Populate tax total fields on spree_orders

db/migrate/20210125171611_populate_order_tax_totals.rb

@@ -0,0 +1,18 @@
+class PopulateOrderTaxTotals < ActiveRecord::Migration
+  def up
+    Spree::Order.where(additional_tax_total: 0, included_tax_total: 0).
+      find_each(batch_size: 500) do |order|
+
+      additional_tax_total = order.all_adjustments.tax.additional.sum(:amount)
+
+      included_tax_total = order.line_item_adjustments.tax.sum(:included_tax) +
+        order.all_adjustments.enterprise_fee.sum(:included_tax) +
+        order.adjustments.shipping.sum(:included_tax)
+
+      order.update_columns(
+        additional_tax_total: additional_tax_total,
+        included_tax_total: included_tax_total
+      )
+    end
+  end
+end