How to retrieve data from Firebase Realtime database (Swift)

Question

I have this piece of working code that saves data to Firebase:

let locRef = locationRef.childByAutoId()
let locItem = [
    senderId : [
        "location": getLocationID()
    ]
]

And I want to retrieve the user's (identified by senderID) "location".

I want to call the data from another function and present it where appropriate, check my comments in the code below:

// Retrieve data from firebase here

let message = messages[indexPath.item] // 1

// Call data I have retrieved below with message 
let text = "Sending from: " + // User Location

if message.senderId == senderId { // 2
    return nil
} else { // 3
    return NSAttributedString(string: text)
}

What is the syntax that would allow me to do this?

Thanks!

actually with the code you attached you are not saving the locationId. Also, do you want to retrieve the user location by the user id? — adolfosrs
– adolfosrs, Commented Jun 27, 2016 at 11:44
I didn't show it but I have another line of code where I save the data. Anyways, yes I want to retrieve location by user ID. — Ahad Sheriff
– Ahad Sheriff, Commented Jun 27, 2016 at 17:13

adolfosrs · Accepted Answer · 2016-06-27 17:21:15Z

1

It sounds pretty straight forward then.

locationRef.child(locItemId).child(senderId).observeSingleEventOfType(.Value, withBlock: { (snapshot) in
        let locationId = snapshot.value!["location"] as! String
    }) { (error) in
        print(error.localizedDescription)
}

answered Jun 27, 2016 at 17:21

adolfosrs

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4 Comments

Ahad Sheriff Over a year ago

One question...where did you get the (locItemId) from? What if I need to retrieve the data from another method?

adolfosrs Over a year ago

@AhadSheriff you changed your question to another thing totally different. In this case you should open a new one not just edit it the way its convenient for you. Thanks.

Ahad Sheriff Over a year ago

Okay will do, but can you still let me know what locItemId was?

adolfosrs Over a year ago

The locItemId is the Id you are generating with childByAutoId(). My answer is assuming that you have this structure /locations/locItemID/senderID and when querying the data you already have the locItemID

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