Example syntax for validating multi-record forms

PostController.php

<?php

class ProductController {
  
  /**
   * Store a new product that belongs to multiple categories.
   *
   * @param  Request  $request
   * @return Response
   */
  public function store(Request $request)
  {
      $this->validate($request, [
          'name' => 'required|unique:products|max:255',
          'description' => 'required',
          'category.*.id' => 'exists:categories'
      ]);
  
      // The product is valid, store in database...
  }
  
}