Namespace with alias on Yii2 different from directory structure - namespaces

Question

I made a bunch of classes and put them inside the directory common/a/b/c.
So, inside file
Class1.class.php
I have:
<?php
namespace x\y\b\c;
class Class1
...
Namespace is different from the directory structure organization, because I wanted that way. (x\y should map to common/a directory)
On my common/config/bootstrap.php I tried this:
Yii::setAlias('common', dirname(__DIR__));
Yii::setAlias('x/y', '#common/a');
And tried importing this class in another file using
use x\y\b\c\Class1;
With no success. But if I use:
Yii::$classMap['x\y\b\c\Class1'] = __DIR__ . '/../../common/a/b/c/Class1.class.php';
instead of setAlias, it works.
I wonder if it's possible to have namespace different from the directory structure without using composer and how can I do this instead of mapping every class inside common/a/b/c

Answer 1

In bootstrap.php.
Yii::setAlias('common', dirname(__DIR__));
Yii::setAlias('x/y', dirname(__DIR__).'/models');
Inside my "models" folder, there is folder "b" and folder "c" is inside folder "b".
models > b > c
I have a model file named "LoginForm.php" and resides in folder "c".
At the top of this file are these few lines.
namespace x\y\b\c;
use Yii;
use yii\base\Model;
class LoginForm extends Model
Inside my SiteController I have this.
use x\y\b\c\LoginForm;
In one of the action function, i can successfully call this model.
$model = new LoginForm();