feat: add pivot data

src/SelectTree.php

@@ -18,6 +18,7 @@
 use Filament\Support\Facades\FilamentIcon;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
 
 class SelectTree extends Field implements HasAffixActions
@@ -103,16 +104,19 @@ protected function setUp(): void
             // Check if the component's relationship is a BelongsToMany relationship.
             if ($component->getRelationship() instanceof BelongsToMany) {
                 // Wrap the state in a collection and convert it to an array if it's not set.
-                $state = Collection::wrap($state ?? []);
+                $state = Arr::wrap($state ?? []);
 
-                if($pivotData = $component->getPivotData()) {
-                    $component->getRelationship()->syncWithPivotValues($state->toArray(), $pivotData);
-
+                $pivotData = $component->getPivotData();
+
+                // Sync the relationship with the provided state (IDs).
+                if ($pivotData === []) {
+                    $component->getRelationship()->sync($state ?? []);
+
                     return;
                 }
 
-                // Sync the relationship with the provided state (IDs).
-                $component->getRelationship()->sync($state->toArray());
+                // Sync the relationship with the provided state (IDs) plus pivot data.
+                $component->getRelationship()->syncWithPivotValues($state ?? [], $pivotData);
             }
         });