pgfqe6ch8/app/views/department/destroy.js.erb

for(var i=0; i<$("#apply_add_department_<%= @department.id %>").nextAll().length; i++){
    var index = parseInt($($("#apply_add_department_<%= @department.id %>").nextAll()[i]).children(":first").html());
    $($("#apply_add_department_<%= @department.id %>").nextAll()[i]).children(":first").html(index - 1);
}
$("#apply_add_department_<%= @department.id %>").remove();