first upload all files

Modules/Product/Http/Requests/SaveProductRequest.php

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+<?php
+
+namespace Modules\Product\Http\Requests;
+
+use Illuminate\Validation\Rule;
+use Modules\Product\Entities\Product;
+use Modules\Core\Http\Requests\Request;
+
+class SaveProductRequest extends Request
+{
+    /**
+     * Available attributes.
+     *
+     * @var string
+     */
+    protected $availableAttributes = 'product::attributes';
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'slug' => $this->getSlugRules(),
+            'name' => 'required',
+            'description' => 'required',
+            'brand_id' => ['nullable', Rule::exists('brands', 'id')],
+            'tax_class_id' => ['nullable', Rule::exists('tax_classes', 'id')],
+            'is_virtual' => 'required|boolean',
+            'is_active' => 'required|boolean',
+            'price' => 'required|numeric|min:0|max:99999999999999',
+            'special_price' => 'nullable|numeric|min:0|max:99999999999999',
+            'special_price_type' => ['nullable', Rule::in(['fixed', 'percent'])],
+            'special_price_start' => 'nullable|date',
+            'special_price_end' => 'nullable|date',
+            'manage_stock' => 'required|boolean',
+            'qty' => 'required_if:manage_stock,1|nullable|numeric',
+            'in_stock' => 'required|boolean',
+            'new_from' => 'nullable|date',
+            'new_to' => 'nullable|date',
+        ];
+    }
+
+    private function getSlugRules()
+    {
+        $rules = $this->route()->getName() === 'admin.products.update' ? ['required'] : ['sometimes'];
+
+        $slug = Product::withoutGlobalScope('active')
+            ->where('id', $this->id)
+            ->value('slug');
+
+        $rules[] = Rule::unique('products', 'slug')->ignore($slug, 'slug');
+
+        return $rules;
+    }
+}