On Dec 1, 2009, at 16:19, David Hirsch wrote:
> The problem is, when I add a new Room to the master rooms array, and then add
> that room to the roomCosts array of each Course's roomConstraint, the table
> column doesn't get updated, until I tweak it manually (by adding a new
> course). It is still bound to the existing items in the rooms array - if I
> alter their name, that get observed and reflected in the table, but adding
> new ones does not get observed.
...
> @implementation CourseRoomConstraint
> - (void) addRoom:(Room *) newRoom {
> [roomCosts addObject:[[RoomCost alloc] initWithRoom:newRoom]];
> }
It *looks* like the problem is that you're not adding the RoomCost object
KVO-compliantly. Instead of just adding objects to a NSMutableArray, you should
add them to a KVO-compliant mutable array proxy, something like this:
NSMutableArray* mutableRoomCosts = [self mutableArrayValueForKey:
"roomCosts"];
[mutableRoomCosts addObject: ... etc ];
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