Detached entities 'ToMany.addAll' throws error

Issue Basics

• ObjectBox version 1.4.4
• Reproducibility: Always

Reproducing the bug

When creating entities (for inserting into ObjectBox), the ToMany field will throw this error if I use .addAll(list) it works if I use .add(entity) in a loop over the list.

Code

entity.bodyparts.addAll(bodyparts)

Logs & stackstraces

io.objectbox.exception.DbDetachedException: Cannot resolve relation for detached entities at io.objectbox.relation.ToMany.ensureBoxes(ToMany.java:144) at io.objectbox.relation.ToMany.ensureEntities(ToMany.java:184) at io.objectbox.relation.ToMany.ensureEntitiesWithTrackingLists(ToMany.java:155) at io.objectbox.relation.ToMany.trackAdd(ToMany.java:230) at io.objectbox.relation.ToMany.addAll(ToMany.java:264)

Entities

lateinit var bodyparts: ToMany<BodypartEntity>

Misc

As mentioned above, the issue seems to be with .addAll specifically, whereas .add does work. The issue happens with detached entities, not using @Id(assignable = true).

Start at io.objectbox.relation.ToMany.addAll in ToMany.java, then compare its path through ensureBoxes, ensureEntities, ensureEntitiesWithTrackingLists, and trackAdd with the working add loop described in the report. Done means detached entities can be passed to addAll without DbDetachedException, with coverage for the reported reproduction.