iOS Core Data - grouping results

[ElysianEagle]

i've been looking all over but can't find any examples of how to group results when you fetch data using Core Data. can anyone point me to any resources?

by grouping i mean the same thing that you can do using the GROUP BY sql clause.

thanks!

 

[Saladinos]

You'd have to use a sort descriptor. To get it to group, override the compare: message to sort your array by a certain field.

 

[ElysianEagle]

hmm i did some more research and it looks like the way to go would be to use this method of NSFetchedResultsController:

- (id)initWithFetchRequestNSFetchRequest *)fetchRequest managedObjectContextNSManagedObjectContext *)context sectionNameKeyPathNSString *)sectionNameKeyPath cacheNameNSString *)name

and then set the sectionNameKeyPath argument appropriately to group objects.

havent tried it out yet but will try both approaches and let you know...thanks!