I've got a little problem, which I'm unable to find a solution to. Let's say I want to query a collection for a field value within a range. However, the field value should have a computation done on it before being search for in a range.
For e.g.
itemCollection.find({interval: {
$gte: ISODate("2010-04-29T00:00:00.000Z"),
$lt: ISODate("2010-05-01T00:00:00.000Z")
}}).find(function(err, items){
if (!err){
res.send(items);
} else {
console.log(err);
}
});
Here, interval value is 2. I need to get the current date, add two days to it and get the date it will be in two days (interval value) and then check if the resulting date is in the range.
Is there any way to do this?
Yes, that is quite possible and easy to do (if I didn't fail to understand your question).
var startDate = new Date();
var endDate = new Date(startDate);
endDate.setDate(endDate.getDate()+2);
itemCollection.find({interval: {
$gte: startDate,
$lt: endDate
}}).find(function(err, items){
if (!err){
res.send(items);
} else {
console.log(err);
}
});
Related
I'm new to Javascript. The code below compare both date and time. I wanted to make a function where user can only claim the coins once for each day. However, when user claims the coins on the next day, the button is still disabled because the code below follow the time that user last claimed their coins. I've tried so many ways but it still comparing both date and time. Anyone knows on how to compare the date without time?
$(document).ready(function () {
if (new Date(model[0].lastClaimedDate) < new Date()) {
document.getElementById('btnAddCoins').disabled = false;
}
else {
document.getElementById('btnAddCoins').disabled = true;
}
})
new Date(model[0].lastClaimedDate).setHours(0,0,0,0) < new Date()
This will set the time values to 0 in the datetime object being saved for the user
Did you try this:
new Date(model[0].lastClaimedDate).getDate() < new Date().getDate()
Currently I have a timestamp field with value format like 1479664146607.
What I wanted to do is to get all data with timestamp that has a year of let's say 2017.
My current code is non-performant. It gets all the data, and then uses a filter method.
Let's say I got 2000+ records.
const records = []; // all records
const data = records.filter(r => new Date(r).getYear == '2017');
While this code works, it kills the server.
My database is nedb and using feathersjs, I can actually get equality items by
app.service('messages').find({
query: {
timestamp: '2017'
}
});
This code will not work because it will search for the exact year. I am looking for a way to convert the timestamp field to a year before searching it in the database.
Okay, so what I did is to use the $gt and $lt operators.
Let's say we want to get all data in year 2018.
Using momentjs, I did something like this:
const year = '2018';
// Get previous year based on given year
const previousYear = moment(year, 'YYYY').subtract(1, 'year').format('YYYY');
// Get next year based on given year
const nextYear = moment(year, 'YYYY').add(1, 'year').format('YYYY');
// get full ending date of previous year
const endOfPreviousYear = moment(previousYear, 'YYYY').endOf('year').format('x');
// get full starting date of next year
const startOfNextYear = moment(nextYear, 'YYYY').startOf('year').format('x');
// get data where year is greater than `endOfPreviousYear` and less than `startOfNextYear`
const yearQuery = {
$gt: +endOfPreviousYear,
$lt: +startOfNextYear
}
app.service('messages').find({
query: {
timestamp: yearQuery
}
});
I'm trying to work out how I can paginate my data efficiently. If I have a url such as: example.com/items?page=5, how can I retrieve the correct records every single time (so that the same record doesn't show up on another page)? I thought to I'd have to first sort the DB records first, then use mongoose to do a range query such as the one below.
How does this fare when the amount of records scales rapidly? I'm worried that the sorting process will take far too long and bottleneck the process. Any advice?
Submission.find({
/* First Case: Hour */
created: { $lt: new Date(), $gt: new Date(year+','+month+','+day+','+hour+','+min+','+sec) } // Get results from start of current hour to current time.
/* Second Case: Day */
created: { $lt: new Date(), $gt: new Date(year+','+month+','+day) } // Get results from start of current day to current time.
/* Third Case: Month */
created: { $lt: new Date(), $gt: new Date(year+','+month) } // Get results from start of current month to current time.
/* Fourth Case: Year */
created: { $lt: new Date(), $gt: new Date(year) } // Get results from start of current year to current time.
})
You can work on following query:
var query = Model.find(conditions).sort(sort).skip(skip).limit(limit);
where
condition will be say { age: { $gt: 20 } }
sort will be say { name: 1}
skip will be say 20
limit will be say 10
then execute the following query to get the records
return query
.exec()
.then(function (cursor) { ...... });
I am using node.js and monodb database where I want to query records based on date and I want to ignore time and date only month and year will be matched here is my code:-
collection.find({ date: { "$gte": sDate, "$lt": eDate) } }).count(function (e, c) {
});
this is working but matching date and time as well how I can match only month and year? Please help me to solve this problem.
Edit:- some data from collection:-
{
"_id" : ObjectId("5535e76f82a964d011e34fcf"),
"VisitorId" : "5535e72a82a964d011e34fcb",
"date" : ISODate("2015-01-21T06:00:15.761Z"),
}
{
"_id" : ObjectId("5535e75f82a964d011e34fcf"),
"VisitorId" : "5535e72a82a964d011e34fcb",
"date" : ISODate("2015-04-21T06:00:15.761Z"),
}
I will pass two params i.e {month:"1",year:"2015"};
and in output first docs should be display.
Thanks
You could use the $where operator in your query:
collection.find({
"$where": function() {
return this.date.getMonth() == 0 && this.date.getFullYear() == 2015
}
}).count(function (err, data) {
// Handle err
});
However, query performance is rather compromised because using $where alone requires a table scan, it takes a global lock. You should use $where only when you can't express your query using another operator. If you must use $where , try to include at least one other standard query operator to filter the result set.
Other options are to modify your schema and store the month in its own property (if it's a common field in your queries). You are guaranteed better query performance since the field can be indexed.
The other option will be when query a specific month and year, create a query object that only looks for the start and the end of that specific month.
var sDate = new Date(2015, 0, 1);
var eDate = new Date(2015, 1, 1);
collection.find({ date: { "$gte": sDate, "$lt": eDate) } }).count(function (e, c) {
});
I want to find a specific document via a date range (beginDate should be greater or equals - and closeDate should be lesser or equals the current date).
The document looks like this:
{ "beginDate" : ISODate("2014-11-03T23:00:00Z"),
"closeDate" : ISODate("2014-11-10T23:00:00Z"),
"desc" : "Test",
"status" : "ok",
"playerId" : "ZLkQzaY7DDvwL8sRj",
"_id" : "kozi9eHcLYa2LbWDG" }
My query looks like this:
var doc = TestData.findOne({
playerId: player._id,
beginDate: { $gte: new Date(new Date().toISOString()) },
closeDate: { $lte: new Date(new Date().toISOString()) }
});
Unfortunately, this does not work. How can I solve it?
Any help would be greatly appreciated.
You've got the logic backwards on the comparisons so you need to swap the $lte and $gte usage. You want to find the docs where beginDate has a value less than or equal to the current time, and a closeDate has a value greater than or equal to the current time. You can also just use new Date() to get the current time.
var doc = TestData.findOne({
playerId: player._id,
beginDate: { $lte: new Date() },
closeDate: { $gte: new Date() }
});