How do I check if a child exists in the a branch in the database so that I can return values based on that child

Question

UI from using the code i mention I have my database set up like this:

root

-Students
    -user1
        -name
        -pass
        -etc...
    -user2

-Admin
    -admin1

I want to check if the current user is an admin or a student so that i can go to a certain reference in the database

This is my code:

    user = FirebaseAuth.getInstance().getCurrentUser();
    reff = FirebaseDatabase.getInstance().getReference().child("Students").child(user.getUid());

    reff.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

            name = dataSnapshot.child("name").getValue().toString();
            lastName = dataSnapshot.child("lastName").getValue().toString();
            studentID = dataSnapshot.child("studentID").getValue().toString();
            email = dataSnapshot.child("email").getValue().toString();
            password = dataSnapshot.child("password").getValue().toString();
            confirmPassword = dataSnapshot.child("password").getValue().toString();
            inputStudentID.getEditText().setText(studentID);
            inputName.getEditText().setText(name);
            inputLastName.getEditText().setText(lastName);
            inputEmail.getEditText().setText(email);
            inputPassword.getEditText().setText(password);
            inputConfirmPassword.getEditText().setText(confirmPassword);


        }

to get the students info I have to do

FirebaseDatabase.getInstance().getReference().child("Students").child(user.getUid());

but if I were to log on as an admin how would I go to that branch and display their info. I've already tried using an if statement with

dataSnapshot.child("Students").hasChild(user.getUID)

with the reference of

FirebaseDatabase.getInstance().getReference()

to see if the user logged in is in the student branch but that didn't work.

UI for both admin and student with the code in picture 3

Code for image 2

What didn't work about what you tried? What specific line of code didn't do what you expect it to do? — Frank van Puffelen, Apr 08 '20 at 23:39
What exactly in this code doesn't work the way you expect? Please also respond with @AlexMamo — Alex Mamo, Apr 09 '20 at 09:55
None of the admins info was displayed unlike it would with the students info @AlexMamo — Spencer, Apr 09 '20 at 21:04
@Spencer I'm not seeing the code where you are trying to get the admins. I have a hard time understanding the question. — Alex Mamo, Apr 10 '20 at 07:46
@AlexMamo The datasnapshot is pulling the admins info from the database just like it would with the students. its inside the event listener — Spencer, Apr 10 '20 at 22:48
Yeah thats what i want it to do but none of the info is being pulled — Spencer, Apr 18 '20 at 20:40
@AlexMamo I figured out the answer to my problem. I read one of your other answers to another post and it looked like I had to use a call back function since the data was asynchronous — Spencer, May 08 '20 at 08:21

score 0 · Accepted Answer · answered May 08 '20 at 08:26

0

In order to see if a child exists in the branch of a node and run your code based on that, you have to use a call back function.

See this article for reference

answered May 08 '20 at 08:26

Spencer

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How do I check if a child exists in the a branch in the database so that I can return values based on that child

1 Answers1