AlexDenisov/iActiveRecord — pull request #71 by jklimke (2014-02-20 10:28:14+00:00)
Title: checked whether the value to set is nil and return @"null" as sql repres...

with the current solution, NSDate columns could not be set as nil -> if this happened, the date was setz to jan 1st 1970 since an offset value of 0 was returned. Ich changed the sql serialization to return a @"null" string