What is Subcollection in firebase?

A subcollection is a collection associated with a specific document . Note: You can query across subcollections with the same collection ID by using Collection Group Queries. You can create a subcollection called messages for every room document in your rooms collection: collections_bookmark rooms. class roomA.

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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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