Filter resource fields by query string

Resource.php

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\Resource;

class UsersResource extends Resource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request
     * @return array
     */
    public function toArray($request)
    {
        if ($request->fields) {
            // Delegate to a separate method to keep it clean and readable.
            return $this->processRequestedFields($request->fields);
        }

        // Since we're using early-return inside the if statement, there's no need for an else.
        return parent::toArray($request);
    }


    /**
     * Filter the resource with the provided fields.
     * 
     * @param string $fields
     * @return array
     */
    protected function processRequestedFields($fields)
    {
        $attributes = $this->resource->getAttributes();

        $requestedFields = explode(',', $fields);

        return collect($attributes)->only($requestedFields);
    }
}