Question

I have two entities: Item and Note.

assign the relationship when I save

Item *item = [NSEntityDescription insertNewObjectForEntityForName:@"Item"
                                               inManagedObjectContext:self.managedObjectContext];
Note *note = [NSEntityDescription insertNewObjectForEntityForName:@"Note"
                                               inManagedObjectContext:self.managedObjectContext];

note.noteText = @"test";

[note setInItem:item]; //set relationship??
[self.managedObjectContext save:nil];  // write to database

When I load the data, Item attributes are loaded, but I do not know how to load the note.noteText for this item.

self.itemNameTextField.text = self.item.name;
...
...
self.itemNoteTextField.text = ????????????

Thanks!

Answer 1

If item is an Item object then item.containNote is the set of all related Note objects. You can iterate over the notes with

for (Note *note in item.containNote) {
    NSString *text = note.Text;
    // Now you can create a text field for this note and display the text ... 
}