How to ignore primary key when I insert room database entity

I’m wondering how to ignore primary key when I insert some entity.
(Room Entity have to have more than 1 primary keys)
For example, there is an entity following under.

@Entity(primaryKeys = ["id"], tableName = "someEntity")
data class SomeEntity(
    val id: Int = 0,
    val someClass: SomeClass<*>? = null
)

the insert logic will be like this.

@Insert(onConflict = OnConflictStrategy.REPLACE)
abstract fun insert(obj: SomeClass): Completable

parameter "obj" will have two column(fields).
The problem that I think is when I have insert logic like that,
do I have to care about "id"(with autoGenerate annotation) column?

In my project, when I have to insert SomeEntity with dao,
I can only get SomeClass<*>? type, without id: Int.
Does @AutoGenerate annotation on column id can solve my problem?
If "yes", please show me some simple example guys..!
Or if you guys have other ways to solve my problem, help me..!

>Solution :

Room understands val id: Int = 0 if it is marked with @PrimaryKey as a value to be ignored when inserting.

@Entity
data class SomeEntity(
    @PrimaryKey(autoGenerate = true)
    val id: Int = 0,
    val someClass: SomeClass<*>? = null
)

and when creating a new instance SomeEntity(someClassInstance) is completely fine.

Note: if SomeClass isn’t a basic class that SQL is able to save, you need to have some way to serialize it.