Gaurav Wadhwani Gaurav Wadhwani - 1 year ago 155
Swift Question

Working with Firebase and Date Filters

I have a hotel reservation app that shows a swipe-able calendar to the user. Now the end goal is to provide a calendar like interface with small dots below each date that is reserved. For now, I am just trying to print on the console all reservations between start date and end date (where start and end dates are start and end of months respectively).

However, I am unable to get this to work with Firebase. Here's how the data is on Firebase at the moment:

"reservations" : {
"-KSgRjwpssoZJWjV9ScM" : {
"checkin" : 1474950600,
"checkout" : 1475116200,
"customer" : "-KMVMMudWJlFeiimtgJl"

And here's my Swift code to retrieve data:

private var ref: FIRDatabaseReference!

// viewdidload:
ref = FIRDatabase.database().reference()

// logic to fetch data {

// Background Processing
// Check Firebase for events between startdate and enddate
print("Fetching Reservations")

self.ref.child("reservations").queryStarting(atValue: startDate.timeIntervalSince1970, childKey: "checkin").observe(.childAdded, with: { (snapshot) -> Void in

print("Data Retrv.\n")


Here's what gets printed onto the console right now:

Fetching Reservations
Fetching Reservations

As its clearly visible that the data falls within the second range but I still can't get it to show up.

What may be wrong here? Thanks.

Answer Source

I'v tried with this code and it worked:

let ref = FIRDatabase.database().reference()
let refReservations = ref.child("reservations")

let startDate: Double = 1472668200.0

  .queryOrdered(byChild: "checkin")
  .queryStarting(atValue: startDate)
  .observeSingleEvent(of: .value) { (snap: FIRDataSnapshot) in

The difference between your code and mine is I call one query more:

.queryOrdered(byChild: "checkin")
.queryStarting(atValue: startDate)


.queryStarting(atValue: startDate, childKey: "checkin")
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