BaaS at Scale | Update Subscription Granularity

update-subscriptions.js

// Method 1: High Data Usage
// =========================

const rootReference = new Firebase(firebaseUrl)
const itemsReference = rootReference.child('items')

itemsReference.on('value', function(data) {
  // Update the UI with the items update
})

// Method 2: Low Data Usage
// ========================

const rootReference = new Firebase(firebaseUrl)

const itemIds = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r"]

itemIds.forEach((itemId) => {
  const itemReference = rootReference.child(`items/${itemId}`)

  itemReference.on('value', function(data) {
    // Update the UI with the item update
  })
})