<?php 
class AppModel extends Model{

    /**
     * Performs an 'unbindModel' on an array of associations
     * 
     * @param array $bindings An array of model associations to unbind from current model
     * @return null
     */
    function filterBindings($bindings = null) {
        if (empty($bindings) && !is_array($bindings)) {
            return false;
        }
        $relations = array('hasOne', 'hasMany', 'belongsTo', 'hasAndBelongsToMany');
        $unbind = array();
        foreach ($bindings as $binding) {
            foreach ($relations as $relation) {
                if (isset($this->$relation)) {
                    $currentRelation = $this->$relation;
                    if (isset($currentRelation) && isset($currentRelation[$binding])) {
                        $unbind[$relation][] = $binding;
                    }
                }
            }
        }
        if (!empty($unbind)) {
            $this->unbindModel($unbind);
        }
    }
}
?>