Playframework - 如何实现读取列表？

Question

I have a custom reads I am using, which looks like this:

def myReads(companyId: Long): Reads[MyClass] = (
  (JsPath \ "name").read[String] and
    Reads.pure(companyId)
  ) (MyClass.apply _)

I am trying to read a List of MyClass, and I am not sure how. So if I wanted to read only one MyClass I did it like this by providing my reads:

request.body.validate[MyClass](MyClass.myReads(100)).fold(e => , valid => )

The thing is I want to read a list of MyClass so I tried something like this:

request.body.validate[List[MyClass]](( __ \ "list").read[List[MyClass]](MyClass.myReads(100)).fold()

But it expect Reads for list, not sure how to fix it. Have any ideas?

Thanks!

Answer 1

Your reads must be

request.body.validate[List[MyClass]](
  ( __ \ "list").read[List[MyClass]](
    Reads.list(MyClass.myReads(100))
  )
).fold()