add "Weight/VOL." column to the invoice

app/models/invoice/data_presenter/line_item.rb

@@ -4,7 +4,7 @@ class Invoice
   class DataPresenter
     class LineItem < Invoice::DataPresenter::Base
       attributes :added_tax, :currency, :included_tax, :price_with_adjustments, :quantity,
-                 :variant_id, :unit_price_price_and_unit
+                 :variant_id, :unit_price_price_and_unit, :unit_presentation
       attributes_with_presenter :variant
       array_attribute :tax_rates, class_name: 'TaxRate'
       invoice_generation_attributes :added_tax, :included_tax, :price_with_adjustments,

app/serializers/invoice/line_item_serializer.rb

@@ -3,7 +3,7 @@
 class Invoice
   class LineItemSerializer < ActiveModel::Serializer
     attributes :id, :added_tax, :currency, :included_tax, :price_with_adjustments, :quantity,
-               :variant_id, :unit_price_price_and_unit
+               :variant_id, :unit_price_price_and_unit, :unit_presentation
     has_one :variant, serializer: Invoice::VariantSerializer
     has_many :tax_rates, serializer: Invoice::TaxRateSerializer
   end

app/views/spree/admin/orders/_invoice_table4.html.haml

@@ -5,6 +5,8 @@
         %h5= t(:invoice_column_item)
       %th{:align => "right", :width => "15%"}
         %h5= t(:invoice_column_qty)
+      %th{:align => "right", :width => "15%"}
+        %h5= t(:invoice_column_weight_volume)
       %th{:align => "right", :width => "15%"}
         %h5= @order.has_taxes_included ? t(:invoice_column_unit_price_with_taxes) : t(:invoice_column_unit_price_without_taxes)
       - if @order.total_tax > 0
@@ -22,6 +24,8 @@
             %em= raw(item.variant.product.supplier.name)
         %td{:align => "right"}
           = item.quantity
+        %td{:align => "right"}
+          = item.unit_presentation
         %td{:align => "right"}
           = item.single_display_amount_with_adjustments
         - if @order.total_tax > 0

config/locales/en.yml

@@ -1875,6 +1875,7 @@ en:
   invoice_column_price: "Price"
   invoice_column_item: "Item"
   invoice_column_qty: "Qty"
+  invoice_column_weight_volume: "Weight / VOL."
   invoice_column_unit_price_with_taxes: "Unit price (Incl. tax)"
   invoice_column_unit_price_without_taxes: "Unit price (Excl. tax)"
   invoice_column_price_with_taxes: "Total price (Incl. tax)"