thinkphp关联模型的使用方法

<?php
namespace TestModel;
<span style="color:#FF0000;">use ThinkModelRelationModel;</span>
 
	class ProductModel extends <span style="color:#FF0000;">RelationModel</span>{ 
 
	protected $_link = array(
	
	'attr' =>array(
	'mapping_type' => self::HAS_MANY,
	'class_name' => 'attr',
	'foreign_key' => 'product_id',
	'mapping_name' => 'a', //用来取数据
	'mapping_fields' => 'id,name,value',
	// 'as_fields' => 'id,name,value',
	)
 
	);}

public function testRelation(){
 
 $postData = I('post.');
 // dump($postData);die;
 
 $productModel = D("Test/Product");
 
 $data['name'] = $postData['phone_name'];
 // $data['thumb'] = $photo[0];
 $data['thumb'] = 'kk';
 $data['create_time'] = time();
 <span style="color:#FF0000;"> $data['a']= array( //这里为二维数组，因为是HAS_MANY模型
 array( 'name' => 'color',
 'value' => serialize($postData['phone_color'])),
 array(
 'name' => 'size',
 'value' => $postData['phone_size']),</span>
 
 ); 
 
 $result = $productModel->relation(true)->add($data); 
 dump($result);exit;
 
 }