Add a single item to a relation?

[nehalist]

Hey there,

how do I add a single item to a relation? The docs only showcase how to set the relation, but I want to add a single item to existing relations. Interestingly,$obj->setRelation([...$obj->getRelations(), $newRelation]); doesn't even work and I have to manually set relations after I've iterated through all new relations (by awkwardly temp saving the relations and such).

Any ideas? Thanks!