Kotlin - Array property in data class error

Question

I'm modelling some JSON - and using the following lines

data class Metadata(
        val id: String,
        val creators: Array<CreatorsModel>
)

along with:

data class CreatorsModel (
        val role: String,
        val name: String
)

However keep seeing the error: Array property in data class error.

Any ideas why this is?

FYI, the JSON looks like:

{
"id": "123",
"creators": [{
   "role": "Author",
    "name": "Marie"
    }
  ]
}

maybe you should try List instead of Array?

Alexandr Kolesnik
– Alexandr Kolesnik

2019-07-29 07:55:24 +00:00
Commented Jul 29, 2019 at 7:55 — Alexandr Kolesnik
– Alexandr Kolesnik, Commented Jul 29, 2019 at 7:55

Can_of_awe · Accepted Answer · 2019-07-29 07:59:20Z

37

In Kotlin you should aim to use List instead of Array where possible. Array has some JVM implications, and although the compiler will let you, the IDE may prompt you to override equals and hashcode manually. Using List will make things much simpler.

You can find out more about the difference here: Difference between List and Array types in Kotlin

answered Jul 29, 2019 at 7:59

Can_of_awe

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2 Comments

user924 Over a year ago

what about ByteArray? I plan to use Entity with image field to save it for the Room

user823738 Over a year ago

@user924 Your best bet is to wrap the ByteArray in a wrapper and use that wrapper in the data class. That will overcome this limitation.

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