tp3.2关联模型 BELONGS_TO

<?php

namespace Home\Model;

use Think\Model\RelationModel;

class AttenModel extends RelationModel {
protected $tableName = \'attention\';
protected $_link = array(
\'BabyUser\' => array(
\'mapping_type\' => self::BELONGS_TO,
\'foreign_key\' => \'bid\',
),
);
}