contoh polymorphism

userServicePolymorphism.go

// Service interface
type Service interface {
	GetUserDetailsByUserID(id int) (DetailsResponse, error)
}

// service 
type service struct {
	client Client
}

// GetUserDetailsByUserID function yang mengambil data user dengan memanggil fungsi di client
func (s service) GetUserDetailsByUserID(id int) (DetailsResponse, error) {
	return s.client.FetchUserDetailsByID(id)
}

// ------------ Mock polymorphism ----------------------------------
// ServiceMock user service mock
type ServiceMock struct{}

// GetUserDetailsByUserID function langsung mengembalikan 
func (s ServiceMock) GetUserDetailsByUserID(id int) (DetailsResponse, error) {
	result := DetailsResponse{}
	details := make([]Details, 0)
	detail := Details{}
	details = append(details, detail)
	result.Total = 1
	result.Data = details
	return result, nil
}