How to use multiple entity ids in a entity?

[Divya21]

I have 4 entities(4 tables) and I want to use multiple entities ids in another entity. How to inherit it. Please help!

@Entity 
data class A ( 
@Id var idA: Long = 0,
var nameA: String? = null
) 

@Entity 
data class B ( 
@Id var idB: Long = 0,
var nameB: String? = null
) 

@Entity 
data class C ( 
@Id var idC: Long = 0,
var nameC: String? = null
) 

@Entity
data class MemberTable(
    @Id
    var memberId: Long =0,

//I want to to do something like this...How to achieve this?
var idsA: List<A.idA>? = null,
var idsB: List<B.idB>? = null,
var idsC: List<C.idC>? = null,

)

[greenrobot-team]

If you only want to store IDs you have to do it yourself. With ObjectBox, there are relations. In this case adding ToMany<A>, ToMany<B>, etc. to MemberTable would work. https://docs.objectbox.io/relations

[Divya21]

If you only want to store IDs you have to do it yourself. With ObjectBox, there are relations. In this case adding ToMany, ToMany, etc. to MemberTable would work. https://docs.objectbox.io/relations

I have to use List of Int for this, I have seen it has been added to features in 2016(link is below). So is there any way? https://github.com/objectbox/objectbox-java/issues/7#issue-202969381

[greenrobot-team]

You would have to write a custom converter for this. https://docs.objectbox.io/advanced/custom-types

Alternatively, use ToMany<A> anyhow. But get the list of IDs of the related entities using Box.getRelationIds(MemberTable_.toManyOfA, memberTable.memberId). https://github.com/objectbox/objectbox-java/blob/220fc35ef296b9957a29207596abf8c1313dfcb5/objectbox-java/src/main/java/io/objectbox/Box.java#L657

[Divya21]

You would have to write a custom converter for this. https://docs.objectbox.io/advanced/custom-types

Alternatively, use ToMany<A> anyhow. But get the list of IDs of the related entities using Box.getRelationIds(MemberTable_.toManyOfA, memberTable.memberId). https://github.com/objectbox/objectbox-java/blob/220fc35ef296b9957a29207596abf8c1313dfcb5/objectbox-java/src/main/java/io/objectbox/Box.java#L657

Thanks a lot!