Go语言接口实现：理解值接收器与指针接收器

package main

import (
    "fmt"
    "github.com/ant0ine/go-json-rest/rest" // 假设库路径已更新
    "net/http"
)

// App 结构体定义
type App struct {
    Id   string
    Name string
}

// ResourceController 接口定义
type ResourceController interface {
    Show(w *rest.ResponseWriter, req *rest.Request)
    Create(w *rest.ResponseWriter, req *rest.Request)
    Update(w *rest.ResponseWriter, req *rest.Request)
    Delete(w *rest.ResponseWriter, req *rest.Request)
}

// AppController 类型，旨在实现 ResourceController 接口
type AppController struct{}

// AppController 的方法实现，注意接收器类型为 *AppController
func (self *AppController) Show(w *rest.ResponseWriter, r *rest.Request) {
    app := App{Id: r.PathParam("id"), Name: "Antoine"}
    w.WriteJson(&app)
}
func (self *AppController) Create(w *rest.ResponseWriter, r *rest.Request) {
    app := App{Id: r.PathParam("id"), Name: "Antoine"}
    w.WriteJson(&app)
}
func (self *AppController) Update(w *rest.ResponseWriter, r *rest.Request) {
    app := App{Id: r.PathParam("id"), Name: "Antoine"}
    w.WriteJson(&app)
}
func (self *AppController) Delete(w *rest.ResponseWriter, r *rest.Request) {
    app := App{Id: r.PathParam("id"), Name: "Antoine"}
    w.WriteJson(&app)
}

// MyResourceHandler 辅助结构体和方法，用于注册资源路由
type MyResourceHandler struct {
    rest.ResourceHandler
}

func (self *MyResourceHandler) AddResource(name string, c ResourceController) error {
    // 路由注册逻辑... (省略，与问题核心无关)
    err := self.ResourceHandler.SetRoutes(
        rest.Route{"GET", fmt.Sprintf("/%s/:id", name), func(w *rest.ResponseWriter, r *rest.Request) { c.Show(w, r) }},
        rest.Route{"POST", fmt.Sprintf("/%s", name), func(w *rest.ResponseWriter, r *rest.Request) { c.Create(w, r) }},
        rest.Route{"PUT", fmt.Sprintf("/%s/:id", name), func(w *rest.ResponseWriter, r *rest.Request) { c.Update(w, r) }},
        rest.Route{"DELETE", fmt.Sprintf("/%s/:id", name), func(w *rest.ResponseWriter, r *rest.Request) { c.Delete(w, r) }},
    )
    return err
}

func main() {
    handler := MyResourceHandler{}
    controler := AppController{} // 问题所在：这里创建的是 AppController 值类型
    handler.AddResource("app", controler) // 尝试将 AppController 值类型作为 ResourceController 传递
    http.ListenAndServe(":9008", &handler)
}

./fakeapi.go:93: cannot use controler (type AppController) as type ResourceController in function argument:
    AppController does not implement ResourceController (Create method requires pointer receiver)

func main() {
    handler := MyResourceHandler{}
    // 修正：将 AppController 实例化为指针类型
    controler := &AppController{} // 使用 & 操作符获取 AppController 的地址
    handler.AddResource("app", controler)
    http.ListenAndServe(":9008", &handler)
}