Merge pull request #18 from OnrampLab/16-fix-not-require-field-cant-store-with-null-value

when value set to null should delete custom field value record

Author: FishChen1202

src/Concerns/Customizable.php

@@ -100,14 +100,15 @@ public function saveCustomFieldValues(): void
         $customFields->each(function ($customField) use ($validatedCustomFieldValues) {
             if (array_key_exists($customField->key, $validatedCustomFieldValues)) {
                 $value = $validatedCustomFieldValues[$customField->key];
-                if (is_null($value)) {
-                    return;
-                }
                 $constraints = [
                     'custom_field_id' => $customField->id,
                     'customizable_type' => $this->getMorphClass(),
                     'customizable_id' => $this->id
                 ];
+                if (is_null($value)) {
+                    CustomFieldValue::where($constraints)->delete();
+                    return;
+                }
                 $values = ['value' => $value];
                 CustomFieldValue::updateOrCreate($constraints, $values);
             }