It's best to have a function to create your BaseAppController:
func NewBaseAppContoller(subClasses ...interface{}) *BaseAppController {
for _, i := range subClasses {
}
}
On Monday, 27 June 2016 15:16:40 UTC+1, David Koblas wrote:
>
> I've got a program that is trying to implement functions on "subclasses",
> where the parent can check to see if the interface is implemented. For
> perspective, it's really dealing with REST URL generation based on if
> methods exist.
>
> What I'm running into is that based on the following pattern, both the
> IList and IGet interfaces are found on the TestController object, when only
> 1 is implemented. When the IGet interface is called I get a panic.
>
> I would rather not make concrete definitions of the Get/List on the base
> struct and then have to override them, would much rather do the test for
> existence then go from there.
>
> Code is available on the playground --
> https://play.golang.org/p/5j58fejeJ3
>
> package main
>
> import "fmt"
>
> type IGet interface {
> Get(int)
> }
>
> type IList interface {
> List(int)
> }
>
> type Application struct {
> name string
> }
>
> type BaseAppController struct {
> *Application
>
> IGet
> IList
> }
>
> type TestController struct {
> *BaseAppController
> }
>
> func (ctrl *BaseAppController) Init() {
> fmt.Println("In Init")
>
> if f, ok := interface{}(ctrl).(IGet); ok {
> fmt.Println("Controller Found GET", f)
> } else {
> fmt.Println("Controller NOT Found GET", f)
> }
>
> if f, ok := interface{}(ctrl).(IList); ok {
> fmt.Println("Controller Found LIST", f)
> } else {
> fmt.Println("Controller NOT Found LIST", f)
> }
> }
>
> func (ctrl *BaseAppController) Call() {
> fmt.Println("In Call")
>
> if f, ok := interface{}(ctrl).(IGet); ok {
> fmt.Println("Controller Found GET - going to call", f)
>
> f.Get(7)
> } else {
> fmt.Println("Controller NOT Found GET - can't call", f)
> }
> }
>
> // Test controller implements the Get Method
> func (ctrl *TestController) Get(v int) {
> fmt.Printf("Hi name=%s v=%d\n", ctrl.name, v)
> }
>
> func main() {
> app := Application{"hithere"}
> ctrl := TestController{&BaseAppController{Application: &app}}
>
> ctrl.Init()
>
> ctrl.Call()
> }
>
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