How to persist a map?

[nepomu...@gmail.com]

Hi,

I'm wondering what to do to have a map field in an entity, like

class MyEntity(val map: Map[String, Int]) extends Entity

As maps are not supported natively, I thought about using en-/decoding to List[(String, Int)]. Is this the preferred way?

Thanks,

Nepomuk

[Flavio W. Brasil]

Hi,

How do you plan to encode/decode the List[(String, Int)]? Using an opaque value at the database level?

Best,

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Flavio W. Brasil

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[sebasti...@googlemail.com]

Hi Flavio,

good question: I thought as Activate supports immutable.List natively, it would work automatically. Unfortunately, it didn't. Is there any example how to persist maps?

Regards,

Nepomuk

[Flavio W. Brasil]

Hi Nepomuk,

It depends on how you want to have the values persisted at the database level. I normally use a list of entities, so it is possible to persist it without using opaque column values:

case class MyEntityMapValue(key: String, value: String) extend Entity

class MyEntity(private val _map: List[MyEntityMapValue]) extend Entity {

def map = _map.map(kv => (kv.key, kv.value)).toMap

}

Ideally, Activate should have native support for maps.

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Flavio W. Brasil

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