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. > 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
