The transaction is atomic, that means there's nothing happening in the 
middle. Your use case is fine. Of course, that if you give the user a form, 
while he's editing it, the form can be changed by others as well, in that 
case you need to add your own locking or check the record for modifications 
while the user was editing the form.

-- 
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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