Play 2.0: Optional list in query

Question

I'm trying to define a route with an optional list as query parameter ``` GET /places controllers.Application.query(filter: Option[Seq[Int]]) ``` but getting this error ``` conf/routes - PlayException: Compilation error [`)' expected but `]' found] ``` I know Play 2 handles `Option`s well, and I want it to pass `Seq` to my custom `QueryStringBindable`, how to achieve this?

Accepted Answer

It seems like Play 2.0.2 routing parser doesn't support nesting type parameters. I've found workaround, I've defined alias for `Seq[Int]`:

```
type IntSeq = Seq[Int]
```

and used it instead of original type:

```
GET /places controllers.Application.query(filter: Option[IntSeq])
```

Now it works as expected.

Play 2.0: Optional list in query

Solution

Problem