Question

With an expression that returns an Either[Fail, TupleX], how do I fold over the result without having to define local vals in the success block?

// returns Either[Fail, Tuple2[String, String]]
val result = for{
  model <- bindForm(form).right
  key   <- dao.storeKey(model.email, model.password)
} yield (model.email, key)

result fold (
  Conflict(_),
  tuple2 => { // want to define email/key on this line
    val(email,key) = tuple2
    ...
  }
)

Answer 1

Like this

result fold (Conflict(_), { case (email, key) => ... })