If I have: ```abstract class KomapperBaseRepositor...

# getting-started

[dave08]

If I have:

abstract class KomapperBaseRepository<ENTITY : Any, ID : Any, META : EntityMetamodel<ENTITY, ID, META>>(
    private val db: R2dbcDatabase,
    private val entityMetamodel: META,
) {
    suspend fun create(entity: ENTITY): ENTITY = db.runQuery(QueryDsl.insert(entityMetamodel).single(entity))
}

how do I avoid having to provide all three type params when deriving from this? Doesn't the compiler infer them when I provide the entityMetamodel in the constructor?

[Javier]

Is it asking for all or just ID?

[Javier]

probably it is failing due ID, try <_, whatever, _>

[dave08]

How do I provide only id...?

[Javier]

to allow inferring a type param you can use _

[dave08]

Doesn't seem to be understood by Intellij...

[dave08]

It's asking me to create class _...

[Sam]

You need Kotlin 1.7+ to use the underscore, perhaps you're on an older version?

[dave08]

I WAS at language version 1.6, but I changed that... and updated to 1.9.23... maybe there's some lingering setting somewhere... which is really funny...

[dave08]

I'll check.

[dave08]

In the same file I put data object Foo and the IDE didn't complain... any other ideas @Sam?

[dave08]

It seems like _ can only be used in calling functions: https://kotlinlang.org/docs/generics.html#underscore-operator-for-type-arguments, but not for deriving classes from...

[Javier]

Create a factory function or invoke function in the companion, but looks like a feature request to me\

[dave08]

How would that function help me in deriving a class from it?

[Javier]

I mean, the problem is instantiating KomapperBaseRepository(…) is not working with _, right? due it is a class

[Javier]

if it is a function, it should work, no?

[dave08]

I'm not instantiating it .... it's an abstract class I'm deriving from

[Javier]

Ah okay, sorry I missundertood that