PFUser.currentUser vs字符串

Question

I'm working on iOS swift with Parse. I've a code snippet as following:

override func viewDidLoad() {
    super.viewDidLoad()

    var currUser = PFUser.currentUser()

    var prefQuery = PFQuery(className: "preferences")
    prefQuery.whereKey("username", equalTo: currUser)

...

The above codes gives me nothing although I've one record in 'preference' table for the current user. But it returns a row when I use as : ... prefQuery.whereKey("username", equalTo: "Kale")

I'm confused what's wrong with using PFUser.currentUser() method to compare with a string?

Thanks in advance,

Answer 1

You need to use:

PFUser.currentUser()?.username

but because it is a optional you will need to unwrap the best way to do it is

if let user = PFUser.currentUser()?.username{
    //Query user 
    println("Found user \(user)")
} else {
    //Error handle
    println("No user logged")
}

Answer 2

I reviewed your code and I think PFUser.currentUser() is not of type NSString, you're getting confused with it. It contains dictionary of user information. Instead, get the valueofkey of it. I think the key should be username. So, replace this :

prefQuery.whereKey("username", equalTo: currUser.username)

Hope it helps.. :)