Google Firestore - How to get several documents by multiple ids in one round-trip?

Question

I am wondering if it's possible to get multiple documents by a list of ids in one round trip (network call) to the Firestore database.

Answer 1

if you're within Node:

https://github.com/googleapis/nodejs-firestore/blob/master/dev/src/index.ts#L978

/**
* Retrieves multiple documents from Firestore.
*
* @param {...DocumentReference} documents - The document references
* to receive.
* @returns {Promise<Array.<DocumentSnapshot>>} A Promise that
* contains an array with the resulting document snapshots.
*
* @example
* 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])}`);
* });
*/

This is specifically for the server SDK

UPDATE: Cloud Firestore Now Supports IN Queries!

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