Search pagination

index.js

@@ -16,8 +16,6 @@ const dotenvExpand = require('dotenv-expand');
 let dotenvConf = dotenv.config();
 dotenvExpand(dotenvConf);
 
-console.log(process.env);
-
 app.use(compression());
 app.use(bodyParser.json());
 app.use(expressMongoDb(process.env.MONGO_CONNECTION_STRING));

migration.js

@@ -0,0 +1,27 @@
+const MongoClient = require('mongodb').MongoClient;
+const dotenv = require('dotenv');
+const dotenvExpand = require('dotenv-expand');
+
+let dotenvConf = dotenv.config();
+dotenvExpand(dotenvConf);
+
+async function addUpdatedDate() {
+	let client = await MongoClient.connect(process.env.MONGO_CONNECTION_STRING, { useUnifiedTopology: true });
+	let db = client.db('autocatdev');
+	let collection = db.collection('vehicles');
+	let vehicles = await collection.find().toArray();
+	for(let vehicle of vehicles) {
+		let updatedDate = vehicle.addedDate;
+		if(vehicle.events.length > 0) {
+			let lastEvent = vehicle.events.reduce((acc, cur) => acc.date > cur.date ? acc : cur);
+			updatedDate = Math.max(1000*lastEvent.date, vehicle.addedDate);
+		}
+		console.log(updatedDate);
+		await collection.updateOne({ _id: vehicle._id }, { $set: { updatedDate } });
+	}
+}
+
+(async () => {
+	await addUpdatedDate();
+	console.log('====== Done ======');
+})();

models/vehicle.js

@@ -59,6 +59,7 @@ class Vehicle {
 		
 		v.isJapanese = report.is_japanese_vehicle;
 		v.addedDate = Date.now();
+		v.updatedDate = v.addedDate;
 		v.events = [];
 
 		v.debugInfo = {
@@ -102,6 +103,7 @@ class Vehicle {
 		});
 
 		v.addedDate = Date.now();
+		v.updatedDate = v.addedDate;
 		v.events = [];
 
 		v.debugInfo = {
@@ -163,6 +165,7 @@ class Vehicle {
 		});
 
 		v.addedDate = Date.now();
+		v.updatedDate = v.addedDate;
 		v.events = [];
 
 		v.debugInfo = {

package.json

@@ -4,7 +4,8 @@
   "description": "AutoCat app backend",
   "main": "index.js",
   "scripts": {
-    "server": "node --async-stack-traces --trace-warnings index.js",
+	"server": "node --async-stack-traces --trace-warnings index.js",
+	"migration": "node --async-stack-traces --trace-warnings migration.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "Selim Mustafaev",

routes/events.js

@@ -12,6 +12,7 @@ router.post('/', async (req, res) => {
 		event.id = uuidv4();
 		let collection = req.db.collection('vehicles');
 		await collection.updateOne({ number }, { $push: { events: event } });
+		await collection.updateOne({ number }, { $set: { updatedDate: Date.now() } });
 		let vehicle = await collection.findOne({ number });
 		if(vehicle) {
 			res.send({ success: true, data: vehicle });
@@ -34,7 +35,7 @@ router.delete('/', async (req, res) => {
 			let index = vehicle.events.findIndex(e => e.id == eventId);
 			if(index >= 0) {
 				vehicle.events.splice(index, 1);
-				await collection.updateOne({ number: vehicle.number }, { $set: { events: vehicle.events } });
+				await collection.updateOne({ number: vehicle.number }, { $set: { events: vehicle.events, updatedDate: Date.now() } });
 			}
 			res.send({ success: true, data: vehicle });
 		} else {
@@ -56,7 +57,7 @@ router.put('/', async (req, res) => {
 			let index = vehicle.events.findIndex(e => e.id == event.id);
 			if(index >= 0) {
 				vehicle.events[index] = event;
-				await collection.updateOne({ number: vehicle.number }, { $set: { events: vehicle.events } });
+				await collection.updateOne({ number: vehicle.number }, { $set: { events: vehicle.events, updatedDate: Date.now() } });
 				res.send({ success: true, data: vehicle });
 			} else {
 				res.send(makeError('Event not found'));

routes/vehicles.js

@@ -8,6 +8,7 @@ const { regions } = require('../data_providers/constants');
 const RsaProvider = require('../data_providers/rsa');
 const NomerogramProvider = require('../data_providers/nomerogram');
 const Utils = require('../utils');
+const ObjectId = require('mongodb').ObjectID;
 
 const makeError = error => ({ success: false, error });
 
@@ -81,6 +82,7 @@ router.post('/check', async (req, res) => {
 
 			// In case of force update of existing vehicle, transfer all events to the new DB record
 			if (vehicles.length > 0) {
+				vehicle.addedDate = vehicles[0].addedDate;
 				vehicle.events = vehicles[0].events;
 				vehicle.osagoContracts = vehicles[0].osagoContracts;
 			}
@@ -95,14 +97,35 @@ router.post('/check', async (req, res) => {
 });
 
 router.get('/', async (req, res) => {
-	const { limit } = req.query;
 	const { email } = req.user;
+	const { pageToken } = req.query;
+	const pageSize = 50;
 
 	try {
 		let finalQuery = Utils.makeVehiclesSearchQuery(req.query, email);
 		let collection = req.db.collection('vehicles');
-		let vehicles = await collection.find(finalQuery).sort({ addedDate: -1 }).limit(parseInt(limit ?? 0)).toArray();
+
-		res.send({ success: true, data: vehicles });
+		let response = {};
+		if(!pageToken) {
+			response.count = await collection.countDocuments(finalQuery);
+		} else {
+			let lastVehicle = await collection.findOne({ _id: ObjectId(pageToken) });
+			finalQuery.$or = [
+				{ updatedDate: { $lt: lastVehicle.updatedDate } },
+				{ 
+					updatedDate: lastVehicle.updatedDate,
+					_id: { $lt: ObjectId(pageToken) }
+				}
+			];
+		}
+
+		let vehicles = await collection.find(finalQuery).sort({ updatedDate: -1 }).limit(pageSize).toArray();
+		if(vehicles.length == pageSize) {
+			response.pageToken = vehicles[vehicles.length - 1]._id;
+		}
+		response.items = vehicles;
+
+		res.send({ success: true, data: response });
 	} catch(ex) {
 		res.send(makeError('Error reading vehicles from DB'));
 		console.error(ex);