Support data observers for related entities

This might be a feature request. It seems that currently it is not possible to listen for nested changes.

• ObjectBox version: 1.2.1
• Reproducibility: always

boxFor(Item::class.java).query().build().subscribe().observer { items ->
    // Not called when Note.text changes.
}

Entities

@Entity
class Item {

    @Id
    open var id: Long = 0L

    lateinit open var notes: ToMany<Note>
}

@Entity
class Note {

    @Id
    open var id: Long = 0L

    open var text: String? = null

    @Backlink
    lateinit open var parentItem: ToOne<Item>
}

[greenrobot]

I thought we have tracked that already, but did not find it…

[jpmcosta]

I think the following code could also trigger changes in data observers:

item.notes.add(Note())
item.notes.applyChangesToDb()