How to Select a Random Product from a Firebase Database in Node.js?

How to retrieve a unique random product from a Firebase database in Node.js:

In this context, we aim to retrieve a single, random product from a node named "products" in a Firebase database. Here are two approaches:

Classic Approach:

This involves retrieving all product records from the "products" node and selecting a random one:

const rootRef = firebase.database().ref();
const productsRef = rootRef.child("products");

// Listen for a single snapshot of the products node
productsRef.once('value').then((snapshot) => {
  // Get all product names
  const productNames = [];
  snapshot.forEach((child) => {
    productNames.push(child.val().name);
  });

  // Select a random product name
  const randomProductName = productNames[Math.floor(Math.random() * productNames.length)];

  // Get the specific product data using the random name
  rootRef.child(`products/${randomProductName}`).once('value').then((product) => {
    console.log(product.val());
  });
});

Denormalized Approach:

In this technique, we create a separate node called "productIds" that contains only the IDs of all products. This allows us to retrieve a random product ID without fetching all product records:

const rootRef = firebase.database().ref();
const productIdsRef = rootRef.child("productIds");

// Listen for a single snapshot of the productIds node
productIdsRef.once('value').then((snapshot) => {
  // Get all product IDs
  const productIds = Object.keys(snapshot.val());

  // Select a random product ID
  const randomProductId = productIds[Math.floor(Math.random() * productIds.length)];

  // Get the specific product data using the random ID
  rootRef.child(`products/${randomProductId}`).once('value').then((product) => {
    console.log(product.val());
  });
});

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