Making Managed Object Context available to array controller in Storyboard scene
Making Managed Object Context available to array controller in Storyboard scene
- Subject: Making Managed Object Context available to array controller in Storyboard scene
- From: Eric Gorr <email@hidden>
- Date: Mon, 14 Mar 2016 20:40:03 -0400
I have a core data, document based, storyboard OS X application.
There is a test project here:
https://github.com/ericgorr/sb_ac_doc
which is just the default project Xcode creates with a few modifications.
I have a single view controller and the view contains a table view which will eventually display the data in the Core Data document. I will also using an array controller to manage the rows for the table view.
The three scenes are:
- Application Scene
- Window Controller Scene
- Main View Controller Scene
The *Main View Controller Scene* contains the *TestItem Array Controller*.
The *TestItem View Controller* contains the code:
class ViewController: NSViewController
{
var context: NSManagedObjectContext?
//
// ...
//
}
The *TestItem Array Controller* contains the Parameters Binding:
Managed Object Context
Bind to: Main View Controller
Model Key Path: context
In Document.swift:
override func makeWindowControllers()
{
let moc = self.managedObjectContext!
// Returns the Storyboard that contains your Document window.
let storyboard = NSStoryboard(name: "Main", bundle: nil)
let windowController = storyboard.instantiateControllerWithIdentifier( "Document Window Controller" ) as! NSWindowController
let contentController = windowController.contentViewController as! ViewController
NSLog( "%@", self.managedObjectContext! )
contentController.context = self.managedObjectContext!
NSLog( "%@", contentController.context! )
self.addWindowController( windowController )
}
This is my attempt to pass the MOC to the view controller before the array controller attempts to access it.
The NSLog's both print out valid values.
However, I am getting the following crash:
2016-03-13 20:13:02.667 sb_ac_doc[73021:16415257] Cannot perform operation without a managed object context
2016-03-13 20:13:02.669 sb_ac_doc[73021:16415257] (
0 CoreFoundation 0x00007fff956f9ae2 __exceptionPreprocess + 178
1 libobjc.A.dylib 0x00007fff9a09073c objc_exception_throw + 48
2 CoreFoundation 0x00007fff956f998d +[NSException raise:format:] + 205
3 AppKit 0x00007fff8c8224e7 -[_NSManagedProxy _managedObjectContext] + 66
4 AppKit 0x00007fff8c822507 -[_NSManagedProxy _persistentStoreCoordinator] + 22
5 AppKit 0x00007fff8c82257a -[_NSManagedProxy _entity] + 46
6 AppKit 0x00007fff8c822802 -[_NSManagedProxy fetchRequestWithSortDescriptors:limit:] + 89
7 AppKit 0x00007fff8c821fec -[NSObjectController(NSManagedController) _executeFetch:didCommitSuccessfully:actionSender:] + 75
8 AppKit 0x00007fff8c5c18c2 -[NSController _controllerEditor:didCommit:contextInfo:] + 185
9 CoreFoundation 0x00007fff955c417c __invoking___ + 140
10 CoreFoundation 0x00007fff955c3fce -[NSInvocation invoke] + 286
11 CoreFoundation 0x00007fff95663be6 -[NSInvocation invokeWithTarget:] + 54
12 Foundation 0x00007fff87cce345 __NSFireDelayedPerform + 377
13 CoreFoundation 0x00007fff9563fbc4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
14 CoreFoundation 0x00007fff9563f853 __CFRunLoopDoTimer + 1075
15 CoreFoundation 0x00007fff956bde6a __CFRunLoopDoTimers + 298
16 CoreFoundation 0x00007fff955facd1 __CFRunLoopRun + 1841
17 CoreFoundation 0x00007fff955fa338 CFRunLoopRunSpecific + 296
18 HIToolbox 0x00007fff8add1935 RunCurrentEventLoopInMode + 235
19 HIToolbox 0x00007fff8add1677 ReceiveNextEventCommon + 184
20 HIToolbox 0x00007fff8add15af _BlockUntilNextEventMatchingListInModeWithFilter + 71
21 AppKit 0x00007fff8c25e0ee _DPSNextEvent + 1067
22 AppKit 0x00007fff8c62a943 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454
23 AppKit 0x00007fff8c253fc8 -[NSApplication run] + 682
24 AppKit 0x00007fff8c1d6520 NSApplicationMain + 1176
25 sb_ac_doc 0x0000000100002427 main + 87
26 libdyld.dylib 0x00007fff987455ad start + 1
)
What is the correct pattern I should use so the array controller can access the MOC of the document?
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