CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
Coder123
Coder123

Reputation: 854

Delete field from Firebase database (Android)

I am using recyclerView, each row represents a stock, and its connected to a Firebase accout that has users auth, and everytime a user is created i add him to my Firebase databse (when they sign up my Firebase account), each user has "user_stocks" (child) field and i made a longClickListener which deletes a row in my stock list, problem is that i need to also delete this stock in the users account: enter image description here

i cant find a way to delete the stock from the Firebase database:

    public void deleteFromFirebase(String user_id) {
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference myRef = database.getReference("users").child(user_id);

        myRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                User user = dataSnapshot.getValue(User.class);
               //No metter what i did, it did not delete from fb
            }

    @Override
    public void onCancelled(DatabaseError error) {
        // Failed to read value
    }
});
}

Can someone please point me to the right direction? Thanks!

Upvotes: 2

Views: 2164

Answers (1)

pantos27
pantos27

Reputation: 629

Just place null in that child as a value

FirebaseDatabase.getInstance().getReference("users").child(user_id).setValue(null);

Update

Deleting by value

public void deleteFromFirebase(String user_id,final String stockName) {
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference myRef = database.getReference("users").child(user_id).child("user_stocks");

        myRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override 
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot stock : dataSnapshot.getChildren()) {
                if(stock.getValue().equals(stockName))
                    stock.getRef().removeValue();
               }
            } 

    @Override 
    public void onCancelled(DatabaseError error) {
        // Failed to read value 
    } 
}); 
}

Upvotes: 3

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