Setting custom key when pushing new data to firebase database

Question

Well, I am new to Firebase and I want to have my own keys while pushing new data to database.

Problem:

FireBase.push().setValue(mapped_values);

This gives structure like below:

How can I create my own custom key there? Such as username or something.

Answer 1

Calling push() will generate a key for you.

If instead you use child(), you can determine they key/path yourself.

ref.child("Victor").setValue("setting custom key when pushing new data to firebase database");

Answer 2

        String key="1234567sdfsf8";
        //custom object
        User user=new User();
        DatabaseReference mDatabase;
        mDatabase = FirebaseDatabase.getInstance().getReference();
        mDatabase.child("Users").child(key).setValue(user);

Answer 3

As an update to the top answer, the Firebase API has been changed and setValue() does not work anymore. Now you must use the set() function instead:

ref.child("Victor").set("setting custom key when pushing new data to firebase database");

Answer 4

You can create a custom key using setValue() even if the root contains many children for example if 'Users' is the root and you want to add users with email as a key it will be like this

firebase.child("firebase url").child("Users").child("user_1 email").setValue(...)

firebase.child("firebase url").child("Users").child("user_2 email").setValue(...)

etc

Answer 5

let's say your db look like

 "BookShelf" : {
    "book1" : {
      "bookName" : "book1_push"
       ...
     }

your code to be (don't use push(), push() generate a random key)

DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference();
Book data = new Book();
mDatabase.child("BookShelf").child("book1").setValue(data);
    
     

Answer 6

If you are using FirebaseUI :

private static final CollectionReference usersCollection = FirebaseFirestore.getInstance().collection("users");

User user = new User("MyUsername", "MyPictureUrl");
String userKey = "1234567sdfsf8";

usersCollection.document(userKey).set(user); //MAGIC LINE

Answer 7

In POST request it will generate ID's but in PATCH, PUT request it will mention the key which will be provided by you.