Slim3 PSR-4 autoloader - php

Question

I am writing Slim3 API, for some reason slim is not loading namespace defined in composer.
Here is the project structure.
FolderStruc:
projectApi
- composer.json
- src
- public
- index.php
- ProjectName
- Api
- Controllers
- Entities
- Commands
My composer file packages and PSR-4 autoloader settings.
composer.json
{
"require": {
"slim/slim": "^3.0",
"symfony/yaml": "3.1",
"symfony/console": "3.1",
"symfony/process": "3.1",
"doctrine/orm": "^2.5",
"doctrine/doctrine-bundle": "^1.6",
"doctrine/doctrine-cache-bundle": "^1.2",
"sabre/xml": "1.1.0",
"php-di/php-di": "#dev",
"php-amqplib/php-amqplib": "#dev",
"ramsey/uuid": "dev-master",
"monolog/monolog": "~1.15#dev",
"predis/predis": "~1.0.1",
"spipu/html2pdf": "^4.5",
"iio/libmergepdf": "~3.0"
},
"minimum-stability": "dev",
"autoload": {
"psr-4": {
"src\\ProjectName\\": "src/ProjectName/"
}
},
"autoload-dev": {
"psr-4": { "src\\ProjectName\\Tests\\": "tests" }
}
}
index.php
CategoryController
namespace ProjectName\Api\Controllers;
class CategoryController
{
/**
* #param \Slim\App $app
* #return array
*/
public function index(\Slim\App $app)
{
return ['Cats', 'Cats2', 'Cats3'];
}
}
** routes.php **
$app->get('/v1/category/list', function (Request $request, Response $response) {
$response = $response->withHeader('Content-type', 'application/json');
$categoryCtrl = new \ProjectName\Api\Controllers\CategoryController();
});
Slim fails to load namespace \ProjectName\Api\Controllers\CategoryController
any idea where and what is going wrong?
Best Regards
Danyal

Answer 1

You have incorrect autoloader definitions in your composer.json file.
The pattern is:
"psr-4": {
"Namespace\\Prefix\\": "/path/to/source/root"
}
So in your case it probably should be:
"autoload": {
"psr-4": {
"ProjectName\\": "src/ProjectName/"
}
},
"autoload-dev": {
"psr-4": { "ProjectName\\Tests\\": "tests/" }
}
autoload-dev definition is assuming there's a tests directory under project root path, which is not mentioned in your question.