Automatic unwrapping of value classes when they wrap over types that are "automatically wrapped" by terpal-sql #18

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1. cies commented on Oct 22, 2025

   

   cies

   on Oct 22, 2025

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   Also when deserializing I now do the very verbose:

   object ProductIdSerializer : KSerializer<ProductId> {
     override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("ProductId", PrimitiveKind.LONG)
     override fun serialize(encoder: Encoder, value: ProductId) = encoder.encodeLong(value.value)
     override fun deserialize(decoder: Decoder) = ProductId(decoder.decodeLong())
   }
   
   @Serializable
   data class Product(
   
     @Serializable(with = ProductIdSerializer::class)
     val id: ProductId,
   
     val createdAt: DbInstant,
   
     val updatedAt: DbInstant,
   
     \\ ...
   )
2. cies commented on Oct 22, 2025

   

   cies

   on Oct 22, 2025

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   It seems that kotlinx.serialization handles this well (at least with JSON it does):

   import kotlinx.serialization.Serializable
   import kotlinx.serialization.json.Json
   
   @JvmInline
   @Serializable
   value class ProductId(val value: Long)
   
   @Serializable
   data class ProductDto(
       val id: ProductId,
       val name: String
   )
   
   fun main() {
       val d = Json.decodeFromString<ProductDto>("""{"id": 1000, "name": "qweqw"}""")
       println(d) // ProductDto(id=ProductId(value=1000), name=qweqw)
       
       val s = Json.encodeToString(d)
       println(s) // {"id":1000,"name":"qweqw"}
   }
3. deusaquilus commented on Nov 13, 2025

   

   deusaquilus

   on Nov 13, 2025

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   There a a few ways to get rid of the boilerplate here. The first way is to use contextual serialization and use Param.contextual. If you want even less boilerplate you can define a param-wrapper inside of the package (io.exoquery.sql). So something like:

   package io.exoquery.sql
   
   fun SqlInterpolator.wrap(value: ProductId?): Param<ProductId> = Param.withSer(productId, ProductIdSerializer)

   Give that a shot and see if it works.

   (P.S. io.exoquery.sql will eventually be renamed to io.exoquery.lang)

   👍React with 👍1Reacted by Cies Breijs