Confusion with $this->data and $this->alias as used in this function...

Hello,

I'm following this tutorial on the Auth component: http://bit.ly/aNWz3J

I'm confused about three things and I can't figure it out on my own (trust me I tried). 

Class User extends AppModel {

// ......

function password_match($data, $password_field, $hashed=true) {

    $password = $this->data[$this->alias][$password_field];

    $keys = array_keys($data);

    $password_confirm = $hashed ?

    Security::hash($data[$keys[0]], null, true) :

    $data[$keys[0]];

    return $password === $password_confirm

}

}

Confusion #1: $data

It's my understanding that $data is a property of class Controller and it contains data which has been posted to the controller user HtmlHelper and that data here is accessible using the $this->data['ModelName']['fieldName'] format. 

So why is it many times (in parameter list and in function body) that it's put out there simply as "$data"?

Confusion #2: $this->alias

What is $this->alias

Confusion #3: Where is the matching?

I don't see any matching.

Hope you guys can help. Thank you so much.

Jon Lyles

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