[Pyobjc-dev] Binding problem with NSObjectController

[Ben G. <bg...@ob...>]

I wanted to try out the new binding stuff with pyobjc using the the 1.1 
release and thought I'd write a very simple little app to see how it 
went.  I've used them before on Obj C and they are great.

My app is very simple: it has a class Bump which holds a counter.  When 
you push a button, it uses a binding to send a message to the object 
which increments (bumps) a counter; the current counter is displayed in 
a text field.

It has an instance created in IB and that's hooked up to an object 
controller with the appropriate class (Bump).

When I run the app, the button connection alone appears to work fine.  
However, there are all sorts of problems with the binding from the text 
field to the value in Bump through the NSObjectController.  It looks 
like the NSObjectController is checking for the key value coding 
compliance very early before the python object has been initialised 
(using awakeFromNib).

If I create the instance variable that the binding observes in an 
"init" method in the class (note: not __init__), then the key value 
coding non-compliance warning goes away, presumably because that's 
called early in the object creation process; if I do that then the 
button action stops working.  Sigh.

This is beyond what I can fathom but this does work in Objective C and 
I believe -- and want it to -- work here too.  Any advice appreciated.

	Ben.