:request error:&error];
        
    if(error){
        return nil;
    } else {
        return resultArray;
    }
    
}