[baseten-users] Notifications Problem solved

[Michael Ruepp]

I am really blind, the ObjectIDs came along with the notification  
userinfo.


Sorry for all the mess!!!!


Cheers, Mike


On 08.10.2009, at 15:22, Michael Ruepp wrote:

> Hi all,
>
> I need some help regarding baseten notifications.
>
> Challenge:
>
> 1. I have a GUI only App with a one to many relationship: Group ->  
> Persons
>
> Group has the Properties
> name (String)
> modified (BOOL)
>
> Persons has the  Properties
> name (String)
> preName (String)
> lastName (String)
> dateCreated
> modified (BOOL)
>
> I want to achieve, that when I change something in the Persons  
> Table, that the Group.modified property changes to YES (or  
> whatsoever).
> I want to achieve that when I change wether preName or lastName,  
> that the name Property changes to "preName_lastName".
>
> I thought about ValueTransformers, but arent they just for display  
> purposes?
> I tried with subclassing of BXManagedObject and put it in the Custom  
> Class Name of the BXSynchronisedArrayController Object in IB, then  
> bind the Value of the respective Column to the function setName, it  
> works occasionally, but when I connect the second Time I get:
>
> 08.10.09 12:03:40	FCL_01[32257]	Cocoa Bindings: Error accessing  
> value for key path name of object <BXDatabaseObject (0x20021d3a0) pgsql://sunrise-big.local/fuse/public/files?id,n=1 
>  fault: 1> (from bound object <NSTableColumn: 0x20009c520>	 
> identifier: (null) with object ID 1001 in nib named MainMenu.nib):  
> [<BXDatabaseObject 0x20021d3a0> valueForUndefinedKey:]: this class  
> is not key value coding-compliant for the key name.
>
> The Code:
>
> @interface PersonsBO : BXDatabaseObject {
>
> 	BXDatabaseContext*	ctx_delegate_;
> 	
>
> }
>
>
>
> 	@property (nonatomic, retain) NSString *name;
> 	@property (nonatomic, readonly) NSString *preName;
> 	@property (nonatomic, readonly) NSString *lastName;
>
> - (NSString*)setName;
>
> @end
>
>
> @implementation PersonsBO
>
> @dynamic name;
> @dynamic preName;
> @dynamic lastName;
>
>
> -(void)awakeFromInsert {
> 	[self setValue:[NSDate date] forKey:@"dateCreated"];
> }
>
> - (NSString *)setName {
> 	
> 		
> 	NSError* error = nil;
>
> 	if (self.name != nil) {
> 		return self.name;
> 	}
> 	if (self.preName == nil || self.lastName == nil) {
> 		[self setValue:@"untitled" forKey:@"name"];
> 		[ctx_delegate_ save:&error];
> 		return [NSString stringWithFormat:@"No Name"];
> 	}
> 	[self setValue:[NSString stringWithFormat:@"%@ %@", self.preName,  
> self.lastName] forKey:@"name"];
>     return [NSString stringWithFormat:@"%@.%@", self.preName,  
> self.lastName];
> }
>
>
>
> 2. Code only:
> I successfully created a BXSynchronisedArrayController in my Model  
> Class (at Init). How can I track the Controller for Object changes  
> which returns me the specific Object, which changed?
>
>
>
> 			group_ = [[BXSynchronizedArrayController alloc]init];
> 			[group_ setEntityDescription:[context_ entityForTable: @"group"  
> error: NULL]];
> 			[group_ setTableName:@"group"];
> 			[group_ setFetchesAutomatically:YES];
> 			[group_ setDatabaseContext:context_];
> 			[group_ fetchWithRequest:nil merge:YES error:&error];
>
> I receive already Notifications, but they just return the  
> BXEntitiyDescription as stated in the Manual. But I need the  
> specific Object to set the Modified BOOL of the specific container  
> Group to YES.
>
> 		//Establish Notification for Context and change Root Modified date  
> on occurness of directory changes
> 		NSNotificationCenter* ctx_ns_center = [context_ notificationCenter];
> 		NSLog(@"Ctx ns center: %@",(NSString*)ctx_ns_center);
> 		[ctx_ns_center addObserver:self
> 					  selector:@selector(contextChanged:)
> 						  name:kBXInsertNotification object:nil];
> 		[ctx_ns_center addObserver:self
> 						  selector:@selector(contextChanged:)
> 							  name:kBXUpdateNotification object:nil];
> 		[ctx_ns_center addObserver:self
> 						  selector:@selector(contextChanged:)
> 							  name:kBXDeleteNotification object:nil];
>
> with this function (but I dont know the specific Object which  
> changed):
>
> -(void)contextChanged:(NSNotification *)notification
> {
> 	if (![notification name])  {
> 		return;
> 	}
> 	[self doSomething]];
> 	
> 	NSLog(@"Context received message = %@",[notification name]);
>
> }
>
>
>
>
>
> How can I achieve this with KVO? I should not add an observer for a  
> specific key path, but should observe the whole  
> BXSynchronisedArrayController for changes and trigger a function  
> which receive as parameter the BXDatabaseObject which changed.
>
> I tried this in the init section (When I try without  
> "toObjectsAtIndexes:",
> then I get a error message:
> "08.10.09 15:02:41	FSRV_RW_01[34467]	[<NSCFArray 0x2000732c0>  
> addObserver:forKeyPath:options:context:] is not supported. Key path:  
> group :"
>
>
>
> 			groupContainer_ = [context_ executeFetchForEntity: [context_  
> entityForTable: @"group" error: NULL] withPredicate: nil  
> excludingFields:nil updateAutomatically:YES error: NULL];
> 			[groupContainer_ setOwner:self];
> 			[groupContainer_ setKey:@"groupChanged"];
> 			NSIndexSet *allIndexes = [NSIndexSet  
> indexSetWithIndexesInRange:NSMakeRange(0, [groupContainer_ count])];
> 			[groupContainer_ addObserver:self toObjectsAtIndexes:allIndexes  
> forKeyPath:@"group" options:0 context:@"groupChanged"];
>
> with this:
>
> - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id) 
> object change:(NSDictionary *)change context:(void *)context {
> 	NSLog(@"Observer KeyPath %@",keyPath);
>     if ([keyPath isEqual:@"groupChanged"]) {
> 		[self doSomething];
> 	}
> }
>
>
> But I dont get any notification from KVO!
>
>
>
>
> Thanks very much for help,
>
> Mike
>
> _________________
> michael ruepp
> michael at ruepp.at
> fon +41 76 593 04 49
> skype michaelruepp
>
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_________________
michael ruepp
michael at ruepp.at
fon +41 76 593 04 49
skype michaelruepp

CONFIDENTIALITY NOTICE
This message (including any attachments transmitted with it) contains  
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Please notify the sender immediately by e-mail if you have received  
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