join values from an array of objects in mongo

Clear Cow answered on August 13, 2024 Popularity 1/10 Helpfulness 1/10

answer join values from an array of objects in mongo

join values from an array of objects in mongo

Comment

{
  "_id": 1,
  "name": "John Doe",
  "hobbies": [
    { "id": 1, "name": "reading" },
    { "id": 2, "name": "swimming" },
    { "id": 3, "name": "coding" }
  ]
}


db.users.aggregate([
  {
    $project: {
      name: 1,
      hobbiesString: {
        $reduce: {
          input: "$hobbies",
          initialValue: "",
          in: {
            $concat: [
              "$$value",
              { $cond: { if: { $eq: ["$$value", ""] }, then: "", else: ", " } },
              "$$this.name"
            ]
          }
        }
      }
    }
  }
])

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript join

Link to this answer
Share Copy Link

Contributed on Aug 13 2024

Clear Cow

0 Answers Avg Quality 2/10

join values from an array of objects in mongo

Contents

More Related Answers

join values from an array of objects in mongo

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.