anchor.diff:  
     <%= f.submit nil, class: 'btn btn-default' %>
   <% end %>
  -
  -<script>
  -$('#tabs a').click(function(e) {
  -  e.preventDefault();
  -  $(this).tab('show');
  -})
  -</script>
  
positive.code:     </div>
  
      <div class="tab-pane" id="tutorial">
        <div class="form-group">
          <%= f.label :title %>
          <%= f.text_field :title, class: 'form-control' %>
        </div>
  <!--       <div class="form-group">
          <%= f.label :body_markdown %><br>
          <%= f.text_area :body_markdown %>
  
negative.code: <script>
  $(function(){
    $('#tabs a').click(function(e){
      e.preventDefault();
      $(this).tab('show');
    });
  });
  </script>
  
  <%= form_for(@tutorial) do |f| %>
  
    <% if @tutorial.errors.any? %>
  