Calling an associated model function

I have two tables, Pages and Posts that are in HABTM and are joined
using pages_posts join table.

My Page model along with the HABTM definition contains a function..

class Page extends AppModel
{
var $name = "Page";
......
......
function callthis()
{
return $this->find('all');;
}
}

From my Posts controller, I'm trying to call that function..

class PostsController extends AppController
{
....
....
function index()
{
$returned = $this->Post->Page->callthis();
}
}

This results in

Warning (512): SQL Error: 1064: You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version for the
right syntax to use near 'threadedpages' at line 1 [CORE/cake/libs/
model/datasources/dbo_source.php, line 681]

Further Debug output:

Code

$out = null;
if ($error) {
trigger_error('<span style="color:Red;text-
align:left"><b>' . __('SQL Error:', true) . "</b> {$this->error}</
span>", E_USER_WARNING);

Context

$sql = "threadedpages"
$error = "1064: You have an error in your SQL syntax; check the
manual that corresponds to your MySQL server version for the right
syntax to use near 'threadedpages' at line 1"
$out = null

Calls

DboSource::showQuery() - CORE/cake/libs/model/datasources/
dbo_source.php, line 681
DboSource::execute() - CORE/cake/libs/model/datasources/
dbo_source.php, line 266
DboSource::fetchAll() - CORE/cake/libs/model/datasources/
dbo_source.php, line 410
DboSource::query() - CORE/cake/libs/model/datasources/dbo_source.php,
line 364
Model::call__() - CORE/cake/libs/model/model.php, line 502
Overloadable::__call() - CORE/cake/libs/overloadable_php5.php, line 50
AppModel::threadedpages() - [internal], line ??
PostsController::admin_index() - CORE/plugins/cakey/controllers/
posts_controller.php, line 11
Dispatcher::_invoke() - CORE/cake/dispatcher.php, line 204
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 171
[main] - APP/webroot/index.php, line 83

Calling a associated model function should be possible in CakePHP
right? If we checkout http://book.cakephp.org/view/1044/hasAndBelongsToMany-HABTM,
We can see that

$this->Recipe->Tag->find('all',
array('conditions'=>array('Tag.name'=>'Dessert')));

When find() function of Tag model can be called from associated
Recipes controller, Why can't I call callthis() function of Page model
from associated Posts controller?

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