Migrations for new received order state (s. #779)

db/migrate/20210205090257_introduce_received_state_in_orders.rb

@@ -0,0 +1,11 @@
+class IntroduceReceivedStateInOrders < ActiveRecord::Migration[5.2]
+  def up
+    Order.where(state: 'finished').each do |order|
+      order.update_attribute(:state, 'received') if order.order_articles.where('units_received IS NOT NULL').any?
+    end
+  end
+
+  def down
+    Order.where(state: 'received').update_all(state: 'finished')
+  end
+end