34 catalog pagination backend

common/utils.js

@@ -20,6 +20,11 @@ const isISODate = (str) => {
   }
 };
 
+// dependency for catalog.js
+const isInteger = (value) => {
+  return value && /^\d+$/.test(value);
+};
+
 const isObject = (o) => {
   return o === Object(o) && !isArray(o) && typeof o !== 'function' && !isISODate(o);
 };
@@ -52,4 +57,4 @@ const keysToCamel = (data) => {
   return data;
 };
 
-module.exports = { keysToCamel };
+module.exports = { keysToCamel, isInteger };

routes/catalog.js

@@ -1,15 +1,20 @@
 const express = require('express');
-
 const { db } = require('../server/db');
 
 const catalogRouter = express.Router();
-const { keysToCamel } = require('../common/utils');
+const { keysToCamel, isInteger } = require('../common/utils');
 
 // -- GET - Returns all data from the catalog table
 catalogRouter.get('/', async (req, res) => {
   try {
-    const allInfo = await db.query(`SELECT * from catalog;`);
-    res.status(200).json(keysToCamel(allInfo));
+    let { limit, page } = req.query;
+    limit = isInteger(limit) ? parseInt(limit, 10) : 10;
+    page = isInteger(page) ? parseInt(page, 10) : 1;
+
+    const offset = (page - 1) * limit;
+    const allInfo = await db.query(`SELECT * from catalog LIMIT $1 OFFSET $2;`, [limit, offset]);
+    const eventCount = await db.query(`SELECT COUNT(DISTINCT id) from catalog;`);
+    res.status(200).json(keysToCamel({ events: allInfo, count: eventCount }));
   } catch (err) {
     res.status(500).send(err.message);
   }