$list = Coupon::hasWhere('used',function($query){
$query->where(['status'=>1]);
})->select();

public function used()
{
return $this->hasOne(CouponUsed::class,'u_type','used')->field('id,u_name,u_type,u_icon');
}
总是报错Undefined property: app\lib\models\Coupon::$used