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Mongo and Node.js find and aggregate


Mongo and Node.js find and aggregate

By : Anitha
Date : November 21 2020, 07:01 PM
will be helpful for those in need Use $match in aggregate instead of using find as explained here: https://docs.mongodb.com/manual/reference/operator/aggregation/match/
For example:
code :
db.articles.aggregate(
    [ { $match : { author : "dave" } } ]
);


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Mongo aggregate query pulling out last 7 days worth of data (node.js)

Mongo aggregate query pulling out last 7 days worth of data (node.js)


By : Stephanie Garcia
Date : March 29 2020, 07:55 AM
like below fixes the issue I have a large collection of data which I'm trying to pull out of Mongo (node js) in order to render some graphs. , The general pattern for this type of query is:
code :
// Compute the time 7 days ago to use in filtering the data
var d = new Date();
d.setDate(d.getDate()-7);

db.users.aggregate([
    // Only include the docs that have at least one passedModules element
    // that passes the filter.
    {$match: {'passedModules.date': {$gt: d}}},
    // Duplicate the docs, one per passedModules element
    {$unwind: '$passedModules'},
    // Filter again to remove the non-matching elements
    {$match: {'passedModules.date': {$gt: d}}}
])
conflict between mongo find and aggregate results

conflict between mongo find and aggregate results


By : Josh Boerger
Date : March 29 2020, 07:55 AM
this will help The query you have currently is comparing the stored dates with strings, you need to create date object representations from the strings in order for the query to work. Use the native JS Date() constructor to create a date instance:
code :
var end = new Date("2016-08-27 23:59:59"),
    start = new Date("2016-08-19");

var pipeline = [
    {
        "$match": {
            "restaurantId": 138,
            "createdAt": { "$lte": end, "$gte": start }
        }
    },
    {
        "$group": {
            "_id": null,
            "count": { "$sum": 1 }
        }
    }
]
var end = moment(Number(data.createdAt.to)).toDate(),
    start =  moment(Number(data.createdAt.from)).toDate();
var start = moment(Number(data.createdAt.from)).startOf('day').toDate(); // set to 12:00 am for that date
var end = moment(Number(data.createdAt.to)).endOf('day').toDate(); // set to 23:59 pm for that date
Mongo Node driver how to get all fields of $max aggregate from an array of objects

Mongo Node driver how to get all fields of $max aggregate from an array of objects


By : Renee Padgham
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have a collection called "products" which has an array of "bids" objects.
code :
db.products.aggregate([{$unwind:"$bids"},{$group:{_id:"$_id", sum:{$sum:"$bids.bid_amount"}}},{$project:{doc:"$$ROOT", _id:1, sum:1}, {$sort:{"sum":-1}},{$limit:1}]),
node js mongo aggregate does not work

node js mongo aggregate does not work


By : wayne walsh
Date : March 29 2020, 07:55 AM
Hope this helps Your query is not valid. It seems to me that you are basically missing a comma.
SyntaxError: Unexpected identifier usually means that you have a token at an unsuitable place which is not understood by javascript. The best(or rather the easiest) way to tackle these errors is by using a static code analyzer like eslint, flow or sonar qube.
Nested find or aggregate in mongo

Nested find or aggregate in mongo


By : user1645631
Date : March 29 2020, 07:55 AM
To fix the issue you can do Below is structure of the documents in my json file. I want to display the first name and surname of each winner grouped by the year they won. , Something like this should do it:
code :
db.winners.aggregate([{
    $unwind: "$prizes"
  },
  {
    $group: {
      _id: {
        name: {
          $concat: [
            "$firstname",
            " ",
            "$surname"
          ]
        }
      },
      years: {
        $push: "$prizes.year"
      }
    }
  },
  {
    $addFields: {
      name: "$_id.name"
    }
  },
  {
    $project: {
      _id: 0
    }
  }
])
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