Extract Options from potentially null JSON values using for expression

Question

I have a JSON document where some values can be null. Using for expressions in json4s, how I can yield None, instead of nothing?

The following will fail to yield whe

Answer 1

The last command should look like:

for {
  JObject(thing) <- res1
} yield thing.collectFirst{case JField("PlanEstimate", JDouble(points)) => points}

Or like

for {
  JObject(thing) <- res1
  points = thing.collectFirst{case JField("PlanEstimate", JDouble(p)) => p}
} yield points