You named the method -addInvoiceLineObject:, but the property is -invoiceLines? That's not going to work.
Also, NSController is sadly not KVO-compliant for dependent keys, meaning that you can't override +keyPathsForValuesAffectingValueForKey: and return a key path that goes through an NSController. --Kyle Sluder On 9/27/09, Eric Morand <eric.mor...@me.com> wrote: > Hi guys, > > I'm trying to implement a rather simple functionality in my app. > > I have a Core Data entity class that represents invoices (Invoice). > This class has a to-many relationship with another Core Data entity > class that represents invoice lines (InvoiceLine). My Invoice class > also has a property named "totalAmount" and my InvoiceLine class has a > property named "lineAmount". I want the total amount of the invoice > to be re-computed when any of the invoice lines amount changes. > > Searching this list, I found that I need to add the invoice instance > as an observer to the lineAmount property of any invoice line added > with the "addInvoiceLineObject:" method. It works. > But only when I explicitly use this method. When the invoice line is > added using an array controller, the method is not called at all !!! > > For example, I have an array controller named "invoicesController" > that lists all the invoices of the database. Then I have an array > controller named "invoiceLinesController" whose content is bound to > "invoicesController.selection.invoiceLines". It works : > invoiceLinesController actually contains the invoice inlines of the > selected invoice in invoicesController. > > Now, when I add a saleLine using the following command... > > InvoiceLine * myNewInvoiceLine = [NSEntityDescription > insertNewObjectForEntityForName:@"InvoiceLine" > inManagedObjectContext:managedObjectContext]; > [invoiceLinesController addObject:myNewInvoiceLine]; > > ...the "addInvoiceLineObject:" method of the selected invoice is not > called, even if the invoice line is actually added to the invoiceLines > mutable set of the invoice ! > > How am I supposed to add the invoice as an observer of the added > invoice line (myNewInvoiceLine) properties ? > Wy is the addInvoiceLineobject: method not called ? Is the array > controller inserting the invoice line using primitive methods ? Is > this the normal behavior ? > > > Thanks for your help, > > > Eric Morand. > _______________________________________________ > > 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: > http://lists.apple.com/mailman/options/cocoa-dev/kyle.sluder%40gmail.com > > This email sent to kyle.slu...@gmail.com > -- --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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
