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https://www.mongodb.com/community/forums/t/count-values-in-array-of-objects/13035/5

Better Butterfly answered on April 7, 2022 Popularity 1/10 Helpfulness 1/10

answer https://www.mongodb.com/community/forums/t/count-values-in-array-of-objects/13035/5

https://www.mongodb.com/community/forums/t/count-values-in-array-of-objects/13035/5

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db.collection.aggregate([
  {
    "$project": {
      "_id": 0,
      "up": {
        "$size": {
          "$filter": {
            "input": "$votes",
            "as": "vote",
            "cond": {
              "$eq": [
                "$$vote.action",
                "up"
              ]
            }
          }
        }
      },
      "down": {
        "$size": {
          "$filter": {
            "input": "$votes",
            "as": "vote",
            "cond": {
              "$eq": [
                "$$vote.action",
                "down"
              ]
            }
          }
        }
      }
    }
  }
])

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Source: www.mongodb.com

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Contributed on Apr 07 2022

Better Butterfly

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