Feature request: type mapping

[rocketraman]

Looks interesting and a great start.

Often times domain objects at different layers of an application have different types. For example, an internal domain object might use a different id type than an API or database model type.

Are you planning to provide any capability to map these types by allowing users to inject functions to do type mapping?

[YanneckReiss]

Thanks for your interest @rocketraman ! That is a very cool idea. I haven't thought about it yet tbh. But I can definitely see the use case for it.

What would be a convenient way for you to define such a function when you think about Kotlin projects you are working on?

I could think of some kind of adapter like we know from serialization libraries like Gson, Jackson etc, where we provide such a function to e.g. convert String --> UUID and vice versa. If the plugin finds a matching property name but the type doesn't match, it could look for a matching conversion function provided by the user and automatically add it to the final mapper function instead of the direct property reference.

[SamihMustafa]

+1 for this feature. Sometimes our classes have inner data classes that need to mapped as well. you can add its own KconMapper for the type but TestRepo is unable to map that type

data class TestRemote(
    var uid: String? = null,
    var name: String? = null,
    var location: LocationRemote? = null
)

data class LocationRemote(
    var geohash: String,
    var lat: String,
    var long: String
)


@KConMapper(fromClasses = [TestRemote::class], toClasses = [TestRemote::class])
data class TestRepo(
    @KConMapperProperty(["uid"])
    val userUid: String,
    @KConMapperProperty(["name"])
    val fullName: String,
    val location: LocationRepo? = null
)


@KConMapper(fromClasses = [LocationRemote::class], toClasses = [LocationRemote::class])
data class LocationRepo(
    var lat: String,
    var long: String
)

[rocketraman]

Some prior art in java land might be worth reviewing. Maybe Kotlin can do better. :)

https://mapstruct.org/
https://modelmapper.org/