feat: filter for products using category field

app/Nova/Filters/ProductCategory.php

+<?php
+
+namespace App\Nova\Filters;
+
+use Laravel\Nova\Filters\Filter;
+use App\Models\Category;
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+class ProductCategory extends Filter
+{
+    public function apply(NovaRequest $request, $query, $value)
+    {
+        return $query->whereHas('categories', function ($query) use ($value) {
+            $query->where('category_id', $value);
+        });
+    }
+
+    public function options(NovaRequest $request)
+    {
+        $categories = Category::all();
+        return $categories->pluck('id', 'name')->all();
+    }
+}

app/Nova/Product.php

@@ -150,6 +150,7 @@ public function filters(NovaRequest $request)
     {
         return [
             new Filters\ProductPrice(),
+            new Filters\ProductCategory()
         ];
     }