Realtime Database

Learn how to perform CRUD operations with Firebase Realtime Database. Start with adding Realtime Database as your data source.

Read data

To read the data, follow the steps below:

1. Create a new Action

2. Add a Code step

3. Type in the code below and Run Action:

const userId = firebase.auth().currentUser.uid;
return firebase
  .database()
  .ref('/users/' + userId)
  .once('value')
  .then(snapshot => snapshot.val());

4. Check the Result tab - the data should sit in there.

Add a record

To add a record:

1. Add a new action
2. Select Code step and type in the code

3. Run Action:

const listRef = firebase.database().ref("list/");

listRef.set({
   record1: {
      field1: newValue1,
      field2: newValue2,
   },
});

4. Check the Result tab to find a new record created.

Update a record

Updates can be executed using 2 methods: set() and update(). Let's check both of them.

1. Start with adding a new action
2. Select Code step and type in the below code depending on the selected method:

set()

const listRef = firebase.database().ref("list/record");

listRef.set({
      field1: newValue1,
      field2: newValue2,
});

Note that set() can overwrite your data, while update() just updates the required fields

update()

const recordRef = firebase.database().ref("list/record");

recordRef.update({
   field1: newValue1,
});

3. Click Run Action 4.Check the Result section to for the outcome - the requested records should be updated with the new values.

Delete a record

1. Add a new action
2. Set Code step and insert the Code

3. Run Action

const recordRef = firebase.database().ref("list/record");
recordRef.remove();

4. Check the Result section to check that the record has been removed.

All the other operations with the Realtime Database data like Filter, Order can be done via the Firestore API. You can find an API reference here.

More useful articles on how to further manage your data:

• Transform or map your data.
• Add a component to display it.