[8.x] Add sort direction option for HasManyFieldtype (#795)

Co-authored-by: Duncan McClean <duncan@duncanmcclean.com>

Author: Skullsneeze

src/Fieldtypes/HasManyFieldtype.php

@@ -37,6 +37,20 @@ protected function configFieldItems(): array
                     'reorderable' => true,
                 ],
             ],
+            'order_direction' => [
+                'display' => __('Order Direction'),
+                'instructions' => __('Which direction should the items be sorted in?'),
+                'type' => 'select',
+                'width' => 50,
+                'default' => 'asc',
+                'options' => [
+                    'asc' => __('Ascending'),
+                    'desc' => __('Descending'),
+                ],
+                'if' => [
+                    'reorderable' => true,
+                ],
+            ],
         ];
 
         return array_merge(parent::configFieldItems(), $config);

src/Http/Controllers/CP/Traits/PreparesModels.php

@@ -82,10 +82,11 @@ protected function prepareModelForPublishForm(Resource $resource, Model $model):
                     // When re-ordering is enabled, ensure the models are returned in the correct order.
                     if ($field->get('reorderable', false)) {
                         $orderColumn = $field->get('order_column');
+                        $orderDirection = $field->get('order_direction', 'asc');
                         $relationshipName = $resource->eloquentRelationships()->get($field->handle());
 
                         $value = $model->{$relationshipName}()
-                            ->reorder($orderColumn, 'ASC')
+                            ->reorder($orderColumn, $orderDirection)
                             ->get();
                     }
                 }