first upload all files

Modules/Attribute/Http/Controllers/Admin/AttributeController.php

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+<?php
+
+namespace Modules\Attribute\Http\Controllers\Admin;
+
+use Modules\Admin\Traits\HasCrudActions;
+use Modules\Attribute\Entities\Attribute;
+use Modules\Attribute\Http\Requests\SaveAttributeRequest;
+
+class AttributeController
+{
+    use HasCrudActions;
+
+    /**
+     * Model for the resource.
+     *
+     * @var string
+     */
+    protected $model = Attribute::class;
+
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['values'];
+
+    /**
+     * Label of the resource.
+     *
+     * @var string
+     */
+    protected $label = 'attribute::admin.attribute';
+
+    /**
+     * View path of the resource.
+     *
+     * @var string
+     */
+    protected $viewPath = 'attribute::admin.attributes';
+
+    /**
+     * Form requests for the resource.
+     *
+     * @var array
+     */
+    protected $validation = SaveAttributeRequest::class;
+}

Modules/Attribute/Http/Controllers/Admin/AttributeSetController.php

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+<?php
+
+namespace Modules\Attribute\Http\Controllers\Admin;
+
+use Modules\Admin\Traits\HasCrudActions;
+use Modules\Attribute\Entities\AttributeSet;
+use Modules\Attribute\Http\Requests\SaveAttributeSetRequest;
+
+class AttributeSetController
+{
+    use HasCrudActions;
+
+    /**
+     * Model for the resource.
+     *
+     * @var string
+     */
+    protected $model = AttributeSet::class;
+
+    /**
+     * Label of the resource.
+     *
+     * @var string
+     */
+    protected $label = 'attribute::attribute_sets.attribute_set';
+
+    /**
+     * View path of the resource.
+     *
+     * @var string
+     */
+    protected $viewPath = 'attribute::admin.attribute_sets';
+
+    /**
+     * Form requests for the resource.
+     *
+     * @var array
+     */
+    protected $validation = SaveAttributeSetRequest::class;
+}

Modules/Attribute/Http/Requests/SaveAttributeRequest.php

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+<?php
+
+namespace Modules\Attribute\Http\Requests;
+
+use Illuminate\Validation\Rule;
+use Modules\Core\Http\Requests\Request;
+use Modules\Attribute\Entities\Attribute;
+
+class SaveAttributeRequest extends Request
+{
+    /**
+     * Available attributes.
+     *
+     * @var string
+     */
+    protected $availableAttributes = 'attribute::attributes.attributes';
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'attribute_set_id' => ['required', Rule::exists('attribute_sets', 'id')],
+            'name' => 'required',
+            'slug' => $this->getSlugRules(),
+            'is_filterable' => 'required|boolean',
+        ];
+    }
+
+    private function getSlugRules()
+    {
+        $rules = $this->route()->getName() === 'admin.attributes.update'
+            ? ['required']
+            : ['sometimes'];
+
+        $slug = Attribute::where('id', $this->id)->value('slug');
+
+        $rules[] = Rule::unique('attributes', 'slug')->ignore($slug, 'slug');
+
+        return $rules;
+    }
+
+    /**
+     * Get data to be validated from the request.
+     *
+     * @return array
+     */
+    public function validationData()
+    {
+        return request()->merge([
+            'values' => $this->filter($this->values ?? []),
+        ])->all();
+    }
+
+    /**
+     * Filter attribute values.
+     *
+     * @param array $values
+     * @return array
+     */
+    private function filter($values = [])
+    {
+        return array_filter($values, function ($value) {
+            return ! is_null($value['value']);
+        });
+    }
+}

Modules/Attribute/Http/Requests/SaveAttributeSetRequest.php

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+<?php
+
+namespace Modules\Attribute\Http\Requests;
+
+use Modules\Core\Http\Requests\Request;
+
+class SaveAttributeSetRequest extends Request
+{
+    /**
+     * Available attributes.
+     *
+     * @var string
+     */
+    protected $availableAttributes = 'attribute::attributes.attribute_sets';
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'name' => 'required',
+        ];
+    }
+}

Modules/Attribute/Http/Requests/SaveProductAttributesRequest.php

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+<?php
+
+namespace Modules\Attribute\Http\Requests;
+
+use Illuminate\Validation\Rule;
+use Modules\Core\Http\Requests\Request;
+
+class SaveProductAttributesRequest extends Request
+{
+    /**
+     * Available attributes.
+     *
+     * @var string
+     */
+    protected $availableAttributes = 'attribute::attributes.product_attributes';
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'attributes.*.attribute_id' => ['required_with:attributes.*.values', Rule::exists('attributes', 'id')],
+            'attributes.*.values' => ['required_with:attributes.*.attribute_id', Rule::exists('attribute_values', 'id')],
+        ];
+    }
+
+    /**
+     * Get data to be validated from the request.
+     *
+     * @return array
+     */
+    public function validationData()
+    {
+        if (empty($this->except('attributes'))) {
+            return request()->all();
+        }
+
+        return request()->merge([
+            'attributes' => $this->filter($this->get('attributes', [])),
+        ])->all();
+    }
+
+    /**
+     * Filter product attributes.
+     *
+     * @param array $attributes
+     * @return array
+     */
+    private function filter($attributes = [])
+    {
+        return array_filter($attributes, function ($attribute) {
+            return ! is_null($attribute['attribute_id']);
+        });
+    }
+}