Non-existent data source

Hai guys,
I have got a problem while working with cakephp.This is the error

Fatal Error (256): ConnectionManager::getDataSource - Non-existent data
source $blog [CORE/cake/libs/model/connection_manager.p

context:
$name = "$blog"
$_this = ConnectionManager
ConnectionManager::$config = DATABASE_CONFIG object
ConnectionManager::$_dataSources = array
ConnectionManager::$_connectionsEnum = array

and this is my app/config/database .php file
var $blog = array(
'driver' => 'mysql',
'persistent' => false,
'host' => 'localhost',
'login' => 'root',
'password' => 'scourlet',
'database' => 'blog',
'prefix' => '',
);

and this is my blog app's model code

<?php
class Post extends AppModel {
var $useDbConfig = '$blog'; //
var $name = 'Post';
var $validate = array('title' => array(
'alphanumeric' => array(
'rule' => 'alphanumeric',
'required' => true,
'message' => 'enter a title to post',
)
),
'content' => array(
'alphanumeric' => array(
'rule' => 'alphanumeric',
'required' => true,
'message' => 'enter some content to post',
)
)
);
}
?>
Thank you,
pgredeye

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