doctrine odm annotations or composer autoload.php not working?

Question

I'm trying to use Doctrine MongoDB ODM 2.0 beta on a project with the Yii2 framework, with composer version 1.8.4 and PHP 7.2, but I keep getting the error Fatal error: Uncaught Error: Call to a member function add() on boolean where the code runs $loader->add('Documents', __DIR__);

bootstrap.php file (in DIR/bootstrap.php):

<?php

use Doctrine\Common\Annotations\AnnotationRegistry;
use Doctrine\ODM\MongoDB\Configuration;
use Doctrine\ODM\MongoDB\DocumentManager;
use Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver;

if ( ! file_exists($file = 'C:/path/to/vendor/autoload.php')) {
    throw new RuntimeException('Install dependencies to run this script.');
}

$loader = require_once $file;
$loader->add('Documents', __DIR__);

AnnotationRegistry::registerLoader([$loader, 'loadClass']);

$config = new Configuration();
$config->setProxyDir(__DIR__ . '/Proxies');
$config->setProxyNamespace('Proxies');
$config->setHydratorDir(__DIR__ . '/Hydrators');
$config->setHydratorNamespace('Hydrators');
$config->setDefaultDB('fsa');
$config->setMetadataDriverImpl(AnnotationDriver::create(__DIR__ . '/Documents'));

$dm = DocumentManager::create(null, $config);

I already tried looking at How to properly Autoload Doctrine ODM annotations? and Laravel & Couchdb-ODM - The annotation "@Doctrine\ODM\CouchDB\Mapping\Annotations\Document" does not exist, or could not be auto-loaded and a host of other threads I can't quite recall for help, but I couldn't figure out a solution.

I also tried commenting out the lines below

if ( ! file_exists($file = 'C:/path/to/vendor/autoload.php')) {
    throw new RuntimeException('Install dependencies to run this script.');
}

$loader = require_once $file;
$loader->add('Documents', __DIR__);

AnnotationRegistry::registerLoader([$loader, 'loadClass']);

and ran composer dump-autoload and on command line it returned Generated autoload files containing 544 classes, but then I got the problem

[Semantical Error] The annotation "@Doctrine\ODM\MongoDB\Mapping\Annotations\Document" in class Documents\Message does not exist, or could not be auto-loaded.

So the annotations are not auto-loading, and I have no idea how to fix that. In the model I have:

<?php

namespace Documents;

use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
use \Doctrine\ODM\MongoDB\Mapping\Annotations\Document;

/** @ODM\Document */
class Message
{
    /** @ODM\Id */
    private $id;

    /** @ODM\Field(type="int") */
    private $sender_id;
...

I also posted a thread on github at https://github.com/doctrine/mongodb-odm/issues/1976. One commenter stated that "By default, the composer autoload file returns the autoloader in question, which seems to not be the case for you." How can I fix that? The only information I can find online is to put (inside composer.json) the lines:

    "autoload": {
        "psr-4": {
            "Class\\": "src/"
        }
    },

but then what class should I be loading?

I'm very confused and being pretty new to all these tools (mongodb, yii2, etc.) doesn't help at all. I'm not sure what other information would be helpful else I would post it.

Thanks in advance.

Answer 1

So turns out that the problem (as was mentioned in https://github.com/doctrine/mongodb-odm/issues/1976) was that autoload.php was required twice - once in bootstrap.php and once in web/index.php (of the framework). After the require line in index.php was removed, everything worked fine.