I have a series of questions about using CoreData (iPad). Although CoreData is supposedly easy to use, I have found it anything but. It is extremely finicky and unforgiving. In fact, even with DTS support, I have never been able to get NSFetchedResultsController to work using a cache. I do have code working in a project retrofit, which I understand is probably the worst way to start using CoreData.
My main entity has three references (one-to-one and one-to-many) to identical entities defined as class "File" (a managed object). File is not defined in the graphical model and is the only class (for the referenced entities) defined in the code. File has a back reference, and two attributes, a user-assigned name and a code-assigned uniqueID integer, the latter of which forms the main part of the actual (internal) file name when file access is required. Actual files are stored in their respective subfolders of the documents folder for each defined File entity. Question 1: The FRC is for the main entity and sorts on the main entity's own name attribute. Is there anything is what I described above which could be interfering with using an FRC cache? Question 2: In the File class, what should I override to delete the actual associated file when a file object is deleted from the database? (I'm currently doing that separately when deleting the managed object.) Does NSManagedObject's "dealloc" get called? Question 3: The main entity has several NSNumbers. Should I write translators for each of these to make life easier? (Why wasn't this built into CoreData in the first place?) Question 4: Is there any reason why you can't add additional methods (not ivars) to Managed object code-files? Question 5: I'm currently formulating file URLs in a separate FileManager object. Is there a better way for CoreData to manage file references? Full URLs could be problematic, if later systems change anything. Maybe partial URLs/paths relative to the application's documents folder? Comment: I have yet to see any sample code or writeups on using CoreData to manage files, which seems like something that should be in common usage. _______________________________________________ Cocoa-dev mailing list ([email protected]) 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
