"modify data on a record before it's inserted/updated" 

_before_insert and _before_update take your "near to be committed record" 
and alter it in memory, then it inserts/update it. Don't know what are you 
asking for that is different from what web2py does.


-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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