0

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。

4

1 回答 1

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.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

    }
}
于 2020-06-22T13:35:19.417 回答