Models in components (namespaces)

I'm not sure really what you mean, how would you use a model without registering its namespace? That would make it effectively non-existent.

If you use an auto-loader, you don't need to use namespaces at all unless you want to.

//Register an autoloader
$loader = new \Phalcon\Loader();
$loader->registerDirs(array(
    __DIR__ . '/controllers/',
    __DIR__ . '/models/',
))->register();

//autoloader
$loader = new \Phalcon\Loader();
$loader->registerDirs(array(
    __DIR__ . '/controllers/',
    __DIR__ . '/models/',
))->register();

// component
$user = Users::findFirst(...);

Result is Fatal error: Class "projectname\component\Users" not found in (component dir)

In controllers models are ok.

Everything has a namespace - unless you declare it, the namespace is just \. So, if you're in a controller with a declared namespace, and you want to use a model without a declared namespace, you need to specify the root namespace:

namespace \MyProject\Controllers;

class UpdateController extends BaseController(){

    public function somethingOrOther(){

        $User = \Users::findFirst(...);
    }
}

I've got 'phalcon project simple' from devtools. How to use model in component? $user = Users::findFirst(...); is returning: Fatal error: Class "projectname\component\Users" not found in (component dir)

$user = \Users::findFirst(...); is returning:

Fatal error: Class "Users" not found in (component dir)

I've got no experience with the devtools, so I don't know how it sets things up. Can you post the config & bootstrap file - at least the parts that relate to the autoloader?

<?php

$loader = new \Phalcon\Loader();

/**
 * We're a registering a set of directories taken from the configuration file
 */
$loader->registerDirs(
    array(
        $config->application->controllersDir,
        $config->application->modelsDir
    )
);

$loader->registerNamespaces(array(
    'Lib' => $config->application->libraryDir
));

$loader->register();

Can you also please post the entirety of the component file in which you're encountering the error?

<?php
namespace Lib\Auth;

use Phalcon\Mvc\User\Component;

class Auth extends Component
{
    public function check()
    {
        $user = Users::findFirst();
    }
}

$user = \Users::findFirst(...); is ok, I just forgot to remove namespace from model, sorry and thank you very much