star-erp/app/Modules/Inventory/Controllers/CategoryController.php

<?php

namespace App\Modules\Inventory\Controllers;

use App\Http\Controllers\Controller;

use App\Modules\Inventory\Models\Category;
use Illuminate\Http\Request;

class CategoryController extends Controller
{
    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255|unique:categories,name',
        ]);

        Category::create([
            'name' => $validated['name'],
            'is_active' => true,
        ]);

        return redirect()->back()->with('success', '分類已建立');
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, Category $category)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255|unique:categories,name,' . $category->id,
        ]);

        $category->update($validated);

        return redirect()->back()->with('success', '分類已更新');
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(Category $category)
    {
        if ($category->products()->count() > 0) {
            return redirect()->back()->with('error', '該分類下尚有商品，無法刪除');
        }

        $category->delete();

        return redirect()->back()->with('success', '分類已刪除');
    }
}