'Same function as get, except .find_one() method is called
instead of .find(), so the first record matching "spec" (or None) is
returned.
Unlike get(), this function might take a long time, depending
on "spec" and the indexes set on colname_passive column.'

def get_one(self, spec, **kargs):

    return self.find_one(self.colname_passive, spec, **kargs)
