data-insertion.js

var firebase = require('firebase');

firebase.initializeApp({
    apiKey: "AIzaSyAK3W-9RTSSVJw579ZJaC0F7ZkxJZo7x2Y",
    authDomain: "bzorder01.firebaseapp.com",
    databaseURL: "https://bzorder01.firebaseio.com",
    projectId: "bzorder01",
    storageBucket: "bzorder01.appspot.com",
    messagingSenderId: "1032338270823"
})

let rootRef = firebase.database().ref();

// rootRef.child('categories').set({
//     "0": "Food",
//     "1": "Bakery Item",
//     "2": "Grocey",
//     "3": "Sweets"
// })
// 
// let ids = [];
// 
for (let i = 0; i < 10; i++) {
    rootRef.child('vendors').push({
        "name": "vendor " + i,
        "description": "vendor " + i + " description",
        "loaction": 'abc' + i,
        "category_id": i % 4,
        "image": "defualt-vendor.png"
    });
}

rootRef.child('vendors').once('value').then((data) => {
    let vendors = data.val();
    let ids = Object.keys(vendors);
    for (let i = 0; i < 25; i++) {
        rootRef.child('items').push({
            "name": "Item " + i,
            "description": "Item " + i + " description",
            "price": 10 + i,
            "vendor_id": ids[i % ids.length],
            "image": "defualt-item.png"
        });
    }
});

// rootRef.child('deals').set([
//     {
//         "name": "deals 1",
//         "description": "20% off on item xyz",
//         "items": [{
//             "description": "Item 10 description",
//             "id": "-L2pw9fq6Y_5cnQSOQmz",
//             "image": "defualt-item.jpg",
//             "name": "Item 10",
//             "price": 20,
//             "quantity": 1,
//             "vendor_id": "-L2pw9Or0liHyUFG3g50"
//         }]
//     },
//     {
//         "name": "deals 2",
//         "description": "10% off on item xyz",
//         "items": [{
//             "description": "Item 10 description",
//             "id": "-L2pw9fq6Y_5cnQSOQmz",
//             "image": "defualt-item.jpg",
//             "name": "Item 10",
//             "price": 20,
//             "quantity": 1,
//             "vendor_id": "-L2pw9Or0liHyUFG3g50"
//         }]
//     }
// ])