Hello,

I've tried your suggestion and worked!. At 'before_update' stored old 
>> values in request.vars using Set object, then at 'after_update' access 
>> these values and compare to the new ones at f.
>>
>
> Be careful about storing something in request.vars, as some other code may 
> depend on request.vars and end up failing due to it being changed.
>

Any alternative you can suggest?. Session object seems error prone for this 
because of concurrency...
 

Note: if you use 'detect_record_change=True' it seems 'before_update' is 
>> called twice, though it doesn't matter in my case.
>>
>
> That doesn't sound right. Can you figure out where that is happening? Do 
> you have an onchange callback that does an update on a change? Does your 
> before_update callback return a non-falsey value in that case (that's the 
> only reason the before_update callback would fire without being followed by 
> an update and then the after_update callback)? Do you have record 
> versioning enabled?
>

My fault. I was executing an unneeded 'update_record' after 'form.process', 
so i was triggering the callbacks twice (residual code from tests). Sorry.

Regards.

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