Steven Schafer Steven Schafer - 2 months ago 31
Swift Question

Swift / Firebase: How do I properly store a Facebook user into Firebase database when they create an account?

I'm trying to save users to my firebase database. I'm using a

FBSDKLoginManager()
to create an account / log in. Upon account creation, I want to store the users into my firebase database. I can currently log the user in and their email shows up in the Auth tab of firebase (see screenshot), but my
updateChildValues
doesn't seem to be having any affect (also see screenshot).

Am I placing the
updateChildValues
in the right place? It's currently place within
signInWithCredential
. I also have to perform an
FBSDKGraphRequest
to get the info I'm interested in storing in my firebase database.

The Auth tab of my firebase shows the authentication is working:
enter image description here

But the Database isn't being updated:
enter image description here

func showLoginView() {
let loginManager = FBSDKLoginManager()
loginManager.logInWithReadPermissions(fbPermissions, fromViewController: self, handler: { (result:FBSDKLoginManagerLoginResult!, error:NSError!) -> Void in

if ((error) != nil) {
print("Error loggin in is \(error)")
} else if (result.isCancelled) {
print("The user cancelled loggin in")
} else {
// No error, No cancelling:
// using the FBAccessToken, we get a Firebase token
let credential = FIRFacebookAuthProvider.credentialWithAccessToken(FBSDKAccessToken.currentAccessToken().tokenString)

// using the credentials above, sign in to firebase to create a user session
FIRAuth.auth()?.signInWithCredential(credential) { (user, error) in
print("User logged in the firebase")

// adding a reference to our firebase database
let ref = FIRDatabase.database().referenceFromURL("https://project-12345.firebaseio.com/")

// guard for user id
guard let uid = user?.uid else {
return
}

// create a child reference - uid will let us wrap each users data in a unique user id for later reference
let usersReference = ref.child("users").child(uid)

// performing the Facebook graph request to get the user data that just logged in so we can assign this stuff to our Firebase database:
let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, email"])
graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in

if ((error) != nil) {
// Process error
print("Error: \(error)")
} else {
print("fetched user: \(result)")

// Facebook users name:
let userName:NSString = result.valueForKey("name") as! NSString
self.usersName = userName
print("User Name is: \(userName)")
print("self.usersName is \(self.usersName)")

// Facebook users email:
let userEmail:NSString = result.valueForKey("email") as! NSString
self.usersEmail = userEmail
print("User Email is: \(userEmail)")
print("self.usersEmail is \(self.usersEmail)")

// Facebook users ID:
let userID:NSString = result.valueForKey("id") as! NSString
self.usersFacebookID = userID
print("Users Facebook ID is: \(userID)")
print("self.usersFacebookID is \(self.usersFacebookID)")
}
})

// set values for assignment in our Firebase database
let values = ["name": self.usersName, "email": self.usersEmail, "facebookID": self.usersFacebookID]

// update our databse by using the child database reference above called usersReference
usersReference.updateChildValues(values, withCompletionBlock: { (err, ref) in
// if there's an error in saving to our firebase database
if err != nil {
print(err)
return
}
// no error, so it means we've saved the user into our firebase database successfully
print("Save the user successfully into Firebase database")
})
}
}
})
}


Update:

Apparently after 10 minutes or so, the database was updated with empty Facebook data... Not sure why it's taking so long. Here's a screenshot:

enter image description here

Answer

You should only update the values when the completion block "graphRequest.startWithCompletionHandler" is executed because that's when you will get your data from the Facebook!. "usersReference.updateChildValues" needs to be inside "graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in" the completion block. I have attached it below. Try it!!

func showLoginView() {
    let loginManager = FBSDKLoginManager()
    loginManager.logInWithReadPermissions(fbPermissions, fromViewController: self, handler: { (result:FBSDKLoginManagerLoginResult!, error:NSError!) -> Void in

        if ((error) != nil) {
            print("Error loggin in is \(error)")
        } else if (result.isCancelled) {
            print("The user cancelled loggin in")
        } else {
            // No error, No cancelling:
            // using the FBAccessToken, we get a Firebase token
            let credential = FIRFacebookAuthProvider.credentialWithAccessToken(FBSDKAccessToken.currentAccessToken().tokenString)

            // using the credentials above, sign in to firebase to create a user session
            FIRAuth.auth()?.signInWithCredential(credential) { (user, error) in
                print("User logged in the firebase")

                // adding a reference to our firebase database
                let ref = FIRDatabase.database().referenceFromURL("https://project-12345.firebaseio.com/")

                // guard for user id
                guard let uid = user?.uid else {
                    return
                }

                // create a child reference - uid will let us wrap each users data in a unique user id for later reference
                let usersReference = ref.child("users").child(uid)

                // performing the Facebook graph request to get the user data that just logged in so we can assign this stuff to our Firebase database:
                let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, email"])
                graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in

                    if ((error) != nil) {
                        // Process error
                        print("Error: \(error)")
                    } else {
                        print("fetched user: \(result)")

                        // Facebook users name:
                        let userName:NSString = result.valueForKey("name") as! NSString
                        self.usersName = userName
                        print("User Name is: \(userName)")
                        print("self.usersName is \(self.usersName)")

                        // Facebook users email:
                        let userEmail:NSString = result.valueForKey("email") as! NSString
                        self.usersEmail = userEmail
                        print("User Email is: \(userEmail)")
                        print("self.usersEmail is \(self.usersEmail)")

                        // Facebook users ID:
                        let userID:NSString = result.valueForKey("id") as! NSString
                        self.usersFacebookID = userID
                        print("Users Facebook ID is: \(userID)")
                        print("self.usersFacebookID is \(self.usersFacebookID)")

                        //graphRequest.startWithCompletionHandler may not come back during serial
                        //execution so you cannot assume that you will have date by the time it gets
                        //to the let values = ["name":
                        //By putting it inside here it makes sure to update the date once it is
                        //returned from the completionHandler
                        // set values for assignment in our Firebase database
                        let values = ["name": self.usersName, "email": self.usersEmail, "facebookID": self.usersFacebookID]

                        // update our databse by using the child database reference above called usersReference
                        usersReference.updateChildValues(values, withCompletionBlock: { (err, ref) in
                            // if there's an error in saving to our firebase database
                            if err != nil {
                                print(err)
                                return
                            }
                            // no error, so it means we've saved the user into our firebase database successfully
                            print("Save the user successfully into Firebase database")
                        })
                    }
                })


            }
        }
    })
}