jquery each addClass highlight only the first element, why?

Question

CoffeeScript

I must say right away that I am not strong in jq. Perhaps the answer is something very simple.
I can not understand why only the first element. I checked in the cookies there are several id
Cookies this is a plugin.

$.each Cookies.get('order_item_ids').split(','), (i, id) ->
    $(".a_schedule_item[data-rental-item-id='" + id + "']").addClass('selected')

Answer 1

Try to debug, for example, output to the console Cookies.get('order_item_ids').split(',')and inside the function console.log i, id, it might help.
Logically, everything seems to be correct.