On Feb 3, 2013, at 10:06 AM, Keary Suska <cocoa-...@esoteritech.com> wrote:
> On Feb 2, 2013, at 6:25 PM, Velocityboy wrote: > >> Finally got a chance to do some more debugging on this. >> >> I looked at the referenced object and figured out why the fault, at least. I >> had tried to bind the subcategory column's Content to >> category.subcategories, which resolved to a relationship on an >> NSManagedObject. Under the covers, evidently a relationship is represented >> as a set, but per the docs, the Content binding has to be to an array (the >> docs actually say it should be an NSArrayController.) > >> So evidently directly binding Content and Content Values to something >> hanging off a managed object, without going through a controller, is not a >> great idea. >> >> What I don't see is how to express what I want using an array controller, if >> that's what I have to do. I see two choices: >> >> - Bind the array controller for the popup's elements, somehow, to the >> 'subcategories' relationship for the category object that's selected in each >> row of the table >> - Bind the array controller for the popup's elements to the core data entity >> that represents all of the subcategories, and somehow specify to filter that >> data per row to just the elements that have a parent of the category that's >> selected in the row >> >> Is it possible to express either of these using just a binding? Or is this >> case complex enough that I should be looking at doing this part in code? > > I re-read your original post and I am not sure what you are actually after. > If what you want is, in a table, to display the category and in the same row > display a popup of subcategories, you may not be able to accomplish the > latter with bindings, but I forget exactly why. You can try binding the > column value to controller.arrangedObjects.relationship but I don't know if > NSTableView is smart enough to handle it. If it can't (and I suspect that it > won't), then you will need to instead handle the popup column manually with > NSTableView delegate calls. Yes, that's exactly what I'm after. Thanks, I'll do it the way you're suggesting. > >> On Jan 30, 2013, at 11:23 PM, Quincey Morris wrote: >> >>> On Jan 30, 2013, at 22:41 , Velocityboy <velocity...@rodentia.net> wrote: >>> >>>> I see two bizarre behaviors: when I change the Category value with the >>>> popup button cell in one row, Category values in other rows change. When I >>>> change the subcategory, I get an exception: >>>> >>>> 2013-01-30 22:32:23.192 Testapp[10506:f03] -[_NSFaultingMutableSet >>>> objectAtIndex:]: unrecognized selector sent to instance 0x101d5dfd0 >>> >>> A NSArray selector is being sent to a NSSet object. That suggests you've >>> forgotten to set the NSArrayController into "entity" mode, which is >>> necessary for a Core Data property, which is modeled as a set rather than >>> an array. >>> >>> In "class" mode, the array controller expects its content to be an array; >>> in "entity" mode, it expects the content to be a set. > > > Keary Suska > Esoteritech, Inc. > "Demystifying technology for your home or business" > > _______________________________________________ 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
