How to query a DocumentReference in Firestore

Question

I have a collection of bar orders, and in each document i have a field with a reference for a barman.

---

I'm trying to made a where with the doc reference.

Something like that:

orders = this.database.collection("orders",
    (ref) => ref.where("barman.path", "==", "barmen/" + this.auth.auth.currentUser.uid),
);
return orders.valueChanges();

barman.path because when i get a doc with a field referece, this is the way to get the reference path.

I already tried to use just barman instead barman.path.

I already tried to made where with full 'path' of docref (firestore.googleapis.com/pro...).

Any ideas?

Put only the id instead of the full reference will dificult other parts of the system.

Answer 1

In order to query a reference field, you should create a DocumentReference object that matches the location you are trying to query for, and use that. Note that this needs to be a native Firestore reference, as an AngularFirestoreCollection and AngularFirestoreDocument will just show up to Firestore as a "custom object type". You can get this with the ref member of the AngularFirestore types.

I'm not sure where the '.path' part of your query is coming form, as the actual field you are querying for is barman. I've removed it in the example.

In your case, this will look something like:

const queryReference = this.database
    .collection('barmen')
    .doc(this.auth.auth.currentUser.uid).ref;

orders = this.database.collection('orders',
    (ref) => ref.where('barman', '==', queryReference),
);
return orders.valueChanges();

I obviously couldn't test this exactly as there isn't enough code to, for example, show that this.auth.auth.currentUser.uid works in this case. But it should point you in the right direction.