mariuswilms

<?php
class Movie extends AppModel {
    // ...
    var $hasMany = array(
        'Poster' => array(
            'className' => 'Media.Attachment',
            'foreignKey' => 'foreign_key',
            'conditions' => array('Poster.model' => 'Movie', 'Poster.group' => 'poster'),
            'dependent' => true,
        ),

mariuswilms

<?php
class Movie extends AppModel {
    // ...
    var $hasMany = array(
        'Attachment' => array(
            'className' => 'Media.Attachment',
            'foreignKey' => 'foreign_key',
            'conditions' => array('Attachment.model' => 'Movie'),
            'dependent' => true,
    ));

mariuswilms

<?php
class Movie extends AppModel {
    var $actsAs = array('Media.Transfer');

    var $validate = array(
        'file' => array(
            'resource'   => array('rule' => 'checkResource'),
            'access'     => array('rule' => 'checkAccess'),
            'location'   => array('rule' => array('checkLocation', array(MEDIA_TRANSFER, '/tmp/'))),
            'permission' => array('rule' => array('checkPermission', '*')),