added begin, end and export filter for API timesheets (#639)

src/Form/TimesheetEditForm.php

@@ -268,11 +268,17 @@ class TimesheetEditForm extends AbstractType
         if ($options['include_rate']) {
             $builder
                 ->add('fixedRate', MoneyType::class, [
+                    'documentation' => [
+                        'type' => 'float'
+                    ],
                     'label' => 'label.fixedRate',
                     'required' => false,
                     'currency' => $currency,
                 ])
                 ->add('hourlyRate', MoneyType::class, [
+                    'documentation' => [
+                        'type' => 'float'
+                    ],
                     'label' => 'label.hourlyRate',
                     'required' => false,
                     'currency' => $currency,

src/Form/Type/DateRangeType.php

@@ -125,10 +125,19 @@ class DateRangeType extends AbstractType
         $pattern = $this->formatToPattern($formatDate, $separator);
 
         $builder->addModelTransformer(new CallbackTransformer(
-            function (DateRange $range) use ($formatDate, $separator) {
+            function ($range) use ($formatDate, $separator) {
+                if (null === $range) {
+                    return '';
+                }
+
+                if (!($range instanceof DateRange)) {
+                    throw new \InvalidArgumentException('Invalid DateRange given');
+                }
+
                 if (null === $range->getBegin()) {
                     return '';
                 }
+
                 $display = $range->getBegin()->format($formatDate);
                 if (null !== $range->getEnd()) {
                     $display .= $separator . $range->getEnd()->format($formatDate);