How do I use a collection group in firestore?

You can do this manually by going to the Firebase Console, selecting the “Index” tab for Cloud Firestore, going to the “Single Field” section, clicking the “Add exemption” button, specifying you want to create an exemption for the “reviews” collection with the “author” field and a “collection group” scope, and then …

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How do I read from firestore?

To read a single document, we can use DocumentReference’s get() method that returns a Task<DocumentSnapshot> , while reading multiple documents from a collection or Query, we can use Firestore Query’s get() method that returns an object of type Task<QuerySnapshot>. Both methods read the data only once.

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