workaround receive error with many articles

app/controllers/orders_controller.rb

@@ -145,7 +145,9 @@ class OrdersController < ApplicationController
     #   changed, rest_to_tolerance, rest_to_stock, left_over
     counts = [0] * 4
     cunits = [0] * 4
-    OrderArticle.transaction do
+    # This was once wrapped in a transaction, but caused
+    # "MySQL lock timeout exceeded" errors. It's ok to do
+    # this article-by-article anway.
     params[:order_articles].each do |oa_id, oa_params|
       unless oa_params.blank?
         oa = OrderArticle.find(oa_id)
@@ -163,7 +165,6 @@ class OrdersController < ApplicationController
         oa.save!
       end
     end
-    end
     return nil if counts[0] == 0
     notice = []
     notice << I18n.t('orders.update_order_amounts.msg1', count: counts[0], units: cunits[0])