projects.js.coffee e project.js

gistfile1.txt

JQuery ->
  $('form').on 'click' , '.remove_fields', (event) ->
    $(this).prev('input[type=hidden]').val(1)
    $(this).closest('fieldset').hide()
    event.preventDefault()
    
Depois de gerado ele fica assim:

(function() {
  JQuery(function() {
    return $('form').on('click', '.remove_fields', function(event) {
      $(this).prev('input[type=hidden]').val(1);
      $(this).closest('fieldset').hide();
      return event.preventDefault();
    });
  });

}).call(this);