走。 接口中单值上下文中的多值

Question

I read below topic

Go: multiple value in single-value context

But I don't understand this explain in my case. May be that's way because I want to use interface

I get error multiple-value NewObject() in single-value context in below case

type Facade interface {
    GetOne() int
}

type ObjectOne struct{
    one int
}

func NewObject()(Facade, error){
    o := &ObjectOne{}
    return o , errors.New("Some funny error")
}

func(o * ObjectOne)GetOne()int{
    return 1
}

func SomeWhereInCode(){
    newFacade , err := Facade(NewObject())
// And here. I get error probbably because Facade constructor return one arguments (interface) and NewObject() return two. How should be ? 
}

I also tryed pass error as pointer to ObjectOne but still get error compiler

type Facade interface {
    GetOne() int
}

type ObjectOne struct{
    one int
}

func NewObject(facadeError* error)(Facade, error){
    o := &ObjectOne{}
    *facadeError = errors.New("Some funny error")
    return o , *facadeError
}

func(o * ObjectOne)GetOne()int{
    return 1
}

func SomeWhereInCode(){
    var facadeError = error()
    newFacade , err := Facade(NewObject(&facadeError))
}

Answer 1

In the expression:

newFacade , err := Facade(NewObject())

Facade(NewObject()) is not a constructor but an explicit type conversion. You do not need it at all because NewObject(), being a constructor already, returns a Facade type and an error. So just:

newFacade , err := NewObject()

should work seems to me.