ThinkPHP3.2中关联查询

CREATE TABLE `test_avatar` (  `uid` int(11) unsigned NOT NULL DEFAULT '0',  `avatar` varchar(255) NOT NULL DEFAULT '',  PRIMARY KEY (`uid`)) ENGINE=MyISAM DEFAULT CHARSET=utf8;INSERT INTO `test_avatar` VALUES (1,'./Uploads/admin.jpg');CREATE TABLE `test_pro` (  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,  `uid` int(11) unsigned NOT NULL DEFAULT '0',  `name` varchar(255) NOT NULL DEFAULT '',  PRIMARY KEY (`id`)) ENGINE=MyISAM DEFAULT CHARSET=utf8;INSERT INTO `test_pro` VALUES (1,1,'产品1'),(2,1,'产品2');CREATE TABLE `test_user` (  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,  `username` varchar(50) NOT NULL DEFAULT '',  `tel` int(11) unsigned NOT NULL DEFAULT '0',  PRIMARY KEY (`id`)) ENGINE=MyISAM DEFAULT CHARSET=utf8;INSERT INTO `test_user` VALUES (1,'admin',110);

如上三个表：用户头像表、产品表、用户表
怎样在模型中建立关联？

class ProModel extends RelationModel{	protected $_link=array(		'Avatar'=>array(			'mapping_type'=>self::HAS_ONE,			'class_name'=>'Avatar',			'foreign_key'=>'uid',			'mapping_fields'=>'avatar',			'as_fields'=>'avatar',		),        )}

试过用HAS_ONE、BELONGS_TO、HAS_MANY、MANY_TO_MANY都不行，求大神指点

回复讨论(解决方案)

Model下建立ProModelModel.class.php

class ProModelModel extends ViewModel {  			public $viewFields = array(     		'test_avatar'=>array(				'id',...			),     		'test_pror'=>array(			'id',...			'_on'=>''			),                     'test_pror'=>array(			'id',...			'_on'=>''			), 	   ); }