After a great amount of trial and error, It is my belief that I would
like to use Core Data with bindings in order to keep my UI synced
with my model objects. Here's the summary:
I have a custom view (CellMapView) controlled by a custom window
controller (CellMapController) in an NSPersistentDocument-based
application. In my nib for the Cell Map window there is an
NSArrayController that is set up to manage a "Cell" entity (and bound
to my documents managedObjectContext) which I would like to mediate
between all of my Cell models and the CellMapView. So there is a
button "New Cell". This is connected to the NSArrayController's
"add:" action. When the user clicks it, a new Cell entity is entered
in to the MOM and all is good in the world. But wait! There's more...
Adding a cell, in addition to creating a new Cell entity, also has to
do some custom tasks on initialization. Each cell has a one-to-one
relationship with another managed object (Scene), so the scene object
needs to be created and inserted in to the MOM when the cell is
created. Also, the starting location of the cell in the CellMapView
is determined by fetching all existing cells in the context and
figuring out the first spot that is not occupied by a previously
created cell.
I thought I had finally figured it out -- I subclass my cells
ArrayController (CellsArrayController) and override the -newObject
method to create the scene and set the starting location of the
cell. But when the scene entity is created and the relationship
between the cell and the scene is established, for some reason the
"arrangedObjects" of my cells controller adds the cell being created
twice. Exact same address in memory, but their are two of them.
What gives? Is overriding "newObject" not the way to go in my
situation?
Thanks,
Mike
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