Go chi 渲染难以处理绑定(bind)列表

Question

到这里。试图让 chi 渲染器返回 Order 的列表struct 实例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)

所以即使我定义了 Bind对于 Order ，它似乎不会自动应用 Bind到 Orders 的集合/列表.
谁能看到我错过了什么？一些端点只会返回一个 Order ，而其他人(比如这个)需要能够返回 Orders 的集合/列表.

Answer 1

如 chi 中的示例存储库，您必须为 创建一个辅助方法渲染列表 ，在你的情况下，订单列表。
首先，你必须实现 render.Renderer方法然后创建一个辅助方法来构建 render.Renderer 的列表.
我已经从示例 here 中修改了您的代码:

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

    }
}