POS-Server/app/views/pre_sales/_pre_sale.html.erb

<tr id="pre_sale_<%= pre_sale.id %>">
  <td>
    #
    <%= hidden_field_tag 'include_tax', pre_sale.product.include_sale_tax %>
  </td>
  <td>
    <%= pre_sale.product.sku %>
  </td>
  <td class="text-center">
    <img src="<%= pre_sale.product.small_img %>" width="100" height="100"/>
  </td>
  <td>
    <%= pre_sale.product.name %><br>
    <%= pre_sale.product.display_attributes %>
  </td>
  <td>
    <input type="number" min="1" id="quantity_<%= pre_sale.id %>" class="form-control" id="quantity_<%= pre_sale.id %>" oninput="calculatePrice($(this))" value="<%= pre_sale.quantity %>" pattern="^[0-9]*[1-9][0-9]*$" title="La cantidad debe de ser mayor o igual a 1" required>
  </td>
  <td>
    <%= pre_sale.unit_price %>
  </td>
  <td>
    <%= pre_sale.tax %>
  </td>
  <td>
    <%= pre_sale.discount %>
  </td>
  <td>
    <%= pre_sale.total %>
  </td>
  <td style="width:5%">
    <% if pre_sale.haggle == 0 %>
      <%= link_to add_sale_haggle_path(pre_sale), :remote => true, :class => "btn btn-icon-only btn-primary hagglebutton", :title=>"Agregar regate" do %> 
        <i class="fa fa-tag"></i>
      <% end %>      
    <% end %>
    <button type="button" class="btn btn-icon-only btn-danger" onclick="deleteRow($(this))"><i class="fa fa-trash-o"></i></button>    
  </td>
</tr>