anchor.diff:          <%= vc_builder.number_field :cost %>
         </div>  
       <% end %>
  -  
  -
  -<!--     <div class="form-group row">
  -      <label class="col-1 col-form-label"><%#= f.label "Volume" %></label>
  -      <input type="number" id="product_volume_costs_attributes_0_volume" name="product[volume_costs_attributes][0][volume]">
  -      <label class="col-1 col-form-label"><%#= f.label "Cost" %></label>
  -      <input type="number" id="product_volume_costs_attributes_0_cost" name="product[volume_costs_attributes][0][cost]">
  -    </div>
  -
  -    <div class="form-group row">
  -      <label class="col-1 col-form-label"><%#= f.label "Volume" %></label>
  -      <input type="number" id="product_volume_costs_attributes_1_volume" name="product[volume_costs_attributes][1][volume]">
  -      <label class="col-1 col-form-label"><%#= f.label "Cost" %></label>
  -      <input type="number" id="product_volume_costs_attributes_1_cost" name="product[volume_costs_attributes][1][cost]">
  -    </div>
  -
  -    <div class="form-group row">
  -      <label class="col-1 col-form-label"><%#= f.label "Volume" %></label>
  -      <input type="number" id="product_volume_costs_attributes_2_volume" name="product[volume_costs_attributes][2][volume]">
  -      <label class="col-1 col-form-label"><%#= f.label "Cost" %></label>
  -      <input type="number" id="product_volume_costs_attributes_2_cost" name="product[volume_costs_attributes][2][cost]">
  -    </div> -->
   
       <div class="actions">
         <%= f.submit %>
  
positive.code: <div class="container">
    <%= form_for(@product) do |f| %>
  
      <div class="form-group row">
        <label class="col-1 col-form-label"><%= f.label :name %></label>
  
negative.code:       </div>
      </div>
  
      <%= f.fields_for :volume_costs do |vc_builder| %>
        <div class="form-group row">
          <label class="col-1 col-form-label"><%= vc_builder.label "Volume" %></label>
  