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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What is firestore transaction?

Cloud Firestore supports atomic operations for reading and writing data. … There are two types of atomic operations in Cloud Firestore: Transactions: a transaction is a set of read and write operations on one or more documents . Batched Writes: a batched write is a set of write operations on one or more documents.11 Kas 2021

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