On Jan 3, 2013, at 8:49 AM, Fritz Anderson <fri...@manoverboard.org> wrote:
> iOS 6 > > I have (or will have) a Core Data store, one entity of which has an attribute > that is a French word. French collates differently than English or a naïve > Unicode sort would. My application will have both English and French > localizations. It is next-to-nonnegotiable that the word lists I present be > sorted in French order, regardless of the current locale. There will be > 74,000 instances; I'd like to have tables that narrow down by incremental > prefix searches. > > NSString has comparison methods that can take account of a specified locale, > so if I'm working in code, I don't (I hope) have a problem. > > But I'd like to get ordered results from Core Data fetches. My first > impression is that I could use the …comparator: versions of NSSortDescriptor, > and put my localized comparison in the block. But I know Core Data is often > pickier about what NSFetchRequest will do for you. The examples in the > documentation are confined to …Key:ascending: descriptors. > > I have three questions. > > 1. Are block-comparator sort descriptors permitted in NSFetchRequest? Not for SQL stores. Unsure about XML. Supported for in-memory. > > 2. If so, am I setting myself up for unacceptable performance? > > 3. If so, can you suggest another approach? In-memory scan? 74,000 items might not be all that many to fault in and sort. Alternatively, manually maintain an English and a French index when updating your data. Dunno of the best strategy here. the naive solution is to have a "french_index" and "english_index" column, but updating all the rows in your database just to handle a single insertion at the front of the list seems like a bad idea. But if your word list is static, that seems like the perfect approach. --Kyle Sluder _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
