Retrieve data from an unknown child name with Firebase and Swift

Question

I'm using Firebase as the database for my IOS app. I want to retrieve data of several users from the database.

Here is my database organization:

Users
- UserID1
  - Location: value1
- UserID2
  - location: Value2
...

I want to retrieve the location data of all the users of the database.

The basic snapshot fonction

    ref.child("Users").child("").child("Location").observe(.value, with: {
        snapshot in

        for Location in snapshot.children {
            self.locationsArray.append((Location as AnyObject).key)
        }
        print(self.locationsArray)
    })

My question is: how can I retrieve all the Locations even if I don't specify (I can't) the userID that is the name of a child before? Thanks.

Jay Jay · Accepted Answer · 2017-01-14T14:53:53

Here's a code snippet that retrieves and prints the uid of each user and their location.

We can further refine our results with a .query

let usersRef = ref.child("users")
usersRef.observeSingleEvent(of: .value, with: { (snapshot) in

    for snap in snapshot.children {
        let userSnap = snap as! FIRDataSnapshot
        let uid = userSnap.key //the uid of each user
        let userDict = userSnap.value as! [String:AnyObject] //child data
        let location = userDict["Location"] as! String
        print("key = \(uid) is at location = \(location)")
    } 
})

Retrieve data from an unknown child name with Firebase and Swift

2 Answers