到这里。试图让chi渲染器返回Order
结构实例的列表,并得到我不理解的编译器错误:
package myapp
import (
"net/http"
"github.com/go-chi/render"
)
type Order struct {
OrderId string
Status string
}
func (*Order) Bind(r *http.Request) error {
return nil
}
func GetAllOrderByCustomerId(dbClient DbClient, customerId string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// fetch all customer orders from the DB
orders,err := dbClient.FetchAllOrdersByCustomerId(customerId)
if err != nil {
log.Error("unable to fetch orders for customer", err)
render.Render(w, r, NewInternalServerError(err))
return
}
render.Bind(r, &orders)
return
}
}
当我去编译这段代码时,我得到:fizz/buzz/myapp/order_fetcher.go:136:20: cannot use &orders (type *[]Order) as type render.Binder in argument to render.Bind:
*[]Order does not implement render.Binder (missing Bind method)
因此,即使我已经为Bind
定义了Order
,它似乎也不会自动将该Bind
应用于Orders
的集合/列表。谁能看到我所缺少的吗?某些端点将仅返回单个
Order
,而其他端点(如此端点)需要能够返回Orders
的集合/列表。 最佳答案
就像chi
存储库中的示例一样,您必须创建一个辅助方法来呈现列表(在您的情况下为订单列表)。
首先,您必须实现render.Renderer
方法,然后创建一个辅助方法来构建render.Renderer
列表。
我已经从示例here修改了您的代码:
type Order struct {
OrderId string
Status string
}
// Render implement render.Renderer
func (*Order) Render(w http.ResponseWriter, r *http.Request) error {
// do something
return nil
}
// newOrderList is a helper method to make list of render.Renderer
func newOrderList(orders []*Order) []render.Renderer {
list := []render.Renderer{}
for _, order := range orders {
list = append(list, order)
}
return list
}
func GetAllOrderByCustomerId(dbClient DbClient, customerId string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// fetch all customer orders from the DB
orders, err := dbClient.FetchAllOrdersByCustomerId(customerId)
if err != nil {
log.Error("unable to fetch orders for customer", err)
render.Render(w, r, NewInternalServerError(err))
return
}
// render list of orders
render.RenderList(w, r, newOrderList(orders))
return
}
}