firestoreImport.js

// Imports
const firestoreService = require('firestore-export-import')
const firebaseConfig = require('./src/config/firebase.js')
const serviceAccount = require('./serviceAccount.json')
const fs = require('fs')
const tempFileName = `${__dirname}/data-temp.json`;

// procedure
(async () => {
  const fileContents = fs.readFileSync(`${__dirname}/src/data.json`, 'utf8')
  const data = JSON.parse(fileContents)
  const transformed = transformDataForFirestore(data)
  fs.writeFileSync(tempFileName, JSON.stringify(transformed))
  await jsonToFirestore()
  fs.unlinkSync(tempFileName)
})()

// Helper Functions
// -------------------------------------

// JSON To Firestore
async function jsonToFirestore () {
  try {
    console.log('Initialzing Firebase')
    await firestoreService.initializeApp(serviceAccount, firebaseConfig.databaseURL)
    console.log('Firebase Initialized')

    await firestoreService.restore(tempFileName)
    console.log('Upload Success')
  } catch (error) {
    console.log(error)
  }
}

// In order to preserve ids in data.json
// as ids in firestore
// must use keyed object (id being the key) instead of array of records
function transformDataForFirestore (data) {
  const collections = data
  delete collections.stats
  const collectionsById = {}
  Object.keys(collections).forEach((collectionKey) => {
    collectionsById[collectionKey] = {}
    const collection = collections[collectionKey]
    collection.forEach((record) => {
      collectionsById[collectionKey][record.id] = record
      delete collectionsById[collectionKey][record.id].id
    })
  })
  return collectionsById
}