java - 在实时数据库中添加数据但添加了错误的子项

Question

我尝试在 userId 下添加新的用户数据，但它会将旧数据替换为新数据，并添加另一个“users”和“user_account_settings”。

这是我的实时数据库: enter image description here

我的实时数据库必须是这样的:添加新的用户数据，而不将旧数据替换为新数据，也不添加“users”和“user_account_settings”。

这是我想要的数据库结构示例:enter image description here

这是添加新用户的代码:

public void addNewUser(String email, String username, String bio, String website, String interests, String address, String profile_photo){

    User user = new User(userID,1 , email, address, StringManipulation.condenseUsername(username));

    myRef.child(mContext.getString(R.string.dbname_users))
            .child(userID)
            .child("users")
            .push()
            .setValue(user);

    UserAccountSettings settings = new UserAccountSettings(
            interests,
            username,
            0,
            0,
            0,
            "",
            username,
            website,
            bio
    );

    myRef.child(mContext.getString(R.string.dbname_user_account_settings))
            .child(userID)
            .child("user_account_settings")
            .push()
            .setValue(settings);
}

这是我从 RegisterActivity.class 调用 firebaseMethods.addNewUser 的代码:

 private void setupFirebaseAuth(){
    Log.d(TAG, "setupFirebaseAuth: setting up firebase auth.");

    mAuth = FirebaseAuth.getInstance();
    firebaseDatabase = FirebaseDatabase.getInstance();
    myRef = FirebaseDatabase.getInstance().getReference();

    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();

            if (user != null) {
                // User is signed in
                Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());

                myRef.addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        // 1st check: Make sure the username is not already in use
                        if (firebaseMethods.checkIfUsernameExists(username, dataSnapshot)){
                            append = myRef.push().getKey().substring(3,10);
                            Log.d(TAG, "onDataChange: username already exists. Appending random string to name: " + append);
                        }

                        username = username + append;

                        // add new user to the database

                        firebaseMethods.addNewUser(email,username,"","","","","");

                        Toast.makeText(mContext, "Signup successful. Sending verification email.", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onCancelled(@NonNull DatabaseError databaseError) {

                    }
                });

                finish();

            } else {
                // User is signed out
                Log.d(TAG, "onAuthStateChanged:signed_out");
            }
            // ...
        }
    };

这是我现在的数据结构，Frank van Puffelen: enter image description here

Answer 1

如果您想在 userid 下添加数据，请执行以下操作:

DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("users").child("userid");

然后该位置将是userid，您添加的任何数据都将位于其下方。