For-helpers

Using Cats EitherT Monad to make Scala for/yield Great Again !

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Add Cats on your dependencies

Copy and import forHelpers object (It uses implicits)

import cats.implicits._
import helpers.forHelpers._

Use for/yield with :

• Option[A],
• Future[Option[A]],
• Future[Either[A,B]]
• JsResult[A]

And play with for comprehension !

def insert = Action.async(bodyParser.json) {
    request => (for {
        json <- request.body.validate[Contact] |? BadRequest
        dao <- contactDao.add(json) |? InternalServerError
      } yield Created(Json.toJson(dao))).merge
  }

You can specify Result type on forHelpers

Have fun !

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For-helpers is actually not on Maven Repository, you must copy/paste the helper class. But if you like and need (or prefer), I can make the repo on the day