Showing Wrong User Data CakePHP - authentication

Question

I'm simply want to show the user that is currently logged in. My code for the Auth section came from 2.x cookbook.
The issue is the following:
I have 2 users currently in the system. User A and User B. User B was created second. Instead of showing the current user, it just shows User B. I assume it is because User B was the last to be created, because if I create User C, it will show user C instead.
Here is my action:
public function index($id = null) {
$this->set('strains', $this->Strain->find('all'));
$this->loadModel('User');
$users = $this->User->find('all');
$this->set('users', $users);
$this->set('userDataName', $this->Auth->user('id'));
if($this->Auth->user()) {
$this->User->id = $id;
$user = $this->Session->write('user', $this->User->findById($id));
$this->set('user', $user);
}
}
Here is the line in my view that should show the current user:
<?php echo $user['User']['username']; ?>
I've read several stack questions, but none seem to go over this specific scenario. I'm open to completely re-writing code if necessary. Thanks

Answer 1

the simplest way to display the username of the current session user is to use the auth component:
in controller
$user = $this->Auth->user(); // returns array with user data or null
$this->set('user', $user);
in view
echo $user['username'];

Answer 2

It's a logic error
Here is the line in my view that should show the current user:
<?php echo $user['User']['username']; ?>
In the template the username is taken from the $user variable.
public function index($id = null) {
...
$this->User->id = $id;
$user = $this->Session->write('user', $this->User->findById($id));
$this->set('user', $user);
}
}
The user variable depends on the $id parameter, not directly the currently logged-in user.
How to access the logged in user data
The simplest way to access the logged in user data is to use AuthComponent::user i.e. in a template:
<?php echo AuthComponent::user('username'); ?>