BillablePeriods don't get updated when account_invoice has been finalized

app/jobs/update_billable_periods.rb

@@ -74,14 +74,17 @@ class UpdateBillablePeriods
     account_invoice = AccountInvoice.find_or_create_by_user_id_and_year_and_month(owner_id, begins_at.year, begins_at.month)
 
     billable_period = BillablePeriod.where(account_invoice_id: account_invoice.id, begins_at: begins_at, enterprise_id: enterprise.id).first
-    billable_period ||= BillablePeriod.new(account_invoice_id: account_invoice.id, begins_at: begins_at, enterprise_id: enterprise.id)
-    billable_period.update_attributes({
-      ends_at: ends_at,
-      sells: sells,
-      trial: trial,
-      owner_id: owner_id,
-      turnover: orders.sum(&:total)
-    })
+
+    unless account_invoice.order.andand.complete?
+      billable_period ||= BillablePeriod.new(account_invoice_id: account_invoice.id, begins_at: begins_at, enterprise_id: enterprise.id)
+      billable_period.update_attributes({
+        ends_at: ends_at,
+        sells: sells,
+        trial: trial,
+        owner_id: owner_id,
+        turnover: orders.sum(&:total)
+      })
+    end
 
     billable_period.touch
   end

spec/jobs/update_billable_periods_spec.rb

@@ -14,10 +14,6 @@ describe UpdateBillablePeriods do
     describe "perform", versioning: true do
       let!(:enterprise) { create(:supplier_enterprise, created_at: start_of_july - 1.month, sells: 'any') }
 
-      before do
-        allow(Enterprise).to receive(:where) { double(:enterprises, select: [enterprise]) }
-      end
-
       context "when no date arguments are passed to the job" do
         before do
           expect(updater).to receive(:clean_up_untouched_billable_periods_for).once
@@ -419,6 +415,23 @@ describe UpdateBillablePeriods do
         ]}
       end
 
+      context "when the account invoice is already_complete" do
+        before do
+          allow(BillablePeriod).to receive(:where) { [existing] }
+          allow(existing.account_invoice).to receive(:order) { double(:order, complete?: true ) }
+          allow(AccountInvoice).to receive(:find_or_create_by_user_id_and_year_and_month) { existing.account_invoice }
+        end
+
+        it "does not update the billing period, but changes updated_at by touching the billable period " do
+          expect(existing).to_not receive(:update_attributes)
+          expect(existing).to receive(:touch)
+          expect(Bugsnag).to_not receive(:notify)
+          expect{
+            updater.update_billable_period(enterprise, start_of_july, start_of_july + 20.days, false)
+          }.to_not change{ BillablePeriod.count }
+        end
+      end
+
       context "when arguments match both 'begins_at' and 'enterprise_id' of an existing billable period" do
         it "updates the existing billable period" do
           expect{