Go chi render 难以处理绑定列表

Question

去这里。试图让 chi 渲染器 return 一个 Order 结构实例的列表并得到一个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)

所以即使我为 Order 定义了 Bind，它似乎并没有自动将 Bind 应用到 [=16 的 collection/list =].

任何人都可以看到我错过了什么吗？一些端点只会 returning 一个 Order，而其他端点（像这个）需要能够 return collection/list of Orders.

Answer 1

与 chi 存储库中的示例一样，您必须创建一个辅助方法来 呈现某些内容的列表 ，在您的情况下，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.

的列表

我已经根据示例改编了您的代码 here:

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

    }
}

Go chi render 难以处理绑定列表

Go chi renderer having difficult processing bound lists

compiler-errors

go

go-chi