corrected commit#2

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mlyubarskyy wants to merge 2 commits intokovyrin:masterfrom

mlyubarskyy:master

Commits on May 22, 2012

make it work with ActiveResource

mlyubarskyy
authored and
UGE-developer2
committed

Commits on May 30, 2012

use a default value of nil (this doesn't work with raise_on_invalid)
UGE-developer2
committed