setValue method not updating to Firebase database

I'm trying to test saving data to my Firebase Database but I've been having some problems. Here is the code I have for when the user presses the Submit button:

    var ref = FIRDatabase.database().reference()
var user = FIRAuth.auth()?.currentUser

@IBOutlet weak var titleEntry: UITextField!

@IBOutlet weak var townAndZip: UITextField!

@IBOutlet weak var pickPrice: UISegmentedControl!

@IBOutlet weak var pickDuration: UISegmentedControl!

@IBAction func tapBackground(sender: AnyObject) {
    view.endEditing(true)
}

@IBAction func postTask(sender: AnyObject) {

    if ((titleEntry.text?.isEmpty) != nil && (townAndZip.text?.isEmpty) != nil) {

        var price:String = pickPrice.titleForSegmentAtIndex(pickPrice.selectedSegmentIndex)!
        var duration:String = pickDuration.titleForSegmentAtIndex(pickDuration.selectedSegmentIndex)!

        self.ref.setValue(["title": titleEntry.text!])
        self.ref.child("tasks").child(user!.uid).setValue(["price": price])
        self.ref.child("tasks").child(user!.uid).setValue(["duration": duration])
        self.ref.child("tasks").child(user!.uid).setValue(["town_zip": townAndZip.text!])

        self.performSegueWithIdentifier("postAdd", sender: self)
        print("Posted!")

    } else {
        let alert = UIAlertController(title: "Error", message: "Please make sure you filled in everything.", preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Understood!", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert, animated: true, completion: nil)
    }

No matter what I type in, the app performs the segue and does not update in my Firebase database. Also, if I only input data for one of the fields, it still performs the segue and doesn't display the alert. I thought it was a problem with Firebase itself but it's likely a mistake I just can't find. Any help would be greatly appreciated.