remember member order when order article is deleted + test

app/controllers/finance/order_articles_controller.rb

@@ -42,6 +42,14 @@ class Finance::OrderArticlesController < ApplicationController
 
   def destroy
     @order_article = OrderArticle.find(params[:id])
-    @order_article.destroy
+    # only destroy if there are no associated GroupOrders; if we would, the requested
+    # quantity and tolerance would be gone. Instead of destroying, we set all result
+    # quantities to zero.
+    if @order_article.group_order_articles.count == 0
+      @order_article.destroy
+    else
+      @order_article.group_order_articles.each { |goa| goa.update_attribute(:result, 0) }
+      @order_article.update_results!
+    end
   end
 end

spec/integration/balancing_spec.rb

@@ -50,6 +50,32 @@ describe 'settling an order', :type => :feature do
       end
     end
 
+    it 'keeps ordered quantities when article is deleted from resulting order' do
+      within("#order_article_#{oa.id}") do
+        click_link I18n.t('ui.delete')
+        page.driver.browser.switch_to.alert.accept
+      end
+      expect(page).to_not have_selector("#order_article_#{oa.id}")
+      expect(OrderArticle.exists?(oa.id)).to be_true
+      oa.reload
+      expect(oa.quantity).to eq(4)
+      expect(oa.tolerance).to eq(0)
+      expect(oa.units_to_order).to eq(0)
+      expect(goa1.reload.result).to eq(0)
+      expect(goa2.reload.result).to eq(0)
+    end
+
+    it 'deletes an OrderArticle with no GroupOrderArticles' do
+      goa1.destroy
+      goa2.destroy
+      within("#order_article_#{oa.id}") do
+        click_link I18n.t('ui.delete')
+        page.driver.browser.switch_to.alert.accept
+      end
+      expect(page).to_not have_selector("#order_article_#{oa.id}")
+      expect(OrderArticle.exists?(oa.id)).to be_false
+    end
+
   end
 
 end