First thanks for all the help to date. I'm learning a great deal.
The current problem:
I have a model for which I cannot seem to figure out the correct key
paths for binding.
My doc has a rooms array (of Rooms) and a courses array (with
NSArrayControllers). Each course has a roomConstraint, which contains
a roomCosts array of RoomCosts each of which has a Room*,
"room" (points to an element of the doc's rooms array) and a
"cost" (float).
I can easily bind a table column to the rooms array. I am trying to
bind two table columns to the RoomCosts data fields (each Room is
basically a NSMutableString for now). They change depending on the
currently selected course in a separate tableview.
Earlier, I could make this work in a kludgy way, by creating an
intermediary NSArrayController (selectedCourseRoomCosts) whose
contentArray was bound to
courseController.selection.roomConstraint.roomCosts, and then binding
the table columns to selectedCourseRoomCosts.arrangedObjects.room.name
and selectedCourseRoomCosts.arrangedObjects.cost
When creating each Course object, I would copy the rooms array into
the roomConstraint. Fine. I have no problem keeping that array in
sync with the master rooms array.
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.
Here is some of the relevant code (note that everything is shown here
as an ivar, but they are all properties as well):
@interface ClassSchedulerDoc : NSDocument
{
IBOutlet NSArrayController *courseController;
IBOutlet NSArrayController *roomController;
NSMutableArray *rooms;
NSMutableArray *courses;
}
@implementation RoomArrayController
- (void) addObject:(id) newObject {
[snip]
// Add the object to the rooms array of each course
[courseController addRoom:newObject];
}
@implementation CourseArrayController
- (void) addRoom:(Room *) newRoom {
for (Course *curCourse in [self arrangedObjects]) {
[curCourse addRoom:newRoom];
}
}
@interface CourseRoomConstraint : Constraint {
NSMutableArray * roomCosts; // array of RoomCosts
}
@implementation CourseRoomConstraint
- (void) addRoom:(Room *) newRoom {
[roomCosts addObject:[[RoomCost alloc] initWithRoom:newRoom]];
}
@interface RoomCost : NSObject <NSCoding> {
Room *room; // this is a pointer to the real object in the real Rooms
array - a weak reference
float cost;
}
Thanks in advance,
Dave
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