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 myappimport (    "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.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

    }

}