jofhatkea / firebase

Firebase Realtime Database, introduction

Initial setup

1. Think about your data as a list of endpoints

like:

• users/
• users/id
• messages
• messages/id

Just like WP, but way more flexible. A tricky thing is that you can change the structure at any time, even by accident :)

2. Create a new project

https://console.firebase.google.com/u/0/

3. click Add Firebase to your web app

Copy the code to your html file

4. Click realtime database => Get started

5. Click Start in test mode => enable

Beware, this is not recommended for production, a database without authentication is a really bad idea

CRUD - Create, Read, Update, Delete

In our JS file, get a reference to the database

const database = firebase.database();

1. Create - Inserting data

https://firebase.google.com/docs/database/web/read-and-write?authuser=0

database.ref(path).push(obj)

e.g.

database.ref('users/').push({name:"Jonas", email: "jofh[at].kea.dk"})

2. Update - Overwrite existing data

Using .set() overwrites data at the specified location, including any child nodes.

database.ref(path).set(data);

e.g.

database.ref('users/someid').set({name: "Jonas Holbech", email:"jofh[at].kea.dk"});

3. Read - Get data

https://firebase.google.com/docs/database/web/lists-of-data?authuser=0#listen_for_child_events

database.ref(path).on(event, callback)

e.g.

database.ref('users/').on('child_added', snapshot=>{
    const key = snapshot.key;
    const data = snapshot.val();
});

4. Delete - Remove content

Deletes an "endpoint" and all children

database.ref(path).remove();

e.g.

database.ref('users/someid').remove()

Links:

• https://firebase.google.com/docs/web/setup
• https://firebase.google.com/docs/database/web/start?authuser=0