Scala Future with filter in for comprehension

Question

In the example below I get the exception java.util.NoSuchElementException: Future.filter predicate is not satisfied

I want to have the result Future(

Answer 1

Of course I figured out one solution myself. Perhaps there are better, more idiomatic, solutions?

import scala.concurrent.Future
import scala.util.{ Try, Success, Failure }
import scala.concurrent.ExecutionContext.Implicits.global

val f1 = Future( 1 )
val f2 = for {
  i <- f1
  if( i == 2 )
} yield "Test1"
val f3 = f2.recover{ case _ => "Test2"  }
// OR val f3 = f2.fallbackTo( Future( "Test2" ) )
f3.value