Can't load custom extension class

It appears that you can no longer load customer extension classes from XML files, like this:

    <source_model>Inchoo\Stripe\Model\Source\Cctype</source_model>

Error is:
Class Inchoo\Stripe\Model\Source\Cctype does not exist

For example, In a custom extension, etc/adminhtml/system.xml there are a few lines like this:

            <field id="cctypes" translate="label" type="multiselect" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="0">
                <label>Credit Card Types</label>
                <source_model>Inchoo\Stripe\Model\Source\Cctype</source_model>
            </field>

(File exists, in /app/code/Inchoo/Stripe/Model/Source/Cctype.php, namespace and class name are OK)

See
https://github.com/ivanweiler/Inchoo_Stripe

It used to work in an earlier Magento2 build... what changed?

[antonkril]

The error message proves that magento tries to load your class, but it can't find it. So System config works correctly and problem is with class path. Did you try running composer install?

I tried re-running composer install in the root. But no help. Do you need to preload custom extensions somehow? Or define your models somewhere? It definitely worked in an earlier version of Magento2, I can't see what changed.

/app/code/Inchoo/Stripe/Model/Source/Cctype.php

namespace Inchoo\Stripe\Model\Source;
class Cctype extends \Magento\Payment\Model\Source\Cctype
{
    // etc
}

https://github.com/Inchoo/magento2-Inchoo_Stripe

It does work if I move the module to the app/code/Mage location, rename everything and call

<source_model>Mage\Stripe\Model\Source\Cctype</source_model>

It's as if custom extension classes can't be found.

[buskamuza]

@morningtime , you're right in your investigation.
Looks like a bug in new autoloader implementation - it doesn't include app/code in include path (comparing to previous implementation). I'll pass it to the team working on autoloder to investigate it deeper.
Thanks for the report.

[dsikkema]

@morningtime we are working on a fix that will require no code changes on your part. A solution in the meantime, and also for a little performance gain, you can add your module to composer.json's autoload section. In your example, you would go to composer.json -> autoload -> psr-4, and add

"Inchoo" : "app/code/Inchoo/"

According to the composer format:
https://getcomposer.org/doc/01-basic-usage.md#autoloading

EDIT: It is recommended to add this information to the composer.json file when using 3rd party modules.

[antonmakarenko]

@morningtime

I think an ideal solution is to adapt your extension to Magento 2 + Composer. If your package had a composer.json file with proper autoload section, there would be no need for workaround.

But in order for such a package to be recognized by Magento 2 installer and properly moved to app/code directory, it needs to define type "magento2-module". See examples at http://packages.magento.com/#!/magento/module-

Ok, if add the line to the root composer.json, it works:

"autoload": {
    "psr-4": {
        "Magento\\Framework\\": "lib/internal/Magento/Framework/",
        "Inchoo\\": "app/code/Inchoo/"
    }
},

But when I try a composer.json file in the app/code/Inchoo/Stripe/composer.json location, it doesn't work. Here's what I tried:

{
    "name": "inchoo/module-stripe",
    "description": "N/A",
    "require": {
        "php": "~5.4.11|~5.5.0",
        "magento/module-sales": "0.1.0-alpha105",
        "magento/module-payment": "0.1.0-alpha105",
        "magento/framework": "0.1.0-alpha105",
        "magento/magento-composer-installer": "*"
    },
    "autoload": {
        "psr-4": {
            "Inchoo\\": "../../app/code/Inchoo/"
        }
    },
    "type": "magento2-module",
    "version": "0.1.0-alpha105",
    "extra": {
        "map": [
            ["*", "Inchoo/Stripe"]
        ]
    }
}

[antonmakarenko]

With the Composer approach, it works in different way. You don't have the source code in app/code in the first place. Instead, you would declare in your root composer.json in "require" section something like this:

"require": {
    "inchoo/stripe": "*",
    ...
}

Then if you run composer install or composer update from root of your project, it would download the package and automatically integrate autoload.

But it takes a lot of work to do -- this extension needs to be properly packaged and registered on a packaging server (for example, packagist.org)

[buskamuza]

@morningtime , please, use solution with root composer.json until we solve this issue.
Unfortunately, second solution is not supported now by Composer Installer.

Thank you very much. I think we need some way to add third party extensions flexibly.

[orlangur]

To repair the old-school include_path based autoloading approach, corresponding section could be added to composer.json:

"include-path": [
    "app/code"
]

It is a deprecated feature of a Composer which is not going to be removed though.

But in order for such a package to be recognized by Magento 2 installer and properly moved to app/code directory, it needs to define type "magento2-module".

Instead of this modules' source code could reside in vendor folder and only some configuration files copied to app/code.

But it takes a lot of work to do -- this extension needs to be properly packaged and registered on a packaging server (for example, packagist.org)

Not really, you can simply load package from a git repository.

we need some way to add third party extensions flexibly

There could be more than one way to add extension, so would be nice to have some appropriate workflow described covering a couple of use cases:

• develop new extension
• add existing extension