optimizations

app/Http/Requests/Collections/CollectionTargetActionRequest.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Requests\Collections;
+
+use App\Models\Collection;
+use Illuminate\Foundation\Http\FormRequest;
+
+class CollectionTargetActionRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return $this->user() !== null;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'target_collection_id' => ['required', 'integer', 'exists:collections,id'],
+        ];
+    }
+
+    public function withValidator($validator): void
+    {
+        $validator->after(function ($validator): void {
+            $targetCollectionId = (int) $this->input('target_collection_id');
+            $collection = $this->route('collection');
+
+            if ($collection instanceof Collection && $targetCollectionId === (int) $collection->id) {
+                $validator->errors()->add('target_collection_id', 'Choose a different target collection.');
+            }
+        });
+    }
+}