Question: In play 2.1 reads are used to marshall Json to objects. But how can I do this when the case class has only one field. The ideom that works for more fields does not work, as with one field 'and' is not used. Thus I do not get a FunctionBuilder.

The following code gives me a type mismatch. How can I fix this?

```
case class Data(stamm: Seq[String])

implicit val dataReads  = (
  (__ \ "stamm").read(Reads.list[String])
)(Data)

```

Answer: 
Json combinators doesn't work for single field case class.

Pascal (writer of this API) has explained this situation here
<https://groups.google.com/forum/?fromgroups=#!starred/play-framework/hGrveOkbJ6U>

There are some workarounds which works, like this one:

```
case class A(value: List[Int])
val areads = (__ \ 'value).read[List[Int]].map{ l => A(l) } // covariant map

```
Based on @yokomizor's answer, I found the simplest solution to create a `Formatter` to be

```
case class Person(name: String)
val personFormatter: Format[Person] =
  (__ \ "full_name").format[String].inmap(Person.apply, unlift(Person.unapply))

```