Hello, 

First post in Kinvey and hope this hasn't been answered before. I am working on my app now and figuring our the registration part. When the user fill the form (providing during the process a username and mobile), I want to check in the backend if the username is taken or not. I also want to check if the mobile number is taken or not (each mobile number should be mapped to one account only). 

To accomplish the above, I did the following for username:

func isUsernameAvailable(input: String) -> Void {
        let potentialUsername = input
        KCSUser.checkUsername(
            potentialUsername,
            withCompletionBlock: { (username: String!, usernameAlreadyTaken: Bool, error: NSError!) -> Void in
                if usernameAlreadyTaken {
                   self.usernameErrorLabel.text = "Username taken. Please try another"
                }else{
                    
                    self.isMobileRegistered(self.mobileTextField.text!)
                }
            }
        )
    }

 Then for the mobile function embedded here, I did this:

func isMobileRegistered(input:String)->Void{
        let mobile = input
        KCSUserDiscovery.lookupUsersForFieldsAndValues(
            [ "mobile" : "01111102"],
            completionBlock: { (objectsOrNil: [AnyObject]!, errorOrNil: NSError!) -> Void in
                if errorOrNil == nil {
                    //array of matching KCSUser objects
                    NSLog("Found %d mobile", objectsOrNil.count)
                } else {
                     self.usernameErrorLabel.text = ""
                     self.userInstance.email = self.emailTextField.text
                     self.userInstance.mobile = self.mobileTextField.text
                     self.userInstance.username = self.usernameTextField.text
                     self.userInstance.password = self.passwordTextField.text
                     self.userInstance.name = self.nameTextField.text
                     self.performSegueWithIdentifier("mobileVerification", sender: self)
                }
            },
            progressBlock: nil
        )
    } 

Now what I expect to happen is that the "if" condition of the mobile function will be triggered because there is actually a user with mobile number 011111102 registered already. What happens instead is that the else clause is executed and segue is executed. How come this is happening?

Thanks in advance

I tried using the KCSUserAttributeEmail and it detected that the same email exists in database. But when I try with same syntax but change field to mobile I get an error. Here is the code I am trying now and the error too..:

 KCSUserDiscovery.lookupUsersForFieldsAndValues(
            [ "mobile" : "0549135363" ],
            completionBlock: { (objectsOrNil: [AnyObject]!, errorOrNil: NSError!) -> Void in
                if errorOrNil == nil {
                    //array of matching KCSUser objects
                    NSLog("Found %d Smiths", objectsOrNil.count)
                } else {
                    NSLog("Got An error: %@", errorOrNil)
                }
            },
            progressBlock: nil
        )

 And the error code I get is:

2016-07-01 00:05:31.994 appName[6924:1860821] Kinvey Ping Success
All Input Validation Successful
2016-07-01 00:05:51.212 appName[6924:1860821] Got An error: Error Domain=KCSServerErrorDomain Code=400 "The query string in the request has an invalid syntax" UserInfo={NSLocalizedDescription=The query string in the request has an invalid syntax, NSErrorFailingURLKey=https://baas.kinvey.com/user/jfdkjfkdjfd/_lookup, Kinvey.kinveyErrorCode=InvalidQuerySyntax, KinveyKit.HTTPMethod=POST, Kinvey.RequestId=83948wjd9jd9j39jd39jd3, NSLocalizedFailureReason=not allowed to invoke _lookup on attribute mobile}

 Still unable to fix this simple issue...

Any update here? Still unable to fix...