How to Efficiently Retrieve Multiple Firestore Documents by ID in a Single Request?

How to Retrieve Multiple Documents by IDs in a Single Request with Google Firestore

To efficiently retrieve multiple documents based on their IDs in a single network call, consider the following approaches:

Node.js:

const getAll = (...documents) =>
  Promise.all(documents.map(doc => doc.get()));

Call getAll() passing in the desired DocumentReference objects:

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 (Python):

def get_all(client, *docs):
  return client.get_all(docs)

docs = (
    db.collection(u'users').document(u'alovelace'),
    db.collection(u'users').document(u'aturing'),
    db.collection(u'users').document(u'hopper'),
)
docs_iterator = get_all(client, *docs)

IN Queries:

Firestore now supports IN queries, allowing you to retrieve documents filtered by a list of IDs efficiently:

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

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