@Dao
interface LegoSetDao {

    @Query("SELECT * FROM sets WHERE themeId = :themeId ORDER BY year DESC")
    fun getLegoSets(themeId: Int): LiveData<List<LegoSet>>

    @Query("SELECT * FROM sets WHERE themeId = :themeId ORDER BY year DESC")
    fun getPagedLegoSetsByTheme(themeId: Int): DataSource.Factory<Int, LegoSet>

    // ...
}