CODEWITHSUNDEEP
swiftfirebasefirebase-realtime-database
Eli
Eli

Reputation: 768

Firebase 2.0 - Reading data from FIRDataSnapshot not working

Iv got a search bar that when you type it searches the database for that users username. The code that find the username work, but when i try and read a specific value it crashes. This is the code

func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {

          Database.child("users").queryOrderedByChild("username").queryEqualToValue(searchText).observeSingleEventOfType(.Value, withBlock: { snapshot in

        print(snapshot)
        print(snapshot.value!["first_name"] as? String)
        print(snapshot.value!["last_name"] as? String)
        print(snapshot.value!["username"] as? String)
        print(snapshot.value!["profile_picture_url"] as? String)
    })
}

The results from printing the snapshot are 

Snap (users) {
12345UIDEXample =     {
    "first_name" = Bob;
    "last_name" = Someone;
    "profile_picture_url" = "exampleurl.com";
    username = bobby;
  };
}

but when i try access

snapshot.value!["first_name"] as? String

it returns nil and crashes? Why if its clearly showing in the json that its returned that the data is there but wont let me exstract the value?

Upvotes: 1

Views: 1781

Answers (2)

blueberries
blueberries

Reputation: 81

When trying to access the Snapshot properties use childSnapshot(forPath:) see another example here.

But basically would look like:

for child in snapshot.children.allObjects as! [FIRDataSnapshot] { let firstname = child.childSnapshot(forPath: "first_name").value as? String }

Upvotes: 2

mdhomer
mdhomer

Reputation: 489

Your snapshot contains the value "12345UIDEXample" on the first level of children.

To access the data you are looking for you can use a loop through the children casting as a FIRDataSnapshot.

for child in snapshot.children.allObjects as! [FIRDataSnapshot]{
    let firstname = child.value!["first_name"] as? String
}

In this example child value will only return another snapshot of your object like so:

Snap(12345UIDEXample) {
    "first_name" = Bob;
    "last_name" = Someone;
    "profile_picture_url" = "exampleurl.com";
    username = bobby;
};

However you will be able to access the desired fields as you tried to previously.

Upvotes: 6

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