Home/ Questions/Q 6014059
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-23T02:38:14+00:00

I’ve got a problem with UITableViews and many-to-many relationships. I have two classes, A

  • 0

I’ve got a problem with UITableViews and many-to-many relationships.

I have two classes, A and B, that both extend NSManagedObject and live in Core Data. Each has a to-many relationship to the other:

A<<–>>B

I would like to use objects of class A as the sections of a UITableView, and it’s set of B objects as “data rows” in the TableView. Is this possible, and what would be the best approach to achieve this? Preferably I would like to use a NSFetchedResultsController to manage the data presented by the UITableView, but so far I have not been able to come up with a predicate and section name key path that works.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I would use NSFetchedResultsController to watch over the A objects. Use your fetched results to populate the section titles. Then when you are looking to populate your “data rows”, you can find your current A object (by using [[fetchedResultsController fetchedResults] objectAtIndex:indexPath.section] or something similar) and extract the B objects from it with A.BOjbects, which returns the NSSet of all B objects associated with the A object. After doing that, you can filter or sort the list as you please before placing them in the rows

    • 0