CODEWITHSUNDEEP
angulartypescriptfirebasefirebase-realtime-databaseionic2
Schimay
Schimay

Reputation: 81

how to retrieve a complete list of users from firebase database?

I am using the ionic framework.I want to display all the users stored in my firebase database in the form of a list on a page. The way i am storing these users is by their uid like this :

user |_uid1 | |_email:value | |_tag:value |_uid2 | |_email:value | |_tag:value |_...

The problem i'm facing is that i don't know how to retrieve all the users and how to go through them one by one, displaying everybody's email ids. How do i do it in typescript or javascript? Please Help !

Upvotes: 1

Views: 943

Answers (1)

Rohit Padma
Rohit Padma

Reputation: 603

HERE is code snippet which i used to get all the users (user class can have any structure) from fire base.

 DatabaseReference  mDatabase = FirebaseDatabase.getInstance().getReference("users");
 DatabaseReference  df = mDatabase.child("user");



    df.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            AllUserlist.clear();
            for(DataSnapshot d : dataSnapshot.getChildren()) {
                User user = new User();
                HashMap<String,Object> map= (HashMap<String, Object>)d.getValue();
                Gson gson = new Gson();
                JsonElement jsonElement = gson.toJsonTree(map);
                user = gson.fromJson(jsonElement, User.class);
                AllUserlist.add(user);

                }

                 }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

AllUserlist will have all the users data including the email which you need. Hope it helps !!

Upvotes: 1

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