whereIn.ts

/**
* Firestore now supports a where-in query on the admin SDK
*/

import admin from "../admin" // pre-initialised

// Instead of this
async function hasUserTraveledTo(listOfStates, userId) {
  for (const state in listOfStates) {
    const userHasTraveledTo = await admin.firestore().collection(`users/${userId}/travelDestinations`)
      .where('state', '==', state)
      .get()

    if (!userHasTraveledTo.empty) {
      return true
    }
 }
 return false;
}

// Use this
async function hasUserTraveledTo(listOfStates, userId) {
  const userHasTraveledTo = await admin.firestore().collection(`users/${userId}/travelDestinations`)
    .where('state', 'in', listOfStates)
    .get()

  if (!userHasTraveledTo.empty) {
    return true
  }
  return false
}