Right, I don't actually need two separate NSArrayControllers, I suppose my problem is, I'm trying to 1)bind a table column to the value (name) of the columns, but only ones that are contained in the selected document in the parent. and 2) add a column only to the current selected document (the to-many relation) so that when I change the selected document in one table view, only that selected one's columns are shown in the second table view (selection.columns.columnName) but I can't get the binding to work because of errors:
I actually disposed of the second Array Controller and added an addColumn: method to the first controller:
#import "SheetController.h"
@implementation SheetController
- (IBAction)addColumn:(id)sender
{
id object = [self valueForKeyPath:@"selection.columns"];
NSLog(@"object is %@",object);
[object add:sender];
//NSLog(@"Sent to super from subclass");
}
@end
when I invoke this method I get this NSLog result "object is <NO SELECTION MARKER>" and an error: [_NSStateMarker add:]: selector not recognized [self = 0x306210]....
So what I'm guessing is that the to-many is empty, and the columns keypath is wrong??
BTW, Thanks for you help. On 平成 17/02/05, at 13:19, Christiaan Hofman wrote: If I understand you correctly, you have an array of model objects (managed by NSArrayController1), and each model object has (its own) array of objects (managed by NSArrayController2).
First of all: do you want to have a separate NSArrayController2 for each of the arrays in the model objects? Or do you want to manage one array at a time (the selected one)?
In any case, I would say that you use the 'add' method of NSArrayController2 to add an object to the array. If you link the contents of NSArrayController2 to the 'column' of the selection of NSArrayController1, this should work OK. Certainly if your model objects implement the KVC methods to access an array, this should be noticed properly.
On Feb 5, 2005, at 22:42, アンドレ（Andre） wrote:
Hi, just getting started with bindings (read almost all of the apple docs)
and have a fairly good idea how bindings work (KVO/KVC/KVB) and
read up on NSController and NSArrayController etc. but I am having a problem
to associate the objects in one NSArrayController to another.
Here is my object graph: NSArrayController containing the model object that has a few to-one
properties, and one that contains a to-many relationship (NSArray)
and another NSArrayController that contains another model that I want
to insert into the array in the first...
Put into easier terms, I have a table object (NSArrayController1) that has some properties,
and then I have some column objects (NSArrayController2), now when I add/insert objects
into Controller 2, I actually want it to go into NSArrayController1.columns (or the current selection).
I am trying to override the add method on the second arraycontroller to send it to table.columns (the NSArray)
but I wonder how to do this... with KVB? (objectForKey:selection.column)? and then manually insert
it? Doesn't this short circuit validation because the NSArrayController wouldn't manage one of the NSArray
it is holding?
Just wondering how other people handle to-many relationships and piping the add actions of one
group of objects (displayed in a table view) to add to the selected object(s) in another array?
Thanks for any help!
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