I am developing a application in Node.js with use of mongodb and mongoose. I want to get the index of object from array of object returned by mongoose the data is given below, how can I get the index from details Array where record contains particular id like
_id: 5334032ad1c4d2d616ad3a47
The actual problem is that I am rendering a page which shows data of single nested record of details record, the id of that record is contained in my url like this
http://localhost:3000/id-of-parent-course/id-of-nested-doc-in-details
I am passing all the data to that page because I want to access the total count of details record, may be my way of doing this is wrong you can correct me with answer
course:
{ __v: 1,
_id: 5334032ad1c4d2d616ad3a46,
updatedAt: Fri Mar 28 2014 13:14:07 GMT+0530 (IST),
createdAt: Thu Mar 27 2014 16:23:30 GMT+0530 (IST),
comments: [],
details:
[ { status: 'Core',
course_type: 'New',
_id: 5334032ad1c4d2d616ad3a47,
books: [Object],
course_content: [Object],
learning_outcomes: [Object],
objectives: [Object],
senate_approval_on: Fri Mar 14 2014 00:00:00 GMT+0530 (IST),
ac_approval_on: Wed Mar 19 2014 00:00:00 GMT+0530 (IST),
center_approval_on: Wed Mar 12 2014 00:00:00 GMT+0530 (IST),
focus_group_approval_on: Tue Mar 11 2014 00:00:00 GMT+0530 (IST),
effect_from: Tue Apr 01 2014 00:00:00 GMT+0530 (IST),
pre_requisite: 'Javascript',
offered_for: 'B.Tech',
structure: [Object],
department: 'ICT',
course_no: 12345,
title: 'Course 1' },
{ status: 'Core',
course_type: 'New',
_id: 533528472ad1706170b502b0,
books: [Object],
course_content: [Object],
learning_outcomes: [Object],
objectives: [Object],
senate_approval_on: Fri Mar 14 2014 00:00:00 GMT+0530 (IST),
ac_approval_on: Wed Mar 19 2014 00:00:00 GMT+0530 (IST),
center_approval_on: Wed Mar 12 2014 00:00:00 GMT+0530 (IST),
focus_group_approval_on: Tue Mar 11 2014 00:00:00 GMT+0530 (IST),
effect_from: Tue Apr 01 2014 00:00:00 GMT+0530 (IST),
pre_requisite: 'Javascript',
offered_for: 'B.Tech',
structure: [Object],
department: 'ICT',
course_no: 12345,
title: 'Course 1' } ] } }
You'll have to iterate over the array and keep the index, like:
var i=0,
found=false;
for(i = 0; i < course.details.length; i++) {
var detail = course.details[i];
if(detail._id === idYouReSearchingFor) {
found=true;
break;
}
}
if(found) //your index is on variable i
Related
I have two user objects:
const user = {
startDate: new Date('2022-10-06'),
endDate: new Date('2022-10-10'),
id:'1234',
title: 'Title 1'
};
const user2 = {
startDate: new Date('2022-10-12'),
endDate: new Date('2022-10-17'),
id: '1112',
title: 'Title 2'
};
and an array with these two objects and an empty object called dateToUserMap:
const users = [user, user2];
const dateToUserMap = {};
I want to add data to dateToUserMap and it needs to look like this:
dateToUserMap = {
'01.11.2022': [
{
id: 'asd',
title: 'asd'
}
],
'02.11.2022': [
{
id: 'asd',
title: 'asd'
},
{
id: 'asd1',
title: 'asd1'
}
],
'03.11.2022': [
{
id: 'asd1',
title: 'asd1'
}
]
};
dateToUserMap should be an object with the days of the intervals of each user in chronological order (in my case should be days from 10/6 until 10/10 and 10/12 until 10/17), and each day should have an array of objects with the id and title of the users in that interval.
I tried using forEach to loop trough the users in the users array and calculated the interval of each user but I don't know how to pass that data in the object with all the dates and the id and title
users.forEach(user => {
const interval = eachDayOfInterval({ start: user.startDate, end: user.endDate });
console.log(interval);
});
I use date-fns library to help me work with dates and when I log the interval to console I get this:
(6) [Wed Oct 12 2022 00:00:00 GMT+0300 (Eastern European Summer Time), Thu Oct 13 2022 00:00:00 GMT+0300 (Eastern European Summer Time), Fri Oct 14 2022 00:00:00 GMT+0300 (Eastern European Summer Time), Sat Oct 15 2022 00:00:00 GMT+0300 (Eastern European Summer Time), Sun Oct 16 2022 00:00:00 GMT+0300 (Eastern European Summer Time), Mon Oct 17 2022 00:00:00 GMT+0300 (Eastern European Summer Time)]
0
:
Wed Oct 12 2022 00:00:00 GMT+0300 (Eastern European Summer Time) {}
1
:
Thu Oct 13 2022 00:00:00 GMT+0300 (Eastern European Summer Time)
[[Prototype]]
:
Object
2
:
Fri Oct 14 2022 00:00:00 GMT+0300 (Eastern European Summer Time) {}
3
:
Sat Oct 15 2022 00:00:00 GMT+0300 (Eastern European Summer Time) {}
4
:
Sun Oct 16 2022 00:00:00 GMT+0300 (Eastern European Summer Time) {}
5
:
Mon Oct 17 2022 00:00:00 GMT+0300 (Eastern European Summer Time) {}
length
:
6
[[Prototype]]
:
Array(0)
I need to get my data ordered by date and events but I'm struggling to get it working using AlaSQL query on Date objects:
function testOrderBy() {
var data = [{event:'A', date: new Date('2021-04-21')},
{event:'B', date: new Date('2021-04-21')},
{event:'C', date: new Date('2021-04-21')},
{event:'D', date: new Date('2021-04-20')}];
console.log(data);
var res = alasql(`SELECT event, date FROM ? ORDER BY date, event`, [data]);
console.log(res);
}
And the result obtained is:
[ { event: 'D',
date: Tue Apr 20 2021 02:00:00 GMT+0200 (Central European Summer Time) },
{ event: 'C',
date: Wed Apr 21 2021 02:00:00 GMT+0200 (Central European Summer Time) },
{ event: 'B',
date: Wed Apr 21 2021 02:00:00 GMT+0200 (Central European Summer Time) },
{ event: 'A',
date: Wed Apr 21 2021 02:00:00 GMT+0200 (Central European Summer Time) } ]
I was expecting:
[ { event: 'D',
date: Tue Apr 20 2021 02:00:00 GMT+0200 (Central European Summer Time) },
{ event: 'A',
date: Wed Apr 21 2021 02:00:00 GMT+0200 (Central European Summer Time) },
{ event: 'B',
date: Wed Apr 21 2021 02:00:00 GMT+0200 (Central European Summer Time) },
{ event: 'C',
date: Wed Apr 21 2021 02:00:00 GMT+0200 (Central European Summer Time) } ]
The problem does not occur if dates are not Date objects but ISO strings:
function testOrderBy() {
var data = [{event:'A', date: '2021-04-21'},
{event:'B', date: '2021-04-21'},
{event:'C', date: '2021-04-21'},
{event:'D', date: '2021-04-20'}];
console.log(data);
var res = alasql(`SELECT event, date FROM ? ORDER BY date, event`, [data]);
console.log(res);
}
The result is as expected D, A, B, C
Any idea ?
It is necessary to create the table schema to correctly consider the column as a Date type, as follows:
alasql("CREATE TABLE events (event string, date date)");
alasql.tables.events.data = [{event:'A', date: new Date('2021-04-21')},
{event:'B', date: new Date('2021-04-21')},
{event:'C', date: new Date('2021-04-21')},
{event:'D', date: new Date('2021-04-20')}];
alasql(`SELECT event, date INTO HTML("#res") FROM events ORDER BY date, event`);
<script src="https://cdn.jsdelivr.net/npm/alasql#1.7.3/dist/alasql.min.js"></script>
<div id="res">
</div>
I have an array of Javascript Objects, which contain two important values date and status
I want to reduce them into an array of unique dates, where all the values are parsed into an object, that contains each of the status and the date.
I have tried using the reduce funtion, but i can't seem to collect the dates properly, so that all the data is collected properly.
The unique statuses are: "System Labelled", "Discarded", "Saved", "Reviewed"
So for example:
[{status: "System Labelled", date: Thu Mar 05 2020 01:00:00 GMT+0100 (Central European Standard Time)},
{status: "System Labelled", date: Thu Mar 05 2020 01:00:00 GMT+0100 (Central European Standard Time)},
{status: "System Labelled", date: Thu Mar 05 2020 02:00:00 GMT+0200 (Central European Summer Time)},
{status: "Discarded", date: Tue Mar 10 2020 01:00:00 GMT+0100 (Central European Standard Time)},
{status: "Saved", date: Sat Jan 11 2020 01:00:00 GMT+0100 (Central European Standard Time)}]
---->
[{System Labelled: 1, Discarded: 0, Saved: 0, Reviwed: 0, date: Thu Mar 05 2020 01:00:00 GMT+0100 (Central European Standard Time)},
{System Labelled: 2, Discarded: 0, Saved: 0, Reviwed: 0, date: Sun Apr 05 2020 02:00:00 GMT+0200 (Central European Summer Time)},
{System Labelled: 0, Discarded: 1, Saved: 0, Reviwed: 0, date: Tue Mar 10 2020 01:00:00 GMT+0100 (Central European Standard Time)},
{System Labelled: 0, Discarded: 0, Saved: 1, Reviwed: 0, date: Sat Jan 11 2020 01:00:00 GMT+0100 (Central European Standard Time)},
Here is the code i have so far:
const objects= [{status: "System Labelled", date: new Date("19-03-2020")},
{status: "System Labelled", date: new Date("19-03-2020")},
{status: "Discarded", date: new Date("19-03-2020")},
{status: "Saved", date: new Date("19-03-2020")}]
objects.reduce((acc, curr) =>{
console.log(acc.includes(curr.status))
if(acc.includes(curr.status)){
curr[acc.status]++
}
},[])
You can take an object for grouping and get the values as result array.
You need valid dates for it.
const
statuses = ["System Labelled", "Discarded", "Saved", "Reviewed"],
objects = [{ status: "System Labelled", date: "2020-03-19" }, { status: "System Labelled", date: "2020-03-19" }, { status: "Discarded", date: "2020-03-19" }, { status: "Saved", date: "2020-03-19" }],
result = Object.values(objects.reduce((acc, { status, date }) => {
acc[date] = acc[date] || { date, ...Object.fromEntries(statuses.map(k => [k, 0])) };
acc[date][status]++;
return acc;
}, {}));
console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }
what if you get the timestamp of each date and then add it as a string after the status it has to create one single string.
Example Object
[{status: "System Labelled", date: Thu Mar 05 2020 01:00:00 GMT+0100 (Central European Standard Time)}
Would Be
"System Labelled 1583366400"
And then you could just substring the timestamp to convert it to a date again
I have the following structure on my firebase database:
I need to get an array of all the data with a special structure. This is how I do it:
const isObject = obj => {
return Object.prototype.toString.call(obj) === '[object Object]' ? true : false;
};
function snapshotToArray(snapshot) {
var returnArr = [];
snapshot.forEach(function(childSnapshot) {
var item = childSnapshot.val();
item.key = childSnapshot.key;
returnArr.push(item);
if (isObject(item)){
returnArr = returnArr.concat(snapshotToArray(childSnapshot));
}
});
return returnArr;
};
And call it:
snapshotToArray(snapshot); // 'snapshot' is the data from database in a snapshot format
Getting:
[ { 'Diciembre-2018': { '-LJV5UxepDNSR5yUCDbf': [Object] },
'Julio-2018': { '-LJUt8yTjpK3oq2wRd_g': [Object] },
key: '2018' },
{ '-LJV5UxepDNSR5yUCDbf':
{ pin: 'mi-pin-dic',
timestamp: 'Thu Aug 09 2018 13:11:39 GMT-0600 (GMT-06:00)' },
key: 'Diciembre-2018' },
{ pin: 'mi-pin-dic',
timestamp: 'Thu Aug 09 2018 13:11:39 GMT-0600 (GMT-06:00)',
key: '-LJV5UxepDNSR5yUCDbf' },
'mi-pin-dic',
'Thu Aug 09 2018 13:11:39 GMT-0600 (GMT-06:00)',
{ '-LJUt8yTjpK3oq2wRd_g':
{ pin: 'mi-pin-julio',
timestamp: 'Thu Aug 09 2018 12:13:21 GMT-0600 (GMT-06:00)' },
key: 'Julio-2018' },
{ pin: 'mi-pin-julio',
timestamp: 'Thu Aug 09 2018 12:13:21 GMT-0600 (GMT-06:00)',
key: '-LJUt8yTjpK3oq2wRd_g' },
'mi-pin-julio',
'Thu Aug 09 2018 12:13:21 GMT-0600 (GMT-06:00)' ]
But as you can see, in the 3rd and 5th iteration it gets an extra data:
'mi-pin-dic',
'Thu Aug 09 2018 13:11:39 GMT-0600 (GMT-06:00)',
'mi-pin-julio',
'Thu Aug 09 2018 12:13:21 GMT-0600 (GMT-06:00)'
My question:
How can I avoid this issue? Any ideas?
My goal:
Call an API and inside this API I would like to:
Find Bills
Find all transactions under each bill (by billId)
Return the values in a JSON ARRAY
The bill array look like this:
{ _id: 549bf0597886c3763e000001,
billName: 'Leasing',
startDate: Thu Dec 25 2014 01:00:00 GMT+0100 (CET),
endDate: Sun Oct 15 2017 00:00:00 GMT+0200 (CEST),
amount: 16500,
type: 4,
timestamp: Thu Dec 25 2014 12:09:13 GMT+0100 (CET),
__v: 0 },
{ _id: 54a014bfac01ca3526000001,
billName: 'Test',
startDate: Tue Oct 28 2014 01:00:00 GMT+0100 (CET),
endDate: Wed Dec 20 2017 00:00:00 GMT+0100 (CET),
amount: 1000,
type: 4,
timestamp: Sun Dec 28 2014 15:33:35 GMT+0100 (CET),
__v: 0 }
From this array, which I get in the step 1, I would like to query the transactions collections and get each transaction for each bill.
The array would have the following transformation:
From:
{ _id: 549bf0597886c3763e000001,
billName: 'Leasing',
startDate: Thu Dec 25 2014 01:00:00 GMT+0100 (CET),
endDate: Sun Oct 15 2017 00:00:00 GMT+0200 (CEST),
amount: 16500,
type: 4,
timestamp: Thu Dec 25 2014 12:09:13 GMT+0100 (CET),
__v: 0 },
{ _id: 54a014bfac01ca3526000001,
billName: 'Test',
startDate: Tue Oct 28 2014 01:00:00 GMT+0100 (CET),
endDate: Wed Dec 20 2017 00:00:00 GMT+0100 (CET),
amount: 1000,
type: 4,
timestamp: Sun Dec 28 2014 15:33:35 GMT+0100 (CET),
__v: 0 }
To:
{ _id: 549bf0597886c3763e000001,
billName: 'Leasing',
startDate: Thu Dec 25 2014 01:00:00 GMT+0100 (CET),
endDate: Sun Oct 15 2017 00:00:00 GMT+0200 (CEST),
amount: 16500,
type: 4,
timestamp: Thu Dec 25 2014 12:09:13 GMT+0100 (CET),
__v: 0 ,
transactions: {
{
"_id" : ObjectId("549ea8c957b654ef64000003"),
"billId" : "5499aece1d7be6c6a3000001",
"paymentDate" : ISODate("2014-12-27T12:40:41.311+0000"),
"amount" : NumberInt(2400),
"timestamp" : ISODate("2014-12-27T12:40:41.311+0000"),
"__v" : NumberInt(0)
}
{
"_id" : ObjectId("549ea9446163b3c666000001"),
"billId" : "5499aece1d7be6c6a3000001",
"paymentDate" : ISODate("2014-12-27T12:42:44.975+0000"),
"amount" : NumberInt(2400),
"timestamp" : ISODate("2014-12-27T12:42:44.975+0000"),
"__v" : NumberInt(0)
}
}
},
{ _id: 54a014bfac01ca3526000001,
billName: 'Test',
startDate: Tue Oct 28 2014 01:00:00 GMT+0100 (CET),
endDate: Wed Dec 20 2017 00:00:00 GMT+0100 (CET),
amount: 1000,
type: 4,
timestamp: Sun Dec 28 2014 15:33:35 GMT+0100 (CET),
__v: 0 }
In my attempt, Im succeding until I get the bills ID from the bill collection but I cannot succeed to get the transaction IDs into an array.
My attempt looks like this:
app.get('/getbills', function(req,res) {
function getTransactions(item, key){
var billId = item._id;
Transactions.find({billId : billId}, function(err, transactions){ // TODO: Needs to look for transactions inside the date.
if (err)
console.log('error: '+ err)
else if (transactions.length !== 0){
return transactions;
}
});
};
Bills.find({type: bill_type}).find(function(err, bills){
if(err)
res.send(err);
details.bills = bills;
details.bills.transations = _.each(bills, getTransactions);
res.send(details);
});
});
I'm using _.each to hold the billId and query the transactions table but there are not enough examples explaining how to use this function in the way I'm trying. Or maybe my attempt is wrong.
Any help is welcome.
Thanks in advance.
You are not waiting for you second call to finish, so you don't have all data at hand. Your return statement does not work as you think it will.
You should read a bit about asynchronicity in JavaScript :)
This code should work. Please take some time to study it and understand why. The trySend function acts as a simple synchronizer and only responds when all data is available. This is not the best way to do it - only the simplest.
app.get('/bills', function( req, res ) {
Bills.find({type: bill_type}, function( err, bills ) {
if( err ) return res.send(err);
var tries = 0;
var details = { bills: bills };
var trySend = function (){
tries++;
if (tries === bills.length) {
res.send(details);
}
};
bills.forEach( function ( bill ) {
Transactions.find({billId : bill._id}, function ( err, transactions ) {
if ( err ) return res.send( err );
bill.transations = transactions;
trySend();
});
});
});
});