Hi folks
Well, I have found a very simple way to avoid secondary MOCs or new objects
appearing in the table view, whilst adding new objects.
My example is to use a modal sheet to allow the editing of a new object.
In the NIB for the modal sheet, add a NSObjectController, set it to Class mode,
leave the Class Name at NSMutableDictionary and check Prepares Content.
In the controller class, add the following method to respond to the "+" button
being pressed on the main form:
- (IBAction) create:(id)sender
{
if (panel == nil)
{
NSBundle *bundle = [NSBundle bundleForClass:[self class]];
NSNib *nib = [[[NSNib alloc] initWithNibNamed:@"NewWordSheet"
bundle:bundle] autorelease];
BOOL success = [nib instantiateNibWithOwner:self topLevelObjects:nil];
if (!success)
{
// should present error
return;
}
}
else
{
[self.panel makeFirstResponder:self.panel];
[self.wordController setContent:[NSMutableDictionary dictionary]];
}
[NSApp beginSheet:self.panel
modalForWindow:self.parentWindow
modalDelegate:self
didEndSelector:@selector(sheetDidEnd:returnCode:contextInfo:)
contextInfo:NULL];
}
Then, add the sheet closure delegate:
- (void) sheetDidEnd:(NSWindow *)sheet returnCode:(int)returnCode
contextInfo:(void *)contextInfo
{
// we are only interested in doing something with the edited word
// if the Save button was pressed
if (returnCode == NSOKButton)
{
[[self.managedObjectContext undoManager] beginUndoGrouping];
@try
{
[[self.managedObjectContext undoManager] setActionName:@"Add Word"];
Word *newWord = [NSEntityDescription
insertNewObjectForEntityForName:@"Word"
inManagedObjectContext:self.managedObjectContext];
NSDictionary *editedValues = [wordController content];
for (NSString *key in editedValues)
{
id value = [editedValues valueForKey:key];
[newWord setValue:value forKey:key];
}
NSError *error;
if (![self.managedObjectContext save:&error])
{
NSLog(@"Could not save new Word");
}
}
@finally
{
[[self.managedObjectContext undoManager] endUndoGrouping];
}
[sourceListController fetch:nil];
}
// close the dialog
[sheet orderOut:self];
// clear temporary object from controller
[wordController setContent:nil];
}
Of course, this doesn't account for 1..N relationships, but it certainly works
with N..1.
Joanna
--
Joanna Carter
Carter Consulting
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