Unresolved reference: Transformations

Question

I'm trying to follow the android documentation to implement Transformations in my project but I run into this problem Unresolved reference: Transformations. I don't know why my project can't see the Transformations class.

I'm using Kotlin version 1.5.21' and here is my code

class MyViewModel(private val repository: PostalCodeRepository) : ViewModel() {
    private val addressInput = MutableLiveData<String>()
    val postalCode: LiveData<String> = Transformations.switchMap(addressInput) {
            address -> repository.getPostCode(address) }


    private fun setInput(address: String) {
        addressInput.value = address
    }
}

Any guidance is really appreciated.

Answer 1

From lifecycle version 2.6.0 instead of using Transformations, you need to use the extension function directly myLiveData.switchMap or myLiveData.map (source)