AppModel method to fix hasMany multi-select data

AppModel.php

 <?php
 /**
 * Transform a set of hasMany multi-select data into a format which can be saved
 * using saveAll in the controller
 * 
 * @param array $data
 * @param str $fieldToSave
 * @param int $deleteId
 * @return array
 */
  public function massageHasManyForSaveAll($data, $fieldToSave, $deleteId = null) {
		foreach ($this->belongsTo as $model => $relationship) {
			if ($relationship['foreignKey'] != $fieldToSave) {
				$relatedModel = $model;
				$relatedModelPrimaryKey = $this->{$model}->primaryKey;
				$relatedForeignKey = $relationship['foreignKey'];
			}
		}
		
		if ($deleteId !== null) {
			$this->deleteAll(array(
				$this->alias .'.'. $relatedForeignKey => $deleteId
			));
		}
		
		if (is_array($data[$fieldToSave])) {
			foreach ($data[$fieldToSave] as $packageId) {
				$return[] = array($fieldToSave => $packageId);
			}
			
			return $return;
		}
		
		return $data;
	}