Cocoa Bindings to new NSManagedObject
Question
I am new to this, so I will lay out what I am doing and please correct any mistakes.
In my AppDelegate, I have a @property for an NSManagedObject subclass, "Entry". When I press a button on the main window to create a new Entry, I first instantiate the property:
_entry = (Entry*)[NSEntityDescription
insertNewObjectForEntityForName:@"Entry"
inManagedObjectContext:[self managedObjectContext]];
then I open up a new window by calling
[inputWindow makeKeyAndOrderFront:nil];
This inputWindow has Cocoa Bindings to the entry's properties. When I submit, I do the usual save
[[self managedObjectContext] save:&error];
and then
[inputWindow performClose:nil];
This seems pretty straight forward, but I get an error:
2014-01-11 22:57:32.906 WriteOffs[66441:303] CoreData: error: Failed to call designated initializer on NSManagedObject class 'Entry'
2014-01-11 22:57:32.943 WriteOffs[66441:303] An uncaught exception was raised
2014-01-11 22:57:32.943 WriteOffs[66441:303] [<Entry 0x6100000ba040> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".
It seems that entry is null, implying that the inputWindow and its bindings are instantiated before I click the button on the main window to create the new entry and open up the inputWindow.
Seems like there is a simple solution that I am missing.
EDIT:
Here's what I have. In WOAppDelegate.h,
#import <Cocoa/Cocoa.h>
#import "Entry.h"
@interface WOAppDelegate : NSObject <NSApplicationDelegate>
@property (assign) IBOutlet NSWindow *window;
@property (assign) IBOutlet NSWindow *inputWindow;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
- (IBAction)saveAction:(id)sender;
@property (weak, nonatomic) Entry *entry;
@end
Then in WOAppDelegate.m
#import "WOAppDelegate.h"
@implementation WOAppDelegate
@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
@synthesize managedObjectModel = _managedObjectModel;
@synthesize managedObjectContext = _managedObjectContext;
@synthesize inputWindow = _inputWindow;
@synthesize entry = _entry;
// Core Data Stuff...
Entry.h
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@interface Entry : NSManagedObject
@property (nonatomic, retain) NSNumber * amount;
@property (nonatomic, retain) NSString * category;
@property (nonatomic, retain) NSDate * date;
@property (nonatomic, retain) NSString * payee;
@property (nonatomic, retain) NSString * text;
@end
Entry.m
#import "Entry.h"
@implementation Entry
@dynamic amount;
@dynamic category;
@dynamic date;
@dynamic images;
@dynamic payee;
@dynamic text;
@end
Pretty simple. In my MainMenu.xib, I have the main window, and the inputWindow. I have an array controller binded to the managedObjectContext that fills in content for the table on the main window. I also have a second window for entering in new entries to the table. This is bonded to the property, entry.
Thanks again for the help,
Chet
2 answers
solution1
0 2014-01-12 08:39:34
Does your “Entry” class maybe override some of the methods in NSManagedObject? Maybe even
- (id)initWithEntity:(NSEntityDescription *)entity insertIntoManagedObjectContext:(NSManagedObjectContext *)context;
If so, do you fail to call -super in any of your subclass's methods?
solution2
0 2014-01-13 02:59:29
In the array controller, I had mode:Class referencing the Entry class. I changed that to mode:Entity referencing the Entry entity and everything worked out. :)
Can someone comment on why the debugger is so bad at giving a meaningful response? Where in the error message could have pointed me to this being the error?
2014-01-12 18:35:31.520 WriteOffs[68395:303] CoreData: error: Failed to call designated initializer on NSManagedObject class 'Entry'
2014-01-12 18:35:31.555 WriteOffs[68395:303] An uncaught exception was raised
2014-01-12 18:35:31.555 WriteOffs[68395:303] [<Entry 0x6100000a9a20> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".
2014-01-12 18:35:31.556 WriteOffs[68395:303] (
0 CoreFoundation 0x00007fff8b93f41c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff944f3e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8b93efc9 -[NSException raise] + 9
3 CoreData 0x00007fff89650b14 -[NSManagedObject valueForUndefinedKey:] + 276
4 Foundation 0x00007fff91eff49f -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 334
5 AppKit 0x00007fff89c872d3 -[NSBinder valueForBinding:atIndex:resolveMarkersToPlaceholders:] + 408
6 AppKit 0x00007fff89963567 -[NSValueBinder _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:] + 622
7 AppKit 0x00007fff8a022008 -[NSValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 143
8 AppKit 0x00007fff89f9e2ee -[NSTextValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 73
9 CoreFoundation 0x00007fff8b873639 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 137
10 CoreFoundation 0x00007fff8b872ddf -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 319
11 AppKit 0x00007fff8a062ac7 -[_NSBindingAdaptor tableColumn:willDisplayCell:row:] + 108
12 AppKit 0x00007fff89b8ada0 -[NSTableView preparedCellAtColumn:row:] + 615
13 AppKit 0x00007fff89b8a9ee -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 44
14 AppKit 0x00007fff89b8a723 -[NSTableView drawRow:clipRect:] + 1629
15 AppKit 0x00007fff89b89f7d -[NSTableView drawRowIndexes:clipRect:] + 776
16 AppKit 0x00007fff89a534c2 -[NSTableView drawRect:] + 1484
17 AppKit 0x00007fff89a2c399 -[NSView _drawRect:clip:] + 3748
18 AppKit 0x00007fff89a2ac0e -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1799
19 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
20 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
21 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
22 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
23 AppKit 0x00007fff89a28a50 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 841
24 AppKit 0x00007fff89a28201 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 314
25 AppKit 0x00007fff89a25209 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2828
26 AppKit 0x00007fff89a0463a -[NSView displayIfNeeded] + 1680
27 AppKit 0x00007fff89a1e246 -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 1972
28 AppKit 0x00007fff89a1d7f0 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 786
29 AppKit 0x00007fff89a1d470 -[NSWindow orderWindow:relativeTo:] + 162
30 AppKit 0x00007fff898bbc26 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1406
31 AppKit 0x00007fff898b05fe loadNib + 327
32 AppKit 0x00007fff898afb9c +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 288
33 AppKit 0x00007fff898af98c -[NSBundle(NSNibLoading) loadNibNamed:owner:topLevelObjects:] + 197
34 AppKit 0x00007fff898af77b +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 357
35 AppKit 0x00007fff898ab617 NSApplicationMain + 448
36 WriteOffs 0x0000000100002e02 main + 34
37 libdyld.dylib 0x00007fff8eddf5fd start + 1
38 ??? 0x0000000000000003 0x0 + 3
)
2014-01-12 18:35:31.640 WriteOffs[68395:303] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Entry 0x6100000a9a20> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff8b93f41c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff944f3e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8b93efc9 -[NSException raise] + 9
3 CoreData 0x00007fff89650b14 -[NSManagedObject valueForUndefinedKey:] + 276
4 Foundation 0x00007fff91eff49f -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 334
5 AppKit 0x00007fff89c872d3 -[NSBinder valueForBinding:atIndex:resolveMarkersToPlaceholders:] + 408
6 AppKit 0x00007fff89963567 -[NSValueBinder _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:] + 622
7 AppKit 0x00007fff8a022008 -[NSValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 143
8 AppKit 0x00007fff89f9e2ee -[NSTextValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 73
9 CoreFoundation 0x00007fff8b873639 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 137
10 CoreFoundation 0x00007fff8b872ddf -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 319
11 AppKit 0x00007fff8a062ac7 -[_NSBindingAdaptor tableColumn:willDisplayCell:row:] + 108
12 AppKit 0x00007fff89b8ada0 -[NSTableView preparedCellAtColumn:row:] + 615
13 AppKit 0x00007fff89b8a9ee -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 44
14 AppKit 0x00007fff89b8a723 -[NSTableView drawRow:clipRect:] + 1629
15 AppKit 0x00007fff89b89f7d -[NSTableView drawRowIndexes:clipRect:] + 776
16 AppKit 0x00007fff89a534c2 -[NSTableView drawRect:] + 1484
17 AppKit 0x00007fff89a2c399 -[NSView _drawRect:clip:] + 3748
18 AppKit 0x00007fff89a2ac0e -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1799
19 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
20 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
21 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
22 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
23 AppKit 0x00007fff89a28a50 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 841
24 AppKit 0x00007fff89a28201 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 314
25 AppKit 0x00007fff89a25209 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2828
26 AppKit 0x00007fff89a0463a -[NSView displayIfNeeded] + 1680
27 AppKit 0x00007fff89a1e246 -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 1972
28 AppKit 0x00007fff89a1d7f0 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 786
29 AppKit 0x00007fff89a1d470 -[NSWindow orderWindow:relativeTo:] + 162
30 AppKit 0x00007fff898bbc26 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1406
31 AppKit 0x00007fff898b05fe loadNib + 327
32 AppKit 0x00007fff898afb9c +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 288
33 AppKit 0x00007fff898af98c -[NSBundle(NSNibLoading) loadNibNamed:owner:topLevelObjects:] + 197
34 AppKit 0x00007fff898af77b +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 357
35 AppKit 0x00007fff898ab617 NSApplicationMain + 448
36 WriteOffs 0x0000000100002e02 main + 34
37 libdyld.dylib 0x00007fff8eddf5fd start + 1
38 ??? 0x0000000000000003 0x0 + 3
)
libc++abi.dylib: terminating with uncaught exception of type NSException
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