How Can I Efficiently Fetch Multiple Firestore Documents with Different IDs in One Request?

Firestore: Fetching Multiple Documents with Multiple IDs in a Single Request

Firestore offers an efficient method for retrieving multiple documents with distinct IDs in a single round-trip to the database. This can significantly improve performance by minimizing the number of network calls required.

Node.js SDK

Within Node.js, you can use the getAll() method to accomplish this:

let documentRef1 = firestore.doc('col/doc1');
let documentRef2 = firestore.doc('col/doc2');

firestore.getAll(documentRef1, documentRef2).then(docs => {
  console.log(`First document: ${JSON.stringify(docs[0])}`);
  console.log(`Second document: ${JSON.stringify(docs[1])}`);
});

Server SDK (Deprecated)

For the server SDK (deprecated), you can use the following method:

firestore.getAll().then(docs => {
  console.log(`First document: ${JSON.stringify(docs[0])}`);
});

Cloud Firestore IN Queries

Firestore now supports IN queries, which provide a more direct approach for retrieving documents with multiple IDs:

myCollection.where(firestore.FieldPath.documentId(), 'in', ["123", "456", "789"])

This query will efficiently retrieve the documents with the specified IDs in a single request.

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