Question

I’m having issues in getting Core Data info from 3 linked entities. Some of it works, while some doesn’t.

Model
Entity        Accounts                RegDate
relationship   heldby  >> to-many >>  inAccounts
attributes     balance                 addDate
               name

Entity        RegDate                 Regster
relationship  regheldBy >> to-many >> inRegDate
attributes    addDate                 amount

When I do this:

Regster *regster = [self.fetchedResultsController objectAtIndexPath:indexPath];
cell.textLabel.text = regster.amount;
NSLog(@"Regster: %@  %@", regster.amount, regster.inRegDate.addDate);

regster.amount displays the expected value, but regster.inRegDate.addDate null.

When I do this:

RegDate *regdate = [self.fetchedResultsController objectAtIndexPath:indexPath];
cell.textLabel.text = regdate.addDate;
NSLog(@"RegDate: %@", regdate.addDate);

regdate.addDate displays the expected value, whereas previous example I get null.
Additionally, I cannot get amount to display.
I thought I could use: regdate.regheldBy.amount > but this give error “Property ‘amount’ not found on object of type ‘NSSet'”

Not sure what I’m doing wrong… I’m guessing I might have the relationships setup improperly. I’ve tried many different things, but can’t get it to work.

Any ideas?

Answer 1

It might be caused by not setting inverse relationships for all your relationships.

Also because regdate.regheldBy is a to-many relationship, it is represented by a set containing Regster objects. You can’t call amount on the set, you first have to select a Regster object from your set.