Add pagination to get multiple quotes

helper.js

@@ -0,0 +1,15 @@
+function getOffset(currentPage = 1, listPerPage) {
+  return (currentPage - 1) * [listPerPage];
+}
+
+function emptyOrRows(rows) {
+  if (!rows) {
+    return [];
+  }
+  return rows;
+}
+
+module.exports = {
+  getOffset,
+  emptyOrRows
+}

routes/quotes.js

@@ -5,7 +5,7 @@ const quotes = require('../services/quotes');
 /* GET quotes listing. */
 router.get('/', async function(req, res, next) {
   try {
-    res.json(await quotes.getMultiple());
+    res.json(await quotes.getMultiple(req.query.page));
   } catch (err) {
     console.error(`Error while getting quotes `, err.message);
     next(err);

services/quotes.js

@@ -1,8 +1,15 @@
-const db = require('../services/db');
+const db = require('./db');
+const helper = require('../helper');
+const config = require('../config');
 
-async function getMultiple(){
-  const data = await db.query('SELECT id, quote, author FROM quote');
-  const meta = {page: 1};
+async function getMultiple(page = 1){
+  const offset = helper.getOffset(page, config.listPerPage);
+  const rows = await db.query(
+    'SELECT id, quote, author FROM quote LIMIT ?,?', 
+    [offset, config.listPerPage]
+  );
+  const data = helper.emptyOrRows(rows);
+  const meta = {page};
 
   return {
     data,