problem with counterCache of cakePHP - php

Question

I have in a video sharing website project these models :
class Video extends AppModel {
var $name = 'Video';
var $hasAndBelongsToMany = array(
'Tag' => array(
'className' => 'Tag',
'joinTable' => 'videos_tags',
'foreignKey' => 'video_id',
'associationForeignKey' => 'tag_id',
'unique' => true,
)
);
}
class Tag extends AppModel {
var $name = 'Tag';
var $hasAndBelongsToMany = array(
'Video' => array(
'className' => 'Video',
'joinTable' => 'videos_tags',
'foreignKey' => 'tag_id',
'associationForeignKey' => 'video_id',
'unique' => true,
)
);
}
class VideosTag extends AppModel {
var $name = 'VideosTag';
var $belongsTo = array(
'Video' => array(
'className' => 'Video',
'foreignKey' => 'video_id',
),
'Tag' => array(
'className' => 'Tag',
'foreignKey' => 'tag_id',
'conditions' => '',
'counterCache' => 'videos_tag_counter'
)
);
}
The counterCache for tags is not working. I don't know why and when I tried to add a beforeSave() callback to videosTag model I found that it doesn't execute when a video get saved (and this video has tags and i find them in the database so how the relation videosTags is saved ? ) !!! can any body explain why this is happening.

Answer 1

Saving a Video with data like this:
array(
'Video' => array(
...
),
'Tag' => array(
'Tag' => array(
...
),
),
);
on the Video model will not trigger a beforeSave callback on the VideosTag model because Cake handles HABTM data without requiring (or even using) the join/with/through model.
There is no built in functionality for what you are trying to achieve, as far as I am aware.
Check out Counter Cache behavior for HABTM relations, might do what you need