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firebaseNotes.jsx
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firebaseNotes.jsx
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// creating a customers database
const db = firebase.database();
const customers = db.ref().child("customers");
const primaryKey = "customer_one"
customer.child(primaryKey).set({
"firstName": "david",
"lastName": "East",
"location": "SF"
})
// creating a difference branch so that its not embedded
const db = firebase.database()
const events = db.child('events/fm');
const attendee = db.child('eventAttendee/fm');
events.on('value', snap => {
// render data to HTML
})
attendees.on('child_added', snap => {
// append attendees to list
})
//querying
//select a user by UID
const oneRef = rootRef.child('users').child('1')
// Find a user by email address
const twoRef = rootRef.child('users').orderByChild('email').equalTo('[email protected]')
//limit to 10 users
const threeRef = rootRef.child('users').limitToFirst(10)
//get all users name that start with d
const fourRef = rootRef.child('users').orderByChild('age').startAt(51)
//joining tables in database
const rootRef = firebase.database().ref()
const attendees = db.child('eventAttendees/fm')
attendees.on('child_added', snap => {
// append attendees to list
// '1' -> 'David'
let userRef = db.child('users/' + snap.key);
userRef.once('value'). then(userSnap => {
// anything you want to do with the users
})
})
//to get all the attendees at a specific event
const eventKey = '-katakjsdflja'
const rootRef = firebase.database().ref()
const attendeesRef = rootRef.child('eventAttendees')
const usersRef = rootRef.child('users')
function getUsersAtEvent(key, cb) {
attendeesRef.child(key).on('child_added', snap => {
let userRef = usersRef.child(snap.key)
userRef.once('value', cb)
})
}
getUsersAtEvent(eventKey, snap => console.log(snap.val()));