[PhillyOnRails] AR accessor problem

[Cliff Moon <cliff@chariotsolutions.com>]

I'm trying to track down whether or not a problem I'm having is specific 
to the JRuby platform, or it's an inherent limitation of AR.  What I'm 
trying to do is something like:

cash += tx.gain

where tx is another AR object and gain is a calculated field which isn't 
persistent.  My unit tests keep telling me that I'm trying to call nil.+ 
at this line, despite cash having been explicitly set.  Curiously, the 
problem occurs exactly the same when the code is:

cash = cash + tx.gain

The following work:

blah = cash + tx.gain
cash = blah

and

self[:cash] = cash + tx.gain

So anyone have a clue what's going on here?  Is this just a quirk of AR 
that I've been lucky enough not to have run into until now, or mightn't 
this be something JRuby related?
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