how to count array in mongoose

Question

How to count and sum the same value of size where stock is equal to 'Available' in one of mongodb collection.

desired result as below:

{_id :'S',count: 5 },
{_id :'M',count: 2 },
{_id :'L',count: 1 }

"price" : 123.8,
"gender" : "women",
"colour" : "blue",
"item" : [ 
    {
        "name" : "ICE DUO ANTHRACITE YELLOW SMALL (S)",
        "size" : "S",
        "stock" : "Available",
        "_id" : ObjectId("59b2829e5acd8e2d14aa84cf")
    }, 
    {
        "name" : "ICE DUO ANTHRACITE YELLOW SMALL (L)",
        "size" : "L",
        "stock" : "Available",
        "_id" : ObjectId("59b2829e5acd8e2d14aa84ce")
    }, 
    {
        "name" : "ICE DUO ANTHRACITE YELLOW SMALL (M)",
        "size" : "M",
        "stock" : "Available",
        "_id" : ObjectId("59b2829e5acd8e2d14aa84cd")
    }
],

Sachin · Accepted Answer · 2017-09-09 16:47:11Z

1

Try below:

db.users.aggregate([
{$match:{stock:'Available'}},
{$unwind: 'item'},
{$group:{_id: '$size', count:{$sum:1}}}
])

edited Sep 9, 2017 at 16:47

answered Sep 9, 2017 at 16:01

Sachin

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7 Comments

William Cheang Chin Heng Over a year ago

I had already tried this code but I didn't get my desired result.

Sachin Over a year ago

So what are you getting after executing it?

William Cheang Chin Heng Over a year ago

Besides that, I still want to match with stock = 'Available'

Sachin Over a year ago

I will edit my answer for available condition. BT Please write ur complete requirement in the question.

William Cheang Chin Heng Over a year ago

After I added some code like { $project: { item: 1 } } I able to get result like [ { _id: 'M', count: 2 }, { _id: 'L', count: 3 }, { _id: 'S', count: 2 } ] But the result is wrong because still doesn't do checking to count out all the size which match with stock='Available'

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