我在gobuffalo中使用pop.Connection#ValidateAndCreate时遇到问题。purchaseOrder.Items=models.OrderItems{}...fillpurchaseOrder.Items...for_,item:=rangepurchaseOrder.Items{verrs,err:=tx.ValidateAndCreate(item)iferr!=nil{returnerrors.WithStack(err)}ifverrs!=nil{//showerror}}tx是类型*github.com/gobuffalo/pop.Connect