MyDocument.m

#import "MyDocument.h"

@implementation MyDocument

- (id)init {
  [super init];
  employees = [[NSMutableArray alloc] init];
  return self;
}
- (void)dealloc {
  [employees release];
  [super dealloc];
}

#pragma mark Action methods

- (IBAction)deleteSelectedEmployees:(id)sender {
  // Which row is selected?
  NSIndexSet *rows = [tableView selectedRowIndexes];
  
  // Is the selection empty?
  if ([rows count] == 0) {
    NSBeep();
    return;
  }
  NSLog(@"-deleteSelectedEmployees: is deleting %@", rows);
  [employees removeObjectsAtIndexes:rows];
  [tableView reloadData];
}
- (IBAction)createEmployee:(id)sender {
  Person *newEmployee = [[Person alloc] init];
  NSLog(@"-createEmployee: is creating %@", newEmployee);
  [employees addObject:newEmployee];
  [newEmployee release];
  [tableView reloadData];
}

#pragma mark Table view dataSource methods

- (int)numberOfRowsInTableView:(NSTableView *)aTableView {
  return [employees count];
}

- (id)tableView:(NSTableView *)aTableView
objectValueForTableColumn:(NSTableColumn *)aTableColumn
            row:(int)rowIndex {
  // What is the identifier for the column?
  NSString *identifier = [aTableColumn identifier];
  
  // What person?
  Person *person = [employees objectAtIndex:rowIndex];
  
  // What is the value of the attribute named identifier?
  return [person valueForKey:identifier];
}

- (void)tableView:(NSTableView *)aTableView
   setObjectValue:(id)anObject
   forTableColumn:(NSTableColumn *)aTableColumn
              row:(int)rowIndex {
  NSString *identifier = [aTableColumn identifier];
  Person *person = [employees objectAtIndex:rowIndex];
  
  // Set the value for the attribute named identifier
  [person setValue:anObject forKey:identifier];
}

- (void)tableView:(NSTableView *)aTableView
sortDescriptorsDidChange:(NSArray *)oldDescriptors {
  NSArray *newDescriptors = [tableView sortDescriptors];
  NSLog(@"-tableView:sortDescriptorsDidChange:, newDescriptors == @%", newDescriptors);
  [employees sortUsingDescriptors:newDescriptors];
  [tableView reloadData];
}

#pragma mark Pre-generated

- (NSString *)windowNibName
{
    // Override returning the nib file name of the document
    // If you need to use a subclass of NSWindowController or if your document supports multiple NSWindowControllers, you should remove this method and override -makeWindowControllers instead.
    return @"MyDocument";
}

- (void)windowControllerDidLoadNib:(NSWindowController *) aController
{
    [super windowControllerDidLoadNib:aController];
    // Add any code here that needs to be executed once the windowController has loaded the document's window.
}

- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError
{
    // Insert code here to write your document to data of the specified type. If the given outError != NULL, ensure that you set *outError when returning nil.

    // You can also choose to override -fileWrapperOfType:error:, -writeToURL:ofType:error:, or -writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead.

    // For applications targeted for Panther or earlier systems, you should use the deprecated API -dataRepresentationOfType:. In this case you can also choose to override -fileWrapperRepresentationOfType: or -writeToFile:ofType: instead.

    if ( outError != NULL ) {
		*outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
	}
	return nil;
}

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError
{
    // Insert code here to read your document from the given data of the specified type.  If the given outError != NULL, ensure that you set *outError when returning NO.

    // You can also choose to override -readFromFileWrapper:ofType:error: or -readFromURL:ofType:error: instead. 
    
    // For applications targeted for Panther or earlier systems, you should use the deprecated API -loadDataRepresentation:ofType. In this case you can also choose to override -readFromFile:ofType: or -loadFileWrapperRepresentation:ofType: instead.
    
    if ( outError != NULL ) {
		*outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
	}
    return YES;
}

@end