EmberFire can handle relationships in several different ways:
hasManywill query for matching records in a root collectionhasManywith thequery: ref => refallows you to alter to assumed queryhasManywith thesubcollection: trueoption will query records in a Firestore subcollectionhasManywith thesubcollection: true, query: ref => refsimilarly allows you tack on a subcollection queryhasManywith theembedded: trueoption will embed the records in the Firestore documentbelongsTowill query for matching records in a root collectionbelongsTowith thequery: ref => refoption allows you to modify the assumed query
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... TODO note about using Cloud Functions for this