How To Do CRUD Operations In Firebase With CurrentUserId?

I'm creating a simple website and i'cant use firebase realtime databases crud operations with currentUserId. My auth system working good; i can signIn/signUp/signOut on database.

Solution 1:

Are you asking how to write data in a location that is specific to the current user? If so:

var currentUser = firebase.auth().currentUser;
var DataRef = firebase.database().ref('users/' + currentUser.uid + '/exercises/');

Note that this only works if the current user is guaranteed to be already signed in. If you can't guarantee that, put the above code in an auth state listener.