到這里。試圖讓 chi 渲染器返回一個(gè)Order結(jié)構(gòu)實(shí)例列表并得到一個(gè)我不明白的編譯器錯(cuò)誤：package myappimport ( "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 }}當(dāng)我去編譯這段代碼時(shí)，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，即使我定義了Bindfor Order，它似乎也不會(huì)自動(dòng)將其Bind應(yīng)用于Orders.誰(shuí)能看到我錯(cuò)過(guò)了什么？一些端點(diǎn)只會(huì)返回一個(gè)Order，而其他端點(diǎn)（比如這個(gè)）需要能夠返回一個(gè)集合/列表Orders。
1 回答
一只萌萌小番薯
TA貢獻(xiàn)1795條經(jīng)驗(yàn) 獲得超7個(gè)贊
與存儲(chǔ)庫(kù)中的示例一樣chi，您必須創(chuàng)建一個(gè)輔助方法來(lái)呈現(xiàn)某些東西的列表，在您的情況下是訂單列表。
首先，您必須實(shí)現(xiàn)該render.Renderer方法，然后創(chuàng)建一個(gè)輔助方法來(lái)構(gòu)建render.Renderer.
我已從此處的示例中修改了您的代碼：
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
}
}
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