update to Symfony 4.4 (#1275)

src/Invoice/Calculator/AbstractCalculator.php

@@ -9,6 +9,7 @@
 
 namespace App\Invoice\Calculator;
 
+use App\Invoice\CalculatorInterface;
 use App\Invoice\InvoiceItem;
 use App\Invoice\InvoiceModel;
 
@@ -87,11 +88,17 @@ abstract class AbstractCalculator
     }
 
     /**
+     * @deprecated since 1.8 will be removed with 2.0
      * @return string
      */
     public function getCurrency(): string
     {
-        return $this->model->getCustomer()->getCurrency();
+        @trigger_error(
+            sprintf('%s::getCurrency() is deprecated and will be removed with 2.0', CalculatorInterface::class),
+            E_USER_DEPRECATED
+        );
+
+        return $this->model->getCurrency();
     }
 
     /**

src/Invoice/CalculatorInterface.php

@@ -52,6 +52,7 @@ interface CalculatorInterface
     /**
      * Returns the currency for the invoices amounts.
      *
+     * @deprecated since 1.8 will be removed with 2.0
      * @return string
      */
     public function getCurrency(): string;

src/Invoice/InvoiceModel.php

@@ -211,13 +211,23 @@ final class InvoiceModel
         return $this->formatter;
     }
 
+    public function getCurrency(): string
+    {
+        if (null === $this->getCustomer()) {
+            // this should be set from the configuration
+            return Customer::DEFAULT_CURRENCY;
+        }
+
+        return $this->getCustomer()->getCurrency();
+    }
+
     public function toArray(): array
     {
         $model = $this;
         $customer = $model->getCustomer();
         $project = $model->getQuery()->getProject();
         $activity = $model->getQuery()->getActivity();
-        $currency = $model->getCalculator()->getCurrency();
+        $currency = $this->getCurrency();
         $tax = $model->getCalculator()->getTax();
         $total = $model->getCalculator()->getTotal();
         $subtotal = $model->getCalculator()->getSubtotal();