FirebaseQuerySnapshotResponse

FirebaseQuerySnapshotResponse is a response object returned by Firebase Cloud Firestore query methods. It contains the results of a query in the form of a QuerySnapshot object, which contains zero or more DocumentSnapshot objects representing each document that matched the query.

Properties

The FirebaseQuerySnapshotResponse object has the following properties:

• querySnapshot: A QuerySnapshot object containing zero or more documents that matched the query.

Methods

The FirebaseQuerySnapshotResponse object has the following methods:

• getDocuments(): Returns an array of DocumentSnapshot objects representing the documents that matched the query.
• size(): Returns the number of documents that matched the query.

Usage

To use FirebaseQuerySnapshotResponse, first create a query object using the collection() and where() methods of the FirebaseFirestore object. Then, call one of the query methods, such as get() or stream(), and pass in a callback function that takes a FirebaseQuerySnapshotResponse object as its parameter.

import firebase from 'firebase';
import { FirebaseQuerySnapshotResponse } from './types/FirebaseQuerySnapshotResponse';

// Create a query object
const db = firebase.firestore();
const query = db.collection('users').where('age', '>=', 18);

// Call a query method and handle the response
query.get().then((response: FirebaseQuerySnapshotResponse) => {
  const documents = response.getDocuments();
  console.log(`Found ${response.size()} matching documents:`);
  documents.forEach(doc => {
    console.log(doc.data());
  });
});

In this example, we create a query object that searches the users collection for users over 18 years old. We then call the get() method to execute the query and retrieve the results. The then() method is called with a callback function that takes a FirebaseQuerySnapshotResponse object. We use this object to retrieve the matching documents and print their data to the console.

Conclusion

FirebaseQuerySnapshotResponse provides a convenient way to retrieve and handle the results of a Firestore query. By using this object and its methods, you can quickly and easily access the data you need from your Firestore database.