firestore update document code example

Example 1: firestore cloud function update documents

import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';

admin.initializeApp();

export const setProductsToExpired = functions.https.onRequest(async(request, response) => {
    const expiredProducts = await admin.firestore()
      .collection('products')
      .where('timestamp','<=', admin.firestore.Timestamp.now())
      .get();
    
    const batch = admin.firestore().batch();
 
    expiredProducts.forEach(doc => {
      batch.update(doc.ref,'expired',true);
    });
    
    await batch.commit();
    //Successful operation
    response.send("200");
    });

Example 2: firestore set a document

let data = {
  name: 'Los Angeles',
  state: 'CA',
  country: 'USA'
};

// Add a new document in collection "cities" with ID 'LA'
let setDoc = db.collection('cities').doc('LA').set(data);

Example 3: firestore update array

let washingtonRef = db.collection('cities').doc('DC');

// Atomically add a new region to the "regions" array field.
let arrUnion = washingtonRef.update({
  regions: admin.firestore.FieldValue.arrayUnion('greater_virginia')
});
// Atomically remove a region from the "regions" array field.
let arrRm = washingtonRef.update({
  regions: admin.firestore.FieldValue.arrayRemove('east_coast')
});

Example 4: firestore update map

let initialData = {
  name: 'Frank',
  age: 12,
  favorites: {
    food: 'Pizza',
    color: 'Blue',
    subject: 'recess'
  }
};

let updateNested = db.collection('users').doc('Frank').update({
  age: 13,
  'favorites.color': 'Red'
});

Example 5: firebase cloud method update

firebase deploy --only functions:functionNameHere

Example 6: document.set() firebasefirestore java

var washingtonRef = db.collection("cities").doc("DC");// Atomically add a new region to the "regions" array field.washingtonRef.update({    regions: firebase.firestore.FieldValue.arrayUnion("greater_virginia")});// Atomically remove a region from the "regions" array field.washingtonRef.update({    regions: firebase.firestore.FieldValue.arrayRemove("east_coast")});