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How to use Aggregate in mongoose


How to use Aggregate in mongoose

By : user2954868
Date : November 22 2020, 10:33 AM
around this issue How do I define the following MongoDB aggregate query in mongoose: , Try this
code :
Contacts.aggregate({$group: { "_id": { code: "$Code", name: "$Name" } } }, function(err, contacts) {
   ...
});
Contacts.aggregate([
  { $match : { AgencyTranslation: /^BROADCASTING/ } },
  { $group: { "_id": { code: "$Code", name: "$Name" } } }
], function(err, contacts) {
  // ...
});


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Mongodb/mongoose aggregate

Mongodb/mongoose aggregate


By : Reds Lenz
Date : March 29 2020, 07:55 AM
should help you out I have below data in mongodb: , Here is the aggregate query (tested on MongoDB 3.0):
code :
[  
   {  
      $project:{  
         articleId:"$articleId",
         score:{  
            $add:[  
               "$QualityScore",
               "$RelevanceToTech"
            ]
         }
      }
   },
   {  
      $group:{  
         _id:"$articleId",
         avgScore:{  
            $avg:"$score"
         }
      }
   },
   {  
      $sort:{  
         avgScore:-1
      }
   },
   {  
      $limit:3
   }
]
Mongoose aggregate with $in

Mongoose aggregate with $in


By : N.Snow
Date : March 29 2020, 07:55 AM
it fixes the issue after reading https://stackoverflow.com/a/44688386/2802552 how can I apply it in my case ? , Using async.waterfall :
code :
async.waterfall([
    function (cb) {
        Conversation.aggregate([
            {
                $lookup: {
                    from: Message.collection.name, // collection name in db, mongo uses plural in $lookup (nice trick preventing from "hard-coding" it)
                    localField: '_id',
                    foreignField: 'conversation',
                    as: 'messages'
                }
            },
            {
                $project: {
                    'messages.conversation': 0 // to hide the conversation id in Conversation.messages array
                }
            }
        ], function (err, conversations) {
            cb(null, results);
        });
    },
    function (results, cb) {
        Conversation.populate(conversations, [{
                path: 'participants',
                model: 'User',
                select: 'name'
            }, {
                path: 'messages.sender',
                model: 'User',
                select: 'name'
            }], function (err, results) {
                cb(null, results)
            }
        )
    }], function (err, results) {
    console.log(results); // finally :)  
});
Mongoose return aggregate result like mongoose paginate

Mongoose return aggregate result like mongoose paginate


By : vijay kumar
Date : March 29 2020, 07:55 AM
wish of those help I have the following code in Node.js: , Okay, as it seems I was overcomplicating things and a simple:
code :
var profiles = await Profile.aggregate(clause);
return profiles;
Mongoose aggregate

Mongoose aggregate


By : Eric Shank
Date : March 29 2020, 07:55 AM
should help you out I need some help with Mongo, Mongoose and Nodejs. , The following Query will be help:
code :
 models.Carrinho.aggregate(
    [     
        { "$match": { "_id": mongoose.Types.ObjectId(req.params.id) } },
        {
            "$lookup": {
              "from": "produtos",
              "localField": "produtos._id",
              "foreignField": "_id",
              "as": "produtosnocarrinho"
            }
          },
          {
            "$addFields": {
              "total": {
                "$reduce": {
                  "input": "$produtos",
                  "initialValue": 0,
                  "in": { "$add": ["$$value", "$$this.price"] }
                }
              }
            }
          },
          {$unwind : '$produtos'},
          {$unwind : '$produtosnocarrinho'},
          {$redact: { $cond: [{
                                  $eq: [
                                         "$produtos._id",
                                         "$produtosnocarrinho._id"
                                       ]
                                },
                                "$$KEEP",
                                "$$PRUNE"
                              ]
                      }
            },
            { $project: {
                     _id : 1,
                     title : 1,
                     produtosData : {
                        _id : "$produtos._id",
                        price : "$produtos.price",
                        description : "$produtosnocarrinho.description"
                     },
                     total : 1,
                     createdAt:  1,
                     updatedAt : 1
                }
           },
           {
              $group : {
                    _id : {
                        _id : '$_id',
                        title : '$title',
                        total : '$total',
                        createdAt  : '$createdAt',
                        updatedAt : '$updatedAt'
                    },
                    produtosData: {$push: "$produtosData" }
              }
           },
           { $project: {
                    _id  : '$_id._id',
                    title : '$_id.title',
                    total : '$_id.total',
                    createdAt  : '$_id.createdAt',
                    updatedAt : '$_id.updatedAt',
                    produtosData:  '$produtosData'
                }
           }
    ]).exec((err, data) => {
        if (err) res.json(err)

        res.json(data)
      });


Output : 
[{
    "_id": "5cbc42c24502a7318952d7b2",
    "title": "Carrinho do Lucas",
    "total": 60.300000000000004,
    "createdAt": "2019-04-21T10:15:30.629Z",
    "updatedAt": "2019-04-21T10:15:30.629Z",
    "produtosData": [{
        "_id": "5cafead2bc648978100d7698",
        "price": 20.1,
        "description": "HASBRO MR. POTATO HEAD MALETA DE PEÇAS"
    }, {
        "_id": "5cae911adf75ac4d3ca4bcb6",
        "price": 20.1,
        "description": "AÇÚCAR REFINADO UNIÃO 1KGS"
    }, {
        "_id": "5cb0f0adc5fb29105d271499",
        "price": 20.1,
        "description": "REPELENTE EXPOSIS INFANTIL SPRAY"
    }]
}]
How to use mongoose aggregate well

How to use mongoose aggregate well


By : pwhilgert
Date : March 29 2020, 07:55 AM
may help you . I am using this query search with Mongodb to get only '_id' value matched from 'clientID'. , if you want to use Async Await,
code :
try {    
    let order =  await Order.find({"clientID":"1234"}, "_id"); 
    return res.send({order});
} catch(error) {
    return next(error);
}
 return Order.find({clientID:"1234" },{ '_id': 1 },(error,order) => {
     if (error) return next(error);
     return res.send({order});
 });
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