A Meteor client Template returns mongodb cursor. The collection has 3 documents which contain date field. I expected the find to return 3 documents, but it only gave one the date of which is Mon Aug 08 2016 00:00:00 GMT+1000 (AEST).
Why is that and how can I get the 3 documents? Thanks
"date" : ISODate("2016-08-08T14:00:00Z"),
"date" : ISODate("2016-08-08T14:00:00Z"),
"date" : ISODate("2016-08-07T14:00:00Z"),
console.log(start); //=> Sun Aug 07 2016 00:00:00 GMT+1000 (AEST)
console.log(end); //=> Mon Aug 08 2016 00:00:00 GMT+1000 (AEST)
console.log(myCol.find({date: {$gte: start, $lte: end}}).fetch()); // expected 3 not just 1
the code below shows how the date was before inserting in the collection.
const date = cheerioObj(this).next().html().trim();
const dArr = date.split('/');
const dObj = new Date(parseInt(dArr[2]), parseInt(dArr[1]) - 1, parseInt(dArr[0]));
EDIT: Sorry, it's late.
It may be to do with your .fetch() method. Try iterating the cursor instead:
var myArray = db.users.find({...}).toArray();
Then access each in a for loop.
I am able to get data by using below query for integer from my table of mongoDb by using umongo UI Interface.
{ sequence: { $gt: 4035 } }
{sequence:{$gte:4035,$lte:4035}}
Both above queries are working fine
but in the same table or collection I have one column schedules inside the schedules I have startDate endDate column
by using this column I want to execute "between clause" on the basis of start date and end date like below but no records are showing .
{'schedules.start': {'$gte': "1-1-2014",'$lt': "14-1-2016"}}
or
{'schedules.start': {$gte: '1-1-2014',$lt: '14-1-2016'}}
or
{'schedules.start': {$gte: 1-1-2014,$lt: 14-1-2016}}
or
{ 'schedules': {'$gt': 'date':'Wed Jan 01 05:30:00 IST 2014', '$lt': 'date' :'Wed Dec 31 05:30:00 IST 2014'}}
so I need between query on the basis of starDate and endDate.
My table structure:
site--> schedules-->star(date):Wed Jan 01 05:30:00 IST 2014
end(date) :Wed Dec 31 05:30:00 IST 2014
Here I am attaching screen shot of my table.
Thank you in advance
Can you wrap it with an $and clause?
{
$and: [
{'schedules.startDate': {$gte: 1-1-2014}},
{'schedules.endDate': {$lt: 14-1-2016}}
]
}
Obviously you'll need to adjust naming conventions to your model.
I've two collections one is random and other one is 'msg'
In message I've a document like
{ "message": "sssss", postedAt: Fri Jul 17 2015 09:03:43 GMT+0530 (IST) }
For random collection, there is a script which generates random number every minute
like
{ "randomStr": "sss", postedAt: Fri Jul 17 2015 09:03:43 GMT+0530 (IST) }
{ "randomStr": "xxx", postedAt: Fri Jul 17 2015 09:04:43 GMT+0530 (IST) }
{ "randomStr": "yyy", postedAt: Fri Jul 17 2015 09:05:43 GMT+0530 (IST) }
Notice the change in timings, for every mintute there is a new record.
Now, my issue is
when I query for message collection, I'll get one record.
Lets's say this
{ "message": "sssss", postedAt: Fri Jul 17 2015 09:03:13 GMT+0530 (IST) }
now I want to get the record from random collection which posts at exact minute
this message is posted at 09:03, I want to get the record from random collection which postedat exactly same time 09:03.
How to do that? Any help appreciated. Thx.
Note: I'm doing this in meteor
Edit
Added image for first comment
So the point here is 'actually use a range' and also be aware of the Date value you get in return. So as a basic example in principle.
The time right now as I execute this is:
var date = new Date()
ISODate("2015-07-17T04:02:04.471Z")
So if you presume then that your actual timestamp in the document is "not exactly to the minute" (like above) nor is it likely the "random record" is so then the first thing to do is "round" it to the minute:
date = new Date(date.valueOf() - date.valueOf() % ( 1000 * 60 ))
ISODate("2015-07-17T04:02:00Z")
And of course the "end date" is just one minute after that:
var endDate = new Date(date.valueOf() + ( 1000 * 60 ))
ISODate("2015-07-17T04:03:00Z")
Then when you query "rqndom" you just get the "range", with $gte and $lt operators:
db.random.find({ "postedAt": { "$gte": date, "$lt": endDate } })
Which just retrieves your single "write once a minute" item from "random" at any possible value within that minute.
So basically:
Round your input retrieved date to the minute
Search on the "range" betweeen that value and the next minute
I would like to retrieve a list that contains an specified record under some conditions and only retrieve a number of records before and a number of records after that record. Are there any solutions?
For example, I have a MongoDB schema { id, date, section }
Data set:
100, 26 Aug 2014 11:00, A
110, 26 Aug 2014 11:01, A
140, 26 Aug 2014 12:00, A
141, 27 Aug 2014 12:00, B
200, 30 Aug 2014 11:00, A
210, 01 Sep 2014 11:01, B
290, 02 Sep 2014 12:00, A
300, 26 Sep 2014 12:00, A
301, 27 Oct 2014 12:00, B
302, 30 Oct 2014 11:23, A
410, 01 Oct 2014 15:01, B
590, 02 Oct 2014 12:00, A
600, 26 Nov 2014 00:00, A
I would like to get a list, which contains an unique id = 300 and 3 records before and 3 records after that record with id = 300, sorted by date under section A.
The output:
140, 26 Aug 2014 12:00, A
200, 30 Aug 2014 11:00, A
290, 02 Sep 2014 12:00, A
300, 26 Sep 2014 12:00, A <-- middle
302, 30 Oct 2014 11:23, A
590, 02 Oct 2014 12:00, A
600, 26 Nov 2014 00:00, A
I have a stupid approach:
get the date (let say it's 26 Sept 2014 12:00) of the specified id = 300 with section A
set a query to find records that the date is greater than and equal to 26 Sept 2014 12:00 ordered by date, limited by 3 records.
set a query to find records that the date is less than 26 Sept 2014 12:00 ordered by date, limited by 3 records.
combine two lists.
Is there any better approaches to just retrieve this kind of list in a query or in better performance? Thank you.
Let's your schema name be USER. You could use below mongo db query to fetch the result
$sort function :
1 represents ascending
-1 represents descending
Refer documentation : $Sort Documentation
Query will be :
db.user.aggregate({$match : { "id" : 300}},{$sort : {"date": 1 }},{$skip : 0},{$limit : 10});
$skip value will be your limit value after first query
db.user.aggregate({$match : { "id" : 300}},{$sort : {"date": 1 }},{$skip : 10},{$limit : 10});
Refer Documentation : Aggregation Documentation
$skip and $limit in aggregation framework
Here is a good example of using skip and limit which should help you achieve the SELECT TOP X or LIMIT X
Note: I'm assuming you want to use the aggregate framework based on the tagging of this question.
I believe this should do it
x = 300;
db.user.aggregate({$match : { "id" : {$lte: x+10,$gte: x-10 }},{$sort : {"date": 1 }}});
If I have two ISODates such as:
Tue Sep 18 1984 00:00:00 GMT+0100 (CET)
and
Sat Jun 21 2014 10:00:00 GMT+0100 (CET)
how do I get a difference between them using the mongo console? Specifically the difference in years?
they are from different collections so I can't use an aggregation for this.. :(
ISODate() is just a convenient wrapper around a standard JavaScript Date object so you can use the standard Date methods or calculate the difference yourself (date values are stored in milliseconds):
> var date1 = ISODate("1984-09-18");
> var date2 = ISODate("2014-06-21");
> date2.getFullYear() - date1.getFullYear()
30
> var yearMS = 365 * 24 * 60 * 60 * 1000; // a year in milliseconds
> parseFloat((date2-date1)/yearMS).toFixed(2)
29.78