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Mongodb count based on array of ids
By 
Witty Wildebeest
on Apr 19, 2021
Witty Wildebeest
on Apr 19, 2021
db.collection.aggregate([
{ $unwind: "$connects" },
// count all occurrences
{ "$group": { "_id": {skill: "$skill", parser_id: "$connects.parser_id"}, "count": { "$sum": 1 } }},
// sum all occurrences and count distinct
{ "$group": { "_id": "$_id.skill", "quantity": { "$sum": 1 } }},
// (optional) rename the '_id' attribute to 'skill'
{ $project: { 'skill': '$_id', 'quantity': 1, _id: 0 } }
])
Source: stackoverflow.com
0
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