Prestashop 1.7.4 - Module error with namespace

Question

i'm studding prestashop for a futur project. I follow the documentation for create a module

https://devdocs.prestashop.com/1.7/modules/concepts/hooks/use-hooks-on-modern-pages/

But when i follow all steps i have this error :

Attempted to load class "ProductRepository" from namespace "Foo\Repository". Did you forget a "use" statement for another namespace?

my structure is that :

Module

- foo
    - config 
        services.yml
    - src
        - Repository
            ProductRepository.php
    - foo.php

my services.yml

# modules/foo/config/services.yml

services:
    product_repository:
        class: \Foo\Repository\ProductRepository
        arguments: ['@doctrine.dbal.default_connection', '%database_prefix%']

my ProductRepository.php

<?php

// src/Repository/ProductRepository.php
namespace Foo\Repository;

use Doctrine\DBAL\Connection;

class ProductRepository
{
    /**
     * @var Connection the Database connection.
     */
    private $connection;

    /**
     * @var string the Database prefix.
     */
    private $databasePrefix;

    public function __construct(Connection $connection, $databasePrefix)
    {
        $this->connection = $connection;
        $this->databasePrefix = $databasePrefix;
        dump('ok');
    }

    /**
     * @param int $langId the lang id
     * @return array the list of products
     */
    public function findAllbyLangId($langId)
    {
        $prefix = $this->databasePrefix;
        $productTable = "${prefix}product";
        $productLangTable = "${prefix}product_lang";

        $query = "SELECT p.* FROM ${productTable} p LEFT JOIN ${productLangTable} pl ON (p.`id_product` = pl.`id_product`) WHERE pl.`id_lang` = :langId";
        $statement = $this->connection->prepare($query);
        $statement->bindValue('langId', $langId);
        $statement->execute();

        return $statement->fetchAll();
    }
}

my foo.php

<?php

if (!defined('_PS_VERSION_')) {
    exit;
}

class Foo extends Module
{
    public function __construct()
    {
        $this->name = 'foo';
        $this->tab = 'front_office_features';
        $this->version = '1.0.0';
        $this->author = 'Jordan NativeWeb';
        $this->need_instance = 0;
        $this->ps_versions_compliancy = [
            'min' => '1.6',
            'max' => _PS_VERSION_
        ];
        $this->bootstrap = true;

        parent::__construct();

        $this->displayName = $this->l('Foo');
        $this->description = $this->l('2eme module');

        $this->confirmUninstall = $this->l('Etes vous sûr de vouloir supprimer ce module ?');

        if(!Configuration::get('MYMODULE_NAME')) {
            $this->warning = $this->l('Aucun nom trouvé');
        }
    }

    /**
     * Module installation.
     *
     * @return bool Success of the installation
     */
    public function install()
    {
        return parent::install() && $this->registerHook('displayDashboardToolbarIcons');
    }

    /**
     * Add an "XML export" action in Product Catalog page.
     *
     */
    public function hookDisplayDashboardToolbarIcons($hookParams)
    {
        if ($this->isSymfonyContext() && $hookParams['route'] === 'admin_product_catalog') {
            $products = $this->get('product_repository')->findAllByLangId(1);
            dump($products);
        }
    }

    public function uninstall()
    {
        if (!parent::uninstall() ||
            !Configuration::deleteByName('MYMODULE_NAME')
        ) {
            return false;
        }

        return true;
    }

}

Do you see something who is bad and can explain the error ? I try but i don't find anything... I thank you by advance

Answer 1

For solve this problem you must to use autoload and composer.

Composer:

Install composer if you don't have https://getcomposer.org/

Create composer.json

Create inside the module's folder the file named composer.json and insert the below code

{
  "autoload": {
    "psr-4": {
      "Carbo\\": "classes/"
    }
  }
}

in this case carbo is my name space and classes is the folder where I will create my classes

Use terminal

open your terminal and go to your module folder and lunch this command:

php composer.phar dump-autoload -a

This will generate a vendor folder, with inside composer folder and autoload.php file.

in autoload_psr4.php inside the composer folder

<?php

// autoload_psr4.php @generated by Composer

$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);

return array(
    'Carbo\\' => array($baseDir . '/classes'),
);

How to use in app

Create your class in: classes/Helper/Display.php

<?php

namespace Carbo\Helper;

class Display
{
    public static function hello($string){
        return $string;
    }
}

• namespace: Carbo
• Folder: Helper
• Class Name: Display

open your main file and include autoload.php before the class declaration

require_once __DIR__.'/vendor/autoload.php';

now you can include your classes

use Carbo\Helper\Display; // Namespace - folder - class name

And finally use it

Display::hello("Hello there")

For more about this, you can follow this tutorial: https://thewebtier.com/php/psr4-autoloading-php-files-using-composer/

I hope will be useful for you