add clear product cache

go/gopath/src/fohow.com/apps/models/order_model/order_detail.go

@@ -40,7 +40,7 @@ type OrderDetail struct {
 	Attrs                string         `orm:"-"     json:"attrs"`      // decimal(10,2)
 	Depart               int64          `orm:"column(depart)" json:"-"` // datetime
 	Package              bool           `orm:"-"                                json:"package"`
-	PacakageList         []*ProductItem `orm:"-"                                 json:"pakage_list"` // varchar(255)
+	PacakageList         []*ProductItem `orm:"-"                                 json:"package_list"` // varchar(255)
 }
 
 func (self *OrderDetail) TableName() string {