remember what member ordered when deleted in balancing screen

app/controllers/finance/group_order_articles_controller.rb

@@ -65,7 +65,13 @@ class Finance::GroupOrderArticlesController < ApplicationController
 
   def destroy
     group_order_article = GroupOrderArticle.find(params[:id])
-    group_order_article.destroy
+    # only destroy if quantity and tolerance was zero already, so that we don't
+    # lose what the user ordered, if any
+    if group_order_article.quantity > 0 or group_order_article.tolerance >0
+      group_order_article.update_attribute(:result, 0)
+    else
+      group_order_article.destroy
+    end
     update_summaries(group_order_article)
     @order_article = group_order_article.order_article
 

spec/integration/balancing_spec.rb

@@ -76,6 +76,33 @@ describe 'settling an order', :type => :feature do
       expect(OrderArticle.exists?(oa.id)).to be_false
     end
 
+    it 'keeps ordered quantities when GroupOrderArticle is deleted from resulting order' do
+      click_link article.name
+      expect(page).to have_selector("#group_order_article_#{goa1.id}")
+      within("#group_order_article_#{goa1.id}") do
+        click_link I18n.t('ui.delete')
+      end
+      expect(page).to_not have_selector("#group_order_article_#{goa1.id}")
+      expect(OrderArticle.exists?(oa.id)).to be_true
+      expect(GroupOrderArticle.exists?(goa1.id)).to be_true
+      goa1.reload
+      expect(goa1.result).to eq(0)
+      expect(goa1.quantity).to eq(3)
+      expect(goa1.tolerance).to eq(0)
+    end
+
+    it 'deletes a GroupOrderArticle with no ordered amounts' do
+      goa1.update_attributes({:quantity => 0, :tolerance => 0})
+      click_link article.name
+      expect(page).to have_selector("#group_order_article_#{goa1.id}")
+      within("#group_order_article_#{goa1.id}") do
+        click_link I18n.t('ui.delete')
+      end
+      expect(page).to_not have_selector("#group_order_article_#{goa1.id}")
+      expect(OrderArticle.exists?(oa.id)).to be_true
+      expect(GroupOrderArticle.exists?(goa1.id)).to be_false
+    end
+
   end
 
 end