Is there a way to retrieve all values associated with a particular key in mongoose?

Question

Is there a way to retrieve all values associated with a particular key in mongoose?

I have a collection of documents in Mongoose structured as follows:

[
    {
        _id = "...",
        name = "abc123",
        colors = [1, 2, 3]
    },
    {
        _id = "...",
        name = "def431",
        colors = [4, 2, 1]
    },
    {
        _id = "...",
        name = "htl534",
        colors = [3, 5, 7]
    },
    {
        _id = "...",
        name = "lwq154",
        colors = [9, 1, 4]
    }
]

My goal is to extract an array containing all the values associated with the key name, resulting in:

["abc123", "def431", "htl534", "lwq154"]

. How can I achieve this? I've considered using queries or a find function, but haven't been able to work it out yet.

javascript mongodb mongoose

Answer 1

Answer №1

try {
  const information = await Document.search(); // provide the name of your document model, this will gather all documents in an array
  const output = [];
  information.forEach((entry) => output.push(entry.name)); // loop through each document in the information array and save the name to the output array
  return response.status(200).send(output);
} catch (err) {
  return response.status(500).send(err);
}

Answer 2

try {
  const information = await Document.search(); // provide the name of your document model, this will gather all documents in an array
  const output = [];
  information.forEach((entry) => output.push(entry.name)); // loop through each document in the information array and save the name to the output array
  return response.status(200).send(output);
} catch (err) {
  return response.status(500).send(err);
}

Answer 3

Answer №2

In my opinion, utilizing an aggregate query and eliminating the need for a loop can be achieved by incorporating a straightforward $group as shown below:

db.collection.aggregate([
  {
    "$group": {
      "_id": null,
      "result": {
        "$push": "$name"
      }
    }
  }
])

To see an example, click here

This query gathers all values into an array named result. Another option is to utilize $addToSet to prevent duplicates. Example available here

Answer 4

In my opinion, utilizing an aggregate query and eliminating the need for a loop can be achieved by incorporating a straightforward $group as shown below:

db.collection.aggregate([
  {
    "$group": {
      "_id": null,
      "result": {
        "$push": "$name"
      }
    }
  }
])

To see an example, click here

This query gathers all values into an array named result. Another option is to utilize $addToSet to prevent duplicates. Example available here

Is there a way to retrieve all values associated with a particular key in mongoose?

Answer №1

Answer №2

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