How Can I Efficiently Retrieve Multiple Firestore Documents with a Single Network Call?

Retrieving Multiple Documents in Firestore with Single Network Call

Firestore provides an efficient method for retrieving multiple documents with a single round trip. This can significantly optimize performance when dealing with a large number of document fetches.

Node.js Approach

In Node.js, you can use the getAll() method to retrieve multiple documents:

const {Firestore} = require('@google-cloud/firestore');

const firestore = new Firestore();

const documentRefs = [
  firestore.doc('col/doc1'),
  firestore.doc('col/doc2'),
];

firestore.getAll(...documentRefs).then(docs => {
  docs.forEach(doc => {
    console.log(`Document: ${doc.id}, Data: ${JSON.stringify(doc.data())}`);
  });
});

This method returns a promise that resolves to an array containing the resulting document snapshots.

In Queries Support

Cloud Firestore now supports IN queries, which provides another efficient way to retrieve multiple documents:

const inClause = firestore.FieldPath.documentId(), 'in', ["123", "456", "789"];

const query = firestore.collection('myCollection').where(inClause);
const docs = await query.get();

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