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Cannot Perform Operation Without A Managed Object Context

EDIT: I am using regular xib file. I was still getting Cannot perform operation without a managed object context once each time a new document was opened or created. Is there something > NSDocument does to support Core Data that an NSPrefsPane wouldn't do > by default? > > Basically, when I click my "add" button, although it's wired to Objective-C version upon request: @interface MyViewController () @property (nonatomic, readonly) NSMangedObjectContext* managedObjectContext; @end @implementation MyViewController - (NSManagedObjectContext*)managedObjectContext { return ((AppDelegate*)([NSApplication sharedApplication].delegate)).managedObjectContext; } ... @end share|improve this answer edited Aug 25 '15 weblink

In order to have a selection in one tab affect what is shown in another tab you will need to add something, likely in whatever shared super view or window controller Also is the program document based or not? Thanks, Haris Charilaos Skiadas Re: Cannot perform operation without a managed object context Jul 09 2005, 22:34 Replying to my own post since I just found out what was wrong. Thanks @Eraserhead! Get More Info

I don't want multiple docs... The sample I was shown used this method and had no error messages at all, it was however a single view controller inside the window controller with one array controller. All entered Commands are shown in all cases, I have tried filters predicates, fetch predicates, etc, with varying degrees of disaster.

All the bindings will be done for you, and you can inspect them if you wish to learn from them. var mainContext:NSManagedObjectContext! There's also always been a MOC object for nibs, at least. override func awakeFromNib() { coreStack = AP_CoreDataStack(){ (result) -> () in if result { self.mainContext = self.coreStack.mainContext } } } Setup of Core Data Stack // MARK: - AP_CoreDataStack Class class

What do you call a device that tells a live audience what to do? Are there continuous functions for which the epsilon-delta property doesn't hold? Or in an other punctuation: return [(AppDelegate *)[[NSApplication sharedApplication] delegate] managedObjectContext]; –Ron Wood Aug 27 '15 at 12:07 add a comment| up vote 1 down vote You have always been able http://stackoverflow.com/questions/36997265/using-arraycontroller-results-in-cannot-perform-operation-without-a-managed-obj The issue I believe is that when I set the view controllers managedObjectContext property to that of the [[NSApp delegate] managedObjectContext] in awakeFromNib it doesn't perform the binding even thought the

Also is the program document based or not?Click to expand... newsgator Bloglines iNezha Tweet! I created an Entity data model, and then tried to add an NSTable and some buttons and wire them up the same way I'd seen the Core Data Entity tool do share Share on Twitter Share on Facebook Email Link Like + Quote Reply simplebeep, Dec 21, 2009 simplebeep macrumors member Joined: Sep 28, 2007 Location: SLC #6 Eraserhead said: ↑ …you

Let me know how it turns out. Well, you did actually, but it may not have been entirely obvious, and you may not have completely understood each step you took. I'm trying > to use it in a Prefs Pane. But, it didn't work. > > So I tried using the Core Data Entity tool to let IB do it, and it > disables the Add and Remove buttons. > >

This doesn't seem like it is coming from any of my methods, of which there are almost none anyway. have a peek at these guys The first answer they gave me was to bind the array controller to the view controller running the view with a model key path of self.view.window.windowController.document.managedObjectContex. SMS verification, is it secure? This incident will be reported Operator ASCII art Is it ethical for a journal to cancel an accepted review request when they have obtained sufficient number of reviews to make a

I am lost, any suggestions on how to do a one to many relationship across tabs on a multi-tab view controller setup like this? When you finish, it will give you an array, or more if necessary. But I'm not sure why its doing that... check over here Tab one is a view controller with a table, and an array controller that is bound to an entity called Profiles and the tableview is bound to that controller with +/-

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Alternately you might be able to add an entity to your model that just tracks the selected item then use that to control what is shown in the second tab. –theMikeSwan

Hint :configure your browser Monospace font in the Preferences. How can I remove an Online Account? If so, how can I track it down? > > Thanks, > Haris > > > _______________________________________________ > Do not post admin requests to the list. objective-c cocoa core-data cocoa-bindings share|improve this question asked Aug 9 '11 at 14:10 Cragly 1,66573251 add a comment| 3 Answers 3 active oldest votes up vote 5 down vote accepted Bindings

The problem is that you're binding the Array Controller to File's Owner… but File's Owner is used primarily only for document-based applications. thanks Frank Edited to add: BTW, I have on some of those tabs, like the command tab multiple tables configured in one to many relationships on the same tab that work Could also cause this problem, maybe. this content dynamic var mainContext:NSManagedObjectContext!

Thanks.... If you look in your Interface Builder doc window, there should automatically be an appName_AppDelegate object (I'm using Snow Leopard, YMMV). This doesn't seem like it > is coming from any of my methods, of which there are almost none > anyway. What is the total sum of the cardinalities of all subsets of a set?

In the tutorial, it seemed to "just work," and I didn't set anything up explicitly. Following the track of correctly managing CoreData-document loading How to determine when CoreData's data isloaded? r/champourlier's public tech way R/C's tech blog: development, technical tips'n'tricks, mostly on iPhone SDK Home About me Home > Cocoa, CoreData > More on the "Cannot perform operation without a managed What am I missing?

So in case anyone else runs into this problem, make sure you set the managedObjectContext binding for all controllers that need it. :-) On Jul 9, 2005, at 11:24 AM, Charilaos I have an NSArrayController in xib file which is bound to Entity and NSManagedObjectContext in IB: // Bind To Delegate self.mainContext It seems Array controller is accessing mainContext before it is Is it possible to use this stuff in a prefs pane? It gets instantiated when app loads.

EDIT 2: Evidently mainContext is not nil as calling it here works correctly func applicationDidFinishLaunching(aNotification: NSNotification) { // Insert code here to initialize your application let request = NSFetchRequest(entityName: "AP_EntityA") let