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

    }
}

09-10 07:42
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