Firebase

Question 1

install angularfire2

Answer 1

npm install angularfire2 firebase –save
adjust environments.ts
add “AngularFireModule.initializeApp(environment.firebase)” to imports
import AngularFireDatabaseModule too

Question 2

disguise the last characters of your API key by

Answer 2

changing it from WXI to IXW

Question 3

what to inject from AngularFire2

Answer 3

constructor(db: AngularFireDatabase)

Question 4

how to bind to a list

Answer 4

items: FirebaseListObservable;
constructor(db: AngularFireDatabase) {
this.items = db.list(‘/items’);
}

Question 5

how to retrieve an object

Answer 5

db.object(‘/item’)

Question 6

FirebaseObservable methods

Answer 6

set(value) is a destructive update
update(value) is nondestructive (only updates included values)
remove()

Question 7

Data retrieved from the object binding contains

Answer 7

special properties retrieved from the unwrapped Firebase DataSnapshot

Question 8

What is the metafield $key

Answer 8

The key for each record. This is equivalent to each record’s path in our database as it would be returned by ref.key()

Question 9

What is the metafield $value

Answer 9

If a primitive, the primitive value will be stored under $value and can be changed and saved like any other field

Question 10

By default, AngularFire2 unwraps the

Answer 10

Firebase DataSnapshot, but you can get the data as the original snapshot by specifying the preserveSnapshot option

Question 11

How to retrieve a Firebase list by query

Answer 11

db.list(‘/items’, {
query: {
limitToLast: 10,
orderByKey: true
}
})