firebase.md

Firebase

Basics

• Firebase = Company
• Firebase Firestore = Realtime, noSQL, Cloud Database

Setup

• add new Firestore at https://console.firebase.google.com/

• use code snippets for auth and paste it to firebase.js

• get/read/query data:

db.collection(collectionName)
  .where(key, comparison, value) // additional selector ("city", "===", "Stuttgart")
  .orderBy(key, order) // additional order ("name", "desc")
  .limit(number) // additional limit (3)
  .get(); // getting a snapshot, iterate and .data()

• realtime updating data:

db.collection(collectionName)
  .onSnapshot((snap) => {
    let changes = snap.docChanges();
    changes.forEach((change) => {}});
  });

• add data:

db.collection(collectionName).add(obj);

• delete data:

db.collection(collectionName)
  .doc(id)
  .delete();

• update data:

db.collection(collectionName)
  .doc(id)
  .update({ key: value });