i have a marker interface ```interface RoomModel``` and an entity that implements this interface `...

# android

[lawlorslaw]

i have a marker interface

interface RoomModel

and an entity that implements this interface

@Entity(tableName = "ContentAuthorModule")
ContentAuthorModule : RoomModel {}

now if i have a

List<RoomModel>

how do i check if its a

List<ContentAuthorModule>

I tried to do

roomModels is List<ContentAuthorModule>

override fun saveRoomModels(roomModels: List<RoomModel>) {
    when(roomModels) {
        is List<ContentAuthorModule> ->
            contentAuthorModuleDao.insertAll(roomModels)
    }
}

but it gives my a syntax error that says

Cannot check for instance of erased type : List<ContentAuthorModule>

is there another way to do this?

[Ahmed Ibrahim]

You can use roomModels.filterIsInstance<ContentAuthorModule>()
which will return a list of type List<ContentAuthorModule>

[Ahmed Ibrahim]

You can't do an is because List is a generic, so during runtime the types are erased.