NilPortugues\Api\Mappings\ApiMapping::getRequiredProperties Error

[alochym01]

i follow the guide on github, and when i run php artisan route:list, i get the errors

PHP Fatal error: Class App\Model\Api\EmployeesTransformer contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (NilPortugues\Api\Mappings\ApiMapping::getRequiredProperties) in /home/hadn/Laravel/learning_bootstrap_v4/laravel/app/Model/Api/EmployeesTransformer.php on line 102

[Symfony\Component\Debug\Exception\FatalErrorException]
Class App\Model\Api\EmployeesTransformer contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (NilPortugues\Api\Mappings\ApiMapping::getRequiredProperties)

thi is my EmployeesTranformer:

<?php namespace App\Model\Api;

use App\Model\Database\Employees;
use NilPortugues\Api\Mappings\JsonApiMapping;

class EmployeesTransformer implements JsonApiMapping
{
    /**
     * Returns a string with the full class name, including namespace.
     *
     * @return string
     */
    public function getClass()
    {
        return Employees::class;
    }

    /**
     * Returns a string representing the resource name
     * as it will be shown after the mapping.
     *
     * @return string
     */
    public function getAlias()
    {
        return 'employee';
    }

    /**
     * Returns an array of properties that will be renamed.
     * Key is current property from the class.
     * Value is the property's alias name.
     *
     * @return array
     */
    public function getAliasedProperties()
    {
        return [
            'last_name' => 'surname',

        ];
    }

    /**
     * List of properties in the class that will be  ignored by the mapping.
     *
     * @return array
     */
    public function getHideProperties()
    {
        return [
            'attachments'
        ];
    }

    /**
     * Returns an array of properties that are used as an ID value.
     *
     * @return array
     */
    public function getIdProperties()
    {
        return ['id'];
    }

    /**
     * Returns a list of URLs. This urls must have placeholders
     * to be replaced with the getIdProperties() values.
     *
     * @return array
     */
    public function getUrls()
    {
        return [
            'self' => ['name' => 'employees.show', 'as_id' => 'id'],
            'employees' => ['name' => 'employees.index'],
            'employee_orders' => ['name' => 'employees.orders', 'as_id' => 'id']
        ];
    }

    /**
     * Returns an array containing the relationship mappings as an array.
     * Key for each relationship defined must match a property of the mapped class.
     *
     * @return array
     */
    public function getRelationships()
    {
        return [];
    }
}

my package:
[hadn@rad-hadn4 laravel]$ cat composer.json
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
"php": ">=5.5.9",
"laravel/framework": "5.2.*",
"doctrine/dbal": "^2.5",
"nilportugues/laravel5-json-api": "^2.4"
},

[Nil Portugués Calderó]

I'm sorry, this is a bug in the documentation.

Add the following piece to your code:

  /**
     * {@inheritdoc}
     */
    public function getRequiredProperties()
    {
        return [];
    }

[Victor Ferreira]

Please, update the documentation