Added NULL/empty value casting

Author: toonvandenbos

src/Casts/TimezonedDatetime.php

@@ -37,6 +37,10 @@ public function __construct(?string $format = null)
      */
     public function get($model, $key, $value, $attributes)
     {
+        if(! $value) {
+            return null;
+        }
+        
         $original = Timezone::store($value, fn($raw, $tz) => $this->asDateTime($raw, $tz, $model));
 
         return Timezone::date($original);
@@ -53,6 +57,10 @@ public function get($model, $key, $value, $attributes)
      */
     public function set($model, $key, $value, $attributes)
     {
+        if(! $value) {
+            return null;
+        }
+
         $requested = Timezone::date($value, fn($raw, $tz) => $this->asDateTime($raw, $tz, $model));
 
         return Timezone::store($requested)->format($this->format ?? $model->getDateFormat());

tests/CastTest.php

@@ -28,6 +28,30 @@
     expect($output->format('Y-m-d H:i:s'))->toBe('2022-12-15 10:00:00');
 });
 
+it('can access NULL date as NULL', function() {
+    setupFacade();
+
+    $cast = new TimezonedDatetime();
+
+    $input = null;
+
+    $output = $cast->get(fakeModel(), 'id', $input, []);
+
+    expect($output)->toBeNull();
+});
+
+it('can access empty string as NULL', function() {
+    setupFacade();
+
+    $cast = new TimezonedDatetime();
+
+    $input = '';
+
+    $output = $cast->get(fakeModel(), 'id', $input, []);
+
+    expect($output)->toBeNull();
+});
+
 it('can mutate application timezone datetime string to UTC database date string', function() {
     setupFacade();
 
@@ -74,4 +98,28 @@
     $output = $cast->set(fakeModel(), 'id', $input, []);
 
     expect($output)->toBe('2022-12-15 09:00:00');
+});
+
+it('can mutate NULL as NULL', function() {
+    setupFacade();
+
+    $cast = new TimezonedDatetime();
+
+    $input = null;
+
+    $output = $cast->set(fakeModel(), 'id', $input, []);
+
+    expect($output)->toBeNull();
+});
+
+it('can mutate empty string as NULL', function() {
+    setupFacade();
+
+    $cast = new TimezonedDatetime();
+
+    $input = '';
+
+    $output = $cast->set(fakeModel(), 'id', $input, []);
+
+    expect($output)->toBeNull();
 });