gastsail

 exports.onItemCreation = functions.firestore.document('purchases/{purchaseId}')
 .onCreate(async(snapshot, context) => {
     const itemDataSnap = await snapshot.ref.get()
     return admin.firestore().collection('mail').add({
        to: [itemDataSnap.data().email],
        message: {
          subject: 'Your reservation is here !',
          html: 'Hey '+ itemDataSnap.data().name +'. This is your reservation for the event and it costs $' + itemDataSnap.data().dollarqty +', thanks for the purchase.',
        }
      }).then(() => console.log('Queued email for delivery!'));

gastsail

fun getEventsDB(): LiveData<MutableList<Event>>{
val data = MutableLiveData<Mutablelist<Event>>()
val myList = mutableListOf<Event>()
FirebaseFirestore.getInstance()
            .collection("events")
            .get().addOnSuccessListener {
                // Get results
                myList.add(results)
                data.value = myList
            }.addOnFailureListener{

gastsail

    fun fetchEventData():LiveData<MutableList<Event>>{
        val mutableData = MutableLiveData<MutableList<Event>>()
        repo.getEventsDB().observeForever { eventList ->
            mutableData.value = eventList
        }

        return mutableData
    }

gastsail

viewModel.fetchEventData().observe(this, Observer {
 // Handle the UI with the results
}

gastsail

fun getEventsDB(): LiveData<MutableList<Event>>{
val data = MutableLiveData<Mutablelist<Event>>()
val myList = mutableListOf<Event>()
FirebaseFirestore.getInstance()
            .collection("events")
            .get().addOnSuccessListener {
                // Get results
               FirebaseFirestore.getInstance().collection(id).get().addOnSuccessListener {
               ...
               }.addOnFailureListener{

gastsail

suspend fun getEventsDB(): Resource<MutableList<Event>>{
val myList = mutableListOf<Event>()
val eventList = FirebaseFirestore.getInstance().collection("events").get().await()
// we can do wathever we want with the events, for example get them all
  for (document in eventList) {
            val photoUrl = document.getString("photoUrl")
            val eventName = document.getString("name")
            val time = document.getString("time")
            myList.add(Event(photoUrl!!, eventName!!, time!!))
        }             

gastsail

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-play-services:1.1.1'
implementation 'com.google.firebase:firebase-firestore:21.3.1'
implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0-rc03"
implementation "androidx.lifecycle:lifecycle-extensions:2.1.0" 

gastsail

/**
 * Awaits for completion of the task without blocking a thread.
 *
 * This suspending function is cancellable.
 * If the [Job] of the current coroutine is cancelled or completed while this suspending function is waiting, this function
 * stops waiting for the completion stage and immediately resumes with [CancellationException].
 */
public suspend fun <T> Task<T>.await(): T {
    // fast path
    if (isComplete) {

gastsail

sealed class Resource<out T> {
    class Loading<out T> : Resource<T>()
    data class Success<out T>(val data: T) : Resource<T>()
    data class Failure<out T>(val throwable: Throwable) : Resource<T>()
}

gastsail

interface IEvent {
    suspend fun getEvents(): Resource<MutableList<Event>>
}