How to map a defer result?

[schleumer]

I have a hypothetical fetcher:

val usersCount = Fetcher((repo: Repo, ids: Seq[Long]) ⇒ repo.users.countByParent(ids))

this will return me a Seq[Count] where case class Count(id: Long, count: Long) there's a way that i can make this field:

Field("usersCount", UsersCountType, resolve = c ⇒ usersCount.defer(c.value.id))

becomes something like this:

Field("usersCount", LongType, resolve = c ⇒ usersCount.defer(c.value.id).map(_.count))

Sorry if this is the wrong place to ask this...

[OlegIlyenko]

You just need to use explicitly a DeferredValue which has a map method (which is defined on the Action):

Field("usersCount", LongType, resolve = c ⇒ DeferredValue(usersCount.defer(c.value.id)).map(_.count))

I probably will add it in the docs. This question was asked quite often recently :)

[schleumer]

This is simply beautiful, thanks! This couldn't be easier. Worked really great.