Warenwirtschaft: OPT-2 Settings-CRUD-Basisklasse

- Abstrakte SettingCrudController-Basis für die kleinen Stammdaten-CRUDs
- TaxRate/DeliveryTime/DisposalReason/MaterialQuality/Location/SupplierCategory/PackagingMaterial auf ~25-Zeilen-Konfiguration reduziert
- Identische Update*Request-Klassen entfernt (Update nutzt Store-Request, via updateRequestClass() überschreibbar)
- Bilanz -441/+73 Zeilen; Grundlage für die Lagerort-CRUDs in AP-21

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/Http/Controllers/Admin/Inventory/SettingCrudController.php

@@ -0,0 +1,139 @@
+<?php
+
+namespace App\Http\Controllers\Admin\Inventory;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Contracts\View\View;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Http\RedirectResponse;
+
+/**
+ * Gemeinsame Basis der kleinen Stammdaten-CRUDs (Warenwirtschaft → Einstellungen).
+ * Kind-Controller definieren nur Model, View-Prefix, FormRequest und Redirect-Ziel.
+ */
+abstract class SettingCrudController extends Controller
+{
+    /** @return class-string<Model> */
+    abstract protected function modelClass(): string;
+
+    /** View-Prefix, z. B. 'admin.inventory.tax-rates' (erwartet .index/.form darunter). */
+    abstract protected function viewPrefix(): string;
+
+    /** Ziel-Route nach store/update/destroy. */
+    abstract protected function redirectRoute(): string;
+
+    /** @return class-string<FormRequest> */
+    abstract protected function storeRequestClass(): string;
+
+    /** @return class-string<FormRequest> Default: identisch zum Store-Request. */
+    protected function updateRequestClass(): string
+    {
+        return $this->storeRequestClass();
+    }
+
+    /**
+     * Vorbelegung des leeren Models im Neu-Formular.
+     *
+     * @return array<string, mixed>
+     */
+    protected function newModelAttributes(): array
+    {
+        return ['active' => true, 'pos' => 0];
+    }
+
+    /**
+     * Sortierung der Index-Liste (nur für Resources mit index-Route relevant).
+     *
+     * @return array<int, string>
+     */
+    protected function indexOrder(): array
+    {
+        return ['pos', 'name'];
+    }
+
+    public function index(): View
+    {
+        $query = $this->modelClass()::query();
+        foreach ($this->indexOrder() as $column) {
+            $query->orderBy($column);
+        }
+
+        return view($this->viewPrefix().'.index', [
+            'values' => $query->get(),
+        ]);
+    }
+
+    public function create(): View
+    {
+        $class = $this->modelClass();
+
+        return view($this->viewPrefix().'.form', [
+            'model' => new $class($this->newModelAttributes()),
+        ]);
+    }
+
+    public function store(): RedirectResponse
+    {
+        $this->modelClass()::create($this->validated($this->storeRequestClass()));
+
+        \Session::flash('alert-save', '1');
+
+        return redirect()->route($this->redirectRoute());
+    }
+
+    public function edit(): View
+    {
+        return view($this->viewPrefix().'.form', [
+            'model' => $this->routeModel(),
+        ]);
+    }
+
+    public function update(): RedirectResponse
+    {
+        $this->routeModel()->update($this->validated($this->updateRequestClass()));
+
+        \Session::flash('alert-save', '1');
+
+        return redirect()->route($this->redirectRoute());
+    }
+
+    public function destroy(): RedirectResponse
+    {
+        $this->routeModel()->delete();
+
+        \Session::flash('alert-success', __('Eintrag gelöscht'));
+
+        return redirect()->route($this->redirectRoute());
+    }
+
+    /**
+     * Validiert den aktuellen Request über den angegebenen FormRequest
+     * (Container-Auflösung triggert die Validierung wie bei Method-Injection).
+     *
+     * @param  class-string<FormRequest>  $requestClass
+     * @return array<string, mixed>
+     */
+    protected function validated(string $requestClass): array
+    {
+        /** @var FormRequest $request */
+        $request = app($requestClass);
+
+        return $request->validated();
+    }
+
+    /**
+     * Löst das Model aus dem Resource-Routen-Parameter auf (ohne Typehint
+     * greift kein implizites Binding, der Parameter ist die rohe ID).
+     */
+    protected function routeModel(): Model
+    {
+        $value = array_values(request()->route()->parameters())[0] ?? null;
+
+        if ($value instanceof Model) {
+            return $value;
+        }
+
+        return $this->modelClass()::query()->findOrFail($value);
+    }
+}