I have Firebase Authentication in my Android app. My question is how do I link between authenticated users (that appear in Firebase::Auth
tab in the Firebase console) and the database (Firebase::Database
tab).
I need to link data in the database with the relevant user in Auth
by the User UID
that appears in Auth
, and eventually send queries about a specific UID
to get the relevant info in Database
.
Is there something automatic / built-in that does that or do I have to create a new entry for a user in Database
each time I authenticate a user and then create an ID field for it with the UID value that appears in Auth
?
In the User Management docs it explains only about adding users to the Auth
tab and resetting their passwords.
After authentication, create a child with the UID given by Firebase, and set its value to your user class:
//get firebase user
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
//get reference
DatabaseReference ref = FirebaseDatabase.getInstance().getReference(USERS_TABLE);
//build child
ref.child(user.getUid()).setValue(user_class);
USERS_TABLE is a direct child of root.
Then when you want to retrieve the data, get a reference to the user by its UID, listen for addListenerForSingleValueEvent()
(invoked only once), and iterate over the result with reflection:
//get firebase user
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
//get reference
DatabaseReference ref = FirebaseDatabase.getInstance().getReference(USERS_TABLE).child(user.getUid());
//IMPORTANT: .getReference(user.getUid()) will not work although user.getUid() is unique. You need a full path!
//grab info
ref.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
final Profile tempProfile = new Profile(); //this is my user_class Class
final Field[] fields = tempProfile.getClass().getDeclaredFields();
for(Field field : fields){
Log.i(TAG, field.getName() + ": " + dataSnapshot.child(field.getName()).getValue());
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
edit:
Or without reflection:
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
final Profile p = dataSnapshot.getValue(Profile.class);
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With