Dynamically bind HABTM association - Cakebook example not working

Hi,

I am trying to dynamically bind HABTM association using hasOne.

I followed the Recipes example with hasOne at following cakebook URL
http://book.cakephp.org/view/83/hasAndBelongsToMany-HABTM

Here is my code:
$this->Post->bindModel(array(
'hasOne' => array(
'PostsTag',
'FilterTag' => array(
'className' => 'Tag',
'foreignKey' => false,
'conditions' => array('FilterTag.id = PostsTag.tag_id')
))));
$output=$this->Post->find('all', array(
'fields' => array('Post.*')
));
debug($output);

Its not working as shown in cakebook example.
I am getting output like below without Tags at all.
Array
(
[0] => Array
(
[Post] => Array
(
[id] => 1
[title] => test post1
)

)

[1] => Array
(
[Post] => Array
(
[id] => 2
[title] => test post2
)

)
)

I was expecting output like below:
Array
(
0 => Array
{
[Post] => Array
(
[id] => 1
[title] => test post 1
)
[Tag] => Array
(
[0] => Array
(
[id] => 1
[name] => php
)
[1] => Array
(
[id] => 2
[name] => javascript
)
[2] => Array
(
[id] => 3
[name] => xml
)
)
}

My aim is to bind 'Tag' model dynamically in controller action.
I know it will work if I declare var $hasAndBelongsToMany =
array('Tag') beforehand.
Any help would be appreciated.

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