Ok guys, finally gem caused several issues, which was hard to debug, so finally I just set up my own jquery validation, and it was no so hard as I imagined. Like this solution, not always gems are suitable, and it was good practice)
Now that you have a solution in hand that *does* work for you,
refactor it into it's own gem so you can reuse it, and push it up.
Maybe you'll make someone else's day better!