mongoose: various accumulators in group clause

amit.bhagat answered on September 28, 2023 Popularity 1/10 Helpfulness 1/10

answer mongoose: various accumulators in group clause

mongoose: various accumulators in group clause

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{"$group": {
  "_id": "$_id",
  "name": { "$first": "$name" },
  /*
  * first non-null occurence in the group of matching _id
  * Eg; for _id=1, if name=["Rock", "Dwayne"],
  * then $first gives "Rock", whereas $last give "Dwayne"
  */
  "count": { "$sum": 1 },  // for counting matches
  "total": { "$sum": "$value" }  // sums up values
}}

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Source: stackoverflow.com

Tags: clause group whatever

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Contributed on Sep 28 2023

amit.bhagat

0 Answers Avg Quality 2/10

mongoose: various accumulators in group clause

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