Android Livedata Observe Once Only (Kotlin)

val liveData = viewModel.getPassword(id)liveData.observe(this, object: Observer<Password> {    override fun onChanged(password: Password?) {        liveData.removeObserver(this)    }})

fun <T> LiveData<T>.observeOnce(lifecycleOwner: LifecycleOwner, observer: Observer<T>) {    observe(lifecycleOwner, object : Observer<T> {        override fun onChanged(t: T?) {            observer.onChanged(t)            removeObserver(this)        }    })    /*    observeForever(object : Observer<T> {        override fun onChanged(t: T?) {            observer.onChanged(t)            removeObserver(this)        }    })     */}

liveData.observeOnce(this, Observer<Password> {    if (it != null) {        // do something    }})