Why am I getting the error "class ... must be registered with registerSubclass before using Parse" when I register a subclass?
After upgrading from iOS parse-library-1.6.3 to parse-library 1.7.5, I get the following error in the queryForTable of one of my PFQueryTableViewControllers:
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'The class Appname.AttendingModel must be registered with registerSubclass before using Parse.'
However, I register the subclass in my application: didFinishLaunchingWithOptions: using this code:
AttendingModel.initialize()
Parse.enableLocalDatastore()
Parse.setApplicationId(Config.parseAppId, clientKey: Config.parseClientKey)
The initialization method AttendingModel looks like this:
override class func initialize() {
var onceToken : dispatch_once_t = 0;
dispatch_once(&onceToken) {
self.registerSubclass()
}
}
and the parse class name is also set:
class func parseClassName() -> String {
return "Attending"
}
I have verified that the line self.registerSubclass()
in my method initialize
is called when the application starts, but I still get the error.
I must add that I am using Xcode 6.4 and working on iOS 8.4.
Here's the full stack trace of the error:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'The class Appname.AttendingModel must be registered with registerSubclass before using Parse.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000108354c65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000107fedbb7 objc_exception_throw + 45
2 CoreFoundation 0x0000000108354b9d +[NSException raise:format:] + 205
3 Appname 0x00000001060cb9f0 +[PFObject query] + 120
4 Appname 0x000000010607fe73 _TFC8Appname 12UsersTableVC13queryForTablefS0_FT_CSo7PFQuery + 131
5 Appname 0x00000001060800c2 _TToFC8Appname 12UsersTableVC13queryForTablefS0_FT_CSo7PFQuery + 34
6 Appname 0x000000010613fac5 -[PFQueryTableViewController loadObjects:clear:] + 106
7 Appname 0x000000010613f3b7 -[PFQueryTableViewController viewDidLoad] + 59
8 Appname 0x000000010607fb3d _TFC8Appname 12UsersTableVC11viewDidLoadfS0_FT_T_ + 61
9 Appname 0x000000010607fde2 _TToFC8Appname 12UsersTableVC11viewDidLoadfS0_FT_T_ + 34
10 UIKit 0x0000000108c211d0 -[UIViewController loadViewIfRequired] + 738
11 UIKit 0x0000000108c213ce -[UIViewController view] + 27
12 Appname 0x0000000106097e13 _TFC8Appname 7UsersVC11viewDidLoadfS0_FT_T_ + 1347
13 Appname 0x0000000106098392 _TToFC8Appname 7UsersVC11viewDidLoadfS0_FT_T_ + 34
14 UIKit 0x0000000108c211d0 -[UIViewController loadViewIfRequired] + 738
15 UIKit 0x0000000108c213ce -[UIViewController view] + 27
16 UIKit 0x0000000108c46257 -[UINavigationController _startCustomTransition:] + 633
17 UIKit 0x0000000108c5237f -[UINavigationController _startDeferredTransitionIfNeeded:] + 386
18 UIKit 0x0000000108c52ece -[UINavigationController __viewWillLayoutSubviews] + 43
19 UIKit 0x0000000108d9d6d5 -[UILayoutContainerView layoutSubviews] + 202
20 UIKit 0x0000000108b709eb -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 536
21 QuartzCore 0x0000000106dceed2 -[CALayer layoutSublayers] + 146
22 QuartzCore 0x0000000106dc36e6 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
23 QuartzCore 0x0000000106dc3556 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
24 QuartzCore 0x0000000106d2f86e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242
25 QuartzCore 0x0000000106d30a22 _ZN2CA11Transaction6commitEv + 462
26 QuartzCore 0x0000000106d310d3 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 89
27 CoreFoundation 0x0000000108287ca7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
28 CoreFoundation 0x0000000108287c00 __CFRunLoopDoObservers + 368
29 CoreFoundation 0x000000010827da33 __CFRunLoopRun + 1123
30 CoreFoundation 0x000000010827d366 CFRunLoopRunSpecific + 470
31 GraphicsServices 0x000000010a83ea3e GSEventRunModal + 161
32 UIKit 0x0000000108af08c0 UIApplicationMain + 1282
33 Appname 0x0000000105ffd9f7 main + 135
34 libdyld.dylib 0x000000010ba8c145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Any idea what could be causing this? I am using the same registerSubclass mechanism for several other classes in this application and PFQueryTableViewControllers for other classes work fine.
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The problem was my initialization function in the AttendingModel class. Using dispatch_once_t as a local var in a function does not serve to ensure that the subclass is registered exactly once, and the constant re-registration of the subclass seemed to cause problems for Parse.
Changing the initialization function to look like this fixed the problem:
private static var onceToken : dispatch_once_t = 0
override class func initialize() {
dispatch_once(&onceToken) {
self.registerSubclass()
}
}
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