flatMapCollection
inline fun <T, R> Provider<Collection<T>>.flatMapCollection(crossinline transform: (T) -> Iterable<R>): Provider<List<R>>
Creates and returns a new Provider that flat-maps the elements of the Collection obtained from this into a list using the transform function.
transform should be a pure function.
The returned provider will only be stored in a WeakReference in the parent provider (this).