我在model层使用关联查询,用的$product->alias('p')->join('brand_product b','p.id=b.product_id')->where('b.brand_id',$brand_id)->order('p.slug ASC')->select();查询语句,我的$product变量是实例化的Product模型,可是查询结果却是另外一张表的内容,打印这条sql语句的结果:string(123) "SELECT * FROM mg_brand p INNER JOIN mg_brand_product b ON p.id=b.product_id WHERE b.brand_id = '206' ORDER BY p.slug ASC "