Embedded feature

[Scogun]

Problem
In real life use cases (especially with libraries like Room), we often deal with nested/embedded objects.
For example:

data class AccountWithCurrencies(
    @Embedded
    val account: Account,
    @Relation(
        parentColumn = "id",
        entityColumn = "accountId"
    )
    val currencies: List<AccountCurrency>
)

Currently, to map it into a DTO:

@KOMMMap(from = [AccountWithCurrencies::class])
data class AccountDto(
    val name: String,
    val currencies: List<AccountCurrencyDto>
) {
    var id: Long = 0L
        internal set
}

…we need to use two explicit converters:

@KOMMMap(from = [AccountWithCurrencies::class])
data class AccountDto(
    @MapConvert<AccountWithCurrencies, AccountDto, NameConverter>(NameConverter::class, "account")
    val name: String,
    val currencies: List<AccountCurrencyDto>
) {
    @MapConvert<AccountWithCurrencies, AccountDto, IdConverter>(IdConverter::class, "account")
    var id: Long = 0L
        internal set
}

Potential solution
Introduce an Embedded mapping feature.
This would allow specifying the source property once, so that multiple fields can be mapped from it.