support multiple invoice repositories (#1084)

src/Invoice/Calculator/UserInvoiceCalculator.php

@@ -9,21 +9,21 @@
 
 namespace App\Invoice\Calculator;
 
-use App\Entity\Timesheet;
 use App\Invoice\CalculatorInterface;
+use App\Invoice\InvoiceItemInterface;
 
 /**
- * A calculator that sums up the timesheet records by user.
+ * A calculator that sums up the invoice item records by user.
  */
 class UserInvoiceCalculator extends AbstractSumInvoiceCalculator implements CalculatorInterface
 {
-    protected function calculateSumIdentifier(Timesheet $timesheet): string
+    protected function calculateSumIdentifier(InvoiceItemInterface $invoiceItem): string
     {
-        if (null === $timesheet->getUser()->getId()) {
+        if (null === $invoiceItem->getUser()->getId()) {
             throw new \Exception('Cannot handle un-persisted user');
         }
 
-        return (string) $timesheet->getUser()->getId();
+        return (string) $invoiceItem->getUser()->getId();
     }
 
     /**