Go chi 渲染器难以处理绑定列表

Question

到这里。试图让 chi 渲染器返回一个Order结构实例列表并得到一个我不明白的编译器错误：

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，即使我定义了Bindfor Order，它似乎也不会自动将其Bind应用于Orders.

谁能看到我错过了什么？一些端点只会返回一个Order，而其他端点（比如这个）需要能够返回一个集合/列表Orders。

Answer 1

与存储库中的示例一样chi，您必须创建一个辅助方法来呈现某些东西的列表，在您的情况下是订单列表。首先，您必须实现该render.Renderer方法，然后创建一个辅助方法来构建render.Renderer.我已从此处的示例中修改了您的代码：type Order struct {    OrderId string    Status  string}// Render implement render.Rendererfunc (*Order) Render(w http.ResponseWriter, r *http.Request) error {    // do something    return nil}// newOrderList is a helper method to make list of render.Rendererfunc 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    }}