Change production state from transform

I am looking for a simple way to trigger device production state change from event transform. My original need is to change device state from decommissioned to production everytime particular trap sent from the device is received. My Zenoss version (please bear with me) is 2.5.1
I tried something like

d=dmd.Devices.findDevice(evt.device)
if d and d.id == 'foo' and d.productionState=-1:
d.productionState=1000

but this does not work, maybe because it is left uncommited, and I could not find a way to produce here the commit() that I am doing in zendmd for the same thing to take effect.

In advance, thanks for your help, and sorry if this is the wrong place for asking this question.