Develop Reference

Consuming data of restAPI using Node

I am calling below restAPI using node JS.
I am using below code.
var Request = require("request");
Request.get("http://localhost:8080/ords/hr/rest-v3/item/Sugar", (error, response, body) => {
if (error) {
return console.dir(error);
}
console.log(response.body);
});
It is giving below output which is correct.
{"items":[{"itemid":101,"itemname":"Sugar","itemcost":32.5}],"hasMore":false,"limit":0,"offset":0,"count":1,"links":[{"rel":"self","href":"http://localhost:8080/ords/hr/rest-v3/item/Sugar"},{"rel":"describedby","href":"http://localhost:8080/ords/hr/metadata-catalog/rest-v3/item/item"}]}
How can I access only itemcost, not entire body. I am new to node so not familiar with many things.
Can you please help me on that.

May be it can help you.
var Request = require("request");
Request.get("http://localhost:8080/ords/hr/rest-v3/item/Sugar", (error, response, body) => {
if (error) {
return console.dir(error);
}
let jsonData = JSON.parse(response.body);
let obj= new Object(jsonData);
obj.items.forEach(itemChild => {
let cost=itemChild.itemcost;
console.log(cost);
})
});

you can iterate the response.body.items and get the costs of all items in the items array like this,
var Request = require("request");
Request.get("http://localhost:8080/ords/hr/rest-v3/item/Sugar", (error, response, body) => {
if (error) {
return console.dir(error);
}
console.log(response.body);
const itemCosts = response.body.items.map(item => item.itemcost);
console.log(itemCosts);
});

Considering your input you can simply do this:
let input = {
"items": [
{
"itemid": 101,
"itemname": "Sugar",
"itemcost": 32.5
}
],
"hasMore": false,
"limit": 0,
"offset": 0,
"count": 1,
"links": [
{
"rel": "self",
"href": "http://localhost:8080/ords/hr/rest-v3/item/Sugar"
},
{
"rel": "describedby",
"href": "http://localhost:8080/ords/hr/metadata-catalog/rest-v3/item/item"
}
]
};
let json = JSON.parse(JSON.stringify(input));
json.items.map(item =>{
console.log(item.itemcost)
})
You can find running solution here

Conditional update to dynamoDB with nested object using node.js

I'm trying to update 3 nested items in a db table,my lambda runs fine and doesnt give any erros,but when a query the table it doesnt show the new values,i´m not sure if im invoking the table or passing the arguments correctly
my partion key/primary key is badgeNumber
my dynamoDB table looks like this:
(the items i'm trying to update are date,hour,register to yyy-mm-dd,hh-mm-ss and true
{
"assistance": [
{
"date": "null",
"hour": "null",
"register": false
}
],
"badgeNumber": "0000",
"data": {
"cardType": "elem",
"firstName": "Moriuks",
"imageURL": "url",
"lastName": "Mora",
"position": "Student"
}
}
the condition to update the items is if register is = false then write the new values to the table.
my code looks like this
pppp
var updateAsisstance = function(day,hour,id){
var docClient = new AWS.DynamoDB.DocumentClient();
var params = {
TableName:"someTable",
Key: { badgeNumber : 0000 },
UpdateExpression: "SET #asi[0].#reg = :locVal",
ExpressionAttributeNames: {
'#asi': 'asisstance',
'#reg': 'register',
},
ConditionExpression: "NE(#asi[0].#reg:true)",
ExpressionAttributeValues:{
":date":day,
":hour":hour,
":locVal":true
},
ReturnValues:"UPDATED_NEW"
};
docClient.update(params, function(err, data) {
if (err) {
console.log("Error", err);
} else {
console.log("Success", data);
}
});
};
after defining the funcion,im calling it using
updateAssistance(day,hour,id)
the expected output should look something like this:
"assistance": [
{
"date": "yyyy-MM-DD",
"hour": "HH-MM-SS",
"register": true
}
],

i solved it changing the code,also,my condition expression was wrong...here is what it looks like.
'use strict';
const AWS = require('aws-sdk');
var today = new Date();
var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
var hour = (today.getHours()-5) + ":" + today.getMinutes() + ":" + today.getSeconds();
exports.handler = async (event,context) => {
const documentClient = new AWS.DynamoDB.DocumentClient();
let responseBody = "";
let statusCode = 0;
var params = {
TableName:"SomeTable",
Key: { badgeNumber : '0000' },
UpdateExpression: "set assistance[0].register = :n,assistencia[0].date = :date,assistencia[0].hour = :hour",
ExpressionAttributeNames: {
'#asi': 'assistance',
'#reg': 'register'
},
ConditionExpression: "(#asi[0].#reg = :p)",
ExpressionAttributeValues:{
":n":true,
":p":false,
":date":date,
":hour":hour
},
ReturnValues:"UPDATED_NEW"
}
try {
const data = await documentClient.update(params).promise();
responseBody = JSON.stringify(data);
statusCode = 204;
} catch (err) {
responseBody = `Unable to update product: ${err}`;
statusCode = 403;
}
const response = {
statusCode: statusCode,
headers: {
"Content-Type": "application/json"
},
body:responseBody
}
return response
}
this changes the nested values inside my dynamoDB table,if you dont have any its pretty straight forward.

node for loop keep looping

I use request to read a website then parseString to convert and later save as json. The problem is saving. Looks like "for loop" keeps looping and when is saving the information uses the last info from var cta to assign to information. I have try asyn await but it didnt work. thanks in advance.
var fs = require('fs');
var request = require('request');
var parseString = require('xml2js').parseString;
var json = {} ;
var cta = [
{
"_id": 1,
"name": "PRWeb",
"feedtype": "Misc",
"feedaddress": "https://www.prweb.com/rss2/daily.xml",
"status": true
},
{
"_id": 2,
"name": "Business Wire",
"feedtype": "Industrie",
"feedaddress": "https://feed.businesswire.com/rss/home/?rss=G1QFDERJXkJeGVtRVQ==",
"status": false
},
{
"_id": 3,
"name": "News Wire",
"feedtype": "Daily News",
"feedaddress": "https://www.newswire.com/newsroom/rss/custom/all-press-releases",
"status": true
}
];
for (var i = 0; i < cta.length; i++) {
function getDatos(url, callback) {
request(url, function(error, response, data){
callback(error, response, data);
});
}
if (cta[i].status === true) {
console.log("cta: " + cta[i].feedaddress);
agrabar = cta[i];
console.log("agrabar: " + agrabar.feedaddress);
getDatos(agrabar.feedaddress, function(error, response, data){
parseString(data, {explicitArray: false}, function (err, result) {
if (err) {
return console.log('unable to parse XML');
}
json = {rssfeeder: agrabar, feed: result.rss.channel.item};
console.log(json);
fs.appendFile ("output.json", JSON.stringify(json, null, 4), function(err) {
if (err) throw err;
console.log('complete');
});
});
});
}
}
console.log('DONE!!!')

You seem to be mixing asynchronous code with synchronous code. It'd be great if you read more about how (and in what order) callbacks are handled in Javascript.
Example : Your final line of code console.log('DONE!!!') should actually be printed at the last when everything has finished, but when you'll run it, you'll be surprised that it's actually the first line to be printed to console. This is because the function getDatos is an asynchronous function, meaning that it will execute at some later point in time. Your for loop executes synchronously meaning that getDatos will be called thrice in the correct order, but owing to function closure in JS and asynchronicity, getDatos will be called after your final console.log has been done.
Furthermore, it's a good practice to use async await and Promises in modern JS, since it makes reading the code much more easier. I have modified your code to do what you intend to do and here it is. Hope it helps!
var fs = require('fs');
var request = require('request');
var parseString = require('xml2js').parseString;
var cta = [
{
"_id": 1,
"name": "PRWeb",
"feedtype": "Misc",
"feedaddress": "https://www.prweb.com/rss2/daily.xml",
"status": true
},
{
"_id": 2,
"name": "Business Wire",
"feedtype": "Industrie",
"feedaddress": "https://feed.businesswire.com/rss/home/?rss=G1QFDERJXkJeGVtRVQ==",
"status": false
},
{
"_id": 3,
"name": "News Wire",
"feedtype": "Daily News",
"feedaddress": "https://www.newswire.com/newsroom/rss/custom/all-press-releases",
"status": true
}
];
function getDatos(cta_object) {
if (cta_object.status === false){
return new Promise((resolve, reject) => resolve(false));
}
else {
return new Promise((resolve, reject) => {
request(cta_object.feedaddress, (err, response, data) => {
if (err) reject(err);
else resolve(data);
})
})
.then((data) => {
return new Promise((resolve, reject) => {
parseString(data, {explicitArray: false}, (err, result) => {
if (err) {
console.error("Unable to parse XML!");
return reject(err);
}
else return resolve(result);
});
})
})
.then((result) => {
console.log(result);
return {
'rssfeeder': cta_object,
'feed': result.rss.channel.item
};
})
.then((json) => {
return new Promise((resolve, reject) => {
fs.appendFile ("output.json", JSON.stringify(json, null, 4), function(err) {
if (err) reject(err) ;
console.log("complete!");
resolve(true);
});
})
})
.catch((err) => {
throw(err);
})
}
};
Promise.all(cta.map((cta_obj) => getDatos(cta_obj)))
.then(() => console.log('DONE!!!'))
.catch((err) => {
throw err;
})

how to get key value pair from body object in javascript while using request module

I am creating an application in which I want to use some data from a JSON, which is generated by another js file. Here is the code which is generating JSON
var request = require('request');
module.exports = {
foo:
request('https://westus.api.cognitive.microsoft.com/luis/v2.0/apps/c1d1e5d6-fe5c-42de-8713-60f272a3b63e?subscription-key=d3d3e4dfa8744be9b4ae47558df8fc5a&timezoneOffset=0&verbose=true&q=hey',function (error, response, body) {
console.log('error:', error); // Print the error if one occurred
console.log('statusCode:', response && response.statusCode); // Print the response status code if a response was received
console.log(body);
})
};
I am interested in body object, which is giving following contents -
{
"query": "hey",
"topScoringIntent": {
"intent": "Help",
"score": 0.500165462
},
"intents": [
{
"intent": "Help",
"score": 0.500165462
},
{
"intent": "None",
"score": 0.10364107
},
{
"intent": "SearchHotels",
"score": 0.00249445555
},
{
"intent": "ShowHotelsReviews",
"score": 9.451727E-06
}
],
"entities": []
}
Now I want to access value of intent from topScoringIntent element. That to in another JS file. I tried using body[1].intend but it gives undefined.
I am very new to javascript and need very basic code to do this. Please give some suggestions on this. Also plz tell me if this can be solved by body-parser and if yes then how?
Update - Here is the code where I want to use body['topScoringIntent'].intent as global.
require('dotenv-extended').load();
var builder = require('botbuilder');
var restify = require('restify');
var Store = require('./store');
var spellService = require('./spell-service');
var request = require('request');
var myJSON = require("JSON");
var fs = require('fs');
//var window = window;
var request = require("request");
var myJSON = require("JSON");
var globalVar = [];
// Setup Restify Server
var server = restify.createServer();
server.listen(process.env.port || process.env.PORT || 3978, function () {
console.log('%s listening to %s', server.name, server.url);
});
// Create connector and listen for messages
var connector = new builder.ChatConnector({
appId: process.env.MICROSOFT_APP_ID,
appPassword: process.env.MICROSOFT_APP_PASSWORD
});
server.post('/api/messages', connector.listen());
function getMyBody(url, callback) {
request({
url: 'https://westus.api.cognitive.microsoft.com/luis/v2.0/apps/c1d1e5d6-fe5c-42de-8713-60f272a3b63e?subscription-key=d3d3e4dfa8744be9b4ae47558df8fc5a&timezoneOffset=0&verbose=true&q=hey',
json: true
}, function (error, response, body) {
if (error || response.statusCode !== 200) {
return callback(error || {statusCode: response.statusCode});
}
global.topScoringIntent = body['topScoringIntent'].intent;
//if(body['topScoringIntent'].intent == 'Help');
//console.log('yay');
callback(null, body);
});
}
getMyBody('https://westus.api.cognitive.microsoft.com/luis/v2.0/apps/c1d1e5d6-fe5c-42de-8713-60f272a3b63e?subscription-key=d3d3e4dfa8744be9b4ae47558df8fc5a&timezoneOffset=0&verbose=true&q=hey', function(err, body) {
if (err) {
console.log(err);
}
})
if(body['topScoringIntent'].intent == 'Help');
console.log('success');

This should work for you
console.log(response.topScoringIntent.intent);

body.topScoringIntent.intent will return 'Help'.
To use it globally you can set a var :
var body = {
"query": "hey",
"topScoringIntent": {
"intent": "Help",
"score": 0.500165462
},
"intents": [
{
"intent": "Help",
"score": 0.500165462
},
{
"intent": "None",
"score": 0.10364107
},
{
"intent": "SearchHotels",
"score": 0.00249445555
},
{
"intent": "ShowHotelsReviews",
"score": 9.451727E-06
}
],
"entities": []
}
var result = body.topScoringIntent.intent;
And then use result somewhere else :
console.log(result);

Using async.js for deep populating sails.js

I have a big issue with my function in sails.js (v12). I'm trying to get all userDetail using async (v2.3) for deep populating my user info:
UserController.js:
userDetail: function (req, res) {
var currentUserID = authToken.getUserIDFromToken(req);
async.auto({
//Find the User
user: function (cb) {
User
.findOne({ id: req.params.id })
.populate('userFollowing')
.populate('userFollower')
.populate('trips', { sort: 'createdAt DESC' })
.exec(function (err, foundedUser) {
if (err) {
return res.negotiate(err);
}
if (!foundedUser) {
return res.badRequest();
}
// console.log('foundedUser :', foundedUser);
cb(null, foundedUser);
});
},
//Find me
me: function (cb) {
User
.findOne({ id: currentUserID })
.populate('myLikedTrips')
.populate('userFollowing')
.exec(function (err, user) {
var likedTripIDs = _.pluck(user.myLikedTrips, 'id');
var followingUserIDs = _.pluck(user.userFollowing, 'id');
cb(null, { likedTripIDs, followingUserIDs });
});
},
populatedTrip: ['user', function (results, cb) {
Trip.find({ id: _.pluck(results.user.trips, 'id') })
.populate('comments')
.populate('likes')
.exec(function (err, tripsResults) {
if (err) {
return res.negotiate(err);
}
if (!tripsResults) {
return res.badRequest();
}
cb(null, _.indexBy(tripsResults, 'id'));
});
}],
isLiked: ['populatedTrip', 'me', 'user', function (results, cb) {
var me = results.me;
async.map(results.user.trips, function (trip, callback) {
trip = results.populatedTrip[trip.id];
if (_.contains(me.likedTripIDs, trip.id)) {
trip.hasLiked = true;
} else {
trip.hasLiked = false;
}
callback(null, trip);
}, function (err, isLikedTrip) {
if (err) {
return res.negotiate(err);
}
cb(null, isLikedTrip);
});
}]
},
function finish(err, data) {
if (err) {
console.log('err = ', err);
return res.serverError(err);
}
var userFinal = data.user;
//userFinal.trips = data.isLiked;
userFinal.trips = "test";
return res.json(userFinal);
}
);
},
I tried almost everthing to get this fix but nothing is working...
I am able to get my array of trips(data.isLiked) but I couldn't get my userFInal trips.
I try to set string value on the userFinal.trips:
JSON response
{
"trips": [], // <-- my pb is here !!
"userFollower": [
{
"user": "5777fce1eeef472a1d69bafb",
"follower": "57e44a8997974abc646b29ca",
"id": "57efa5cf605b94666aca0f11"
}
],
"userFollowing": [
{
"user": "57e44a8997974abc646b29ca",
"follower": "5777fce1eeef472a1d69bafb",
"id": "5882099b9c0c9543706d74f6"
}
],
"email": "test2#test.com",
"userName": "dany",
"isPrivate": false,
"bio": "Hello",
"id": "5777fce1eeef472a1d69bafb"
}
Question
How should I do to get my array of trips (isLiked) paste to my user trips array?
Why my results is not what I'm expecting to have?
Thank you for your answers.

Use .toJSON() before overwriting any association in model.
Otherwise default toJSON implementation overrides any changes made to model associated data.
var userFinal = data.user.toJSON(); // Use of toJSON
userFinal.trips = data.isLiked;
return res.json(userFinal);
On another note, use JS .map or _.map in place of async.map as there is not asynchronous operation in inside function. Otherwise you may face RangeError: Maximum call stack size exceeded issue.
Also, it might be better to return any response from final callback only. (Remove res.negotiate, res.badRequest from async.auto's first argument). It allows to make response method terminal