I have a problem with Core Data and bindings that I can't work out. Here's the data model:
<<inline: Data Model2.jpg>>
It's a music app, and I'm trying to set up MIDI instrument customization for the user. The interface let's the user create new Instruments (MnS_Instrument entities) which map a name to a port and channel, new Articulations (Articulations entities) which map a name to a set of MIDI messages (controller changes, program changes, etc.), and then to assign the Articulations to Instruments. I have an array controller for each entity in the model. The AssignedArticulation controller gets its contentSet from [MnS_Instrument_controller selection].articulations, and the MIDIMessage controller gets its contentSet from [Articulation_controller selection].messages. (Note that I'm not hosting AUs yet, so virtualInstrument isn't used.) Everything works as expected, up to the assignment of articulations to instruments. I have a window with two tables: one showing the available instruments, and one for adding articulations to the selected instrument. The selection in the first table is bound to the [MnS_Instrument_Controller arrangedObjects].name, so that clicking a name selects a particular MnS_Instrument. The second table uses combo boxes for choosing which articulation to add; "+" and "-" buttons below the table are bound to the add: and remove: methods of AssignedArticulation_Controller. The available articulations, listed as choices in the combo boxes, are supplied by Articulation_controller, and they show up as expected. The value of the table selection is bound to [AssignedArticulation_Controller selection].articulation.name, the idea being that the AssignedArticulation will grab a named articulation from the set of stored Articulations, and assign it to the instrument. But when I release the combo box, it reverts back to "No Value" and won't make the assignment. Any ideas? J.
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