Retrieve a specific set of objects with Mongoose, extracting only the objects contained within it

Picture this scenario:

{
  "_id": "2020 Standings",
  "DriversChampionship": [
    {
      "_id": "5fd3966d2769dc12dc010475",
      "driverName": "Lewis Hamilton",
      "driverTeam": "Mercedes AMG",
      "driverPts": "230"
    },
    {
      "_id": "5fd3966d2769dc12dc010476",
      "driverName": "Sebastian Vettel",
      "driverTeam": "Ferrari",
      "driverPts": "161"
    }
  ],
  "ConstructorsChampionship": [
    {
      "_id": "5fd3966d2769dc12dc010489",
      "teamName": "Mercedes AMG",
      "teamPts": "230"
    },
    {
      "_id": "5fd3966d2769dc12dc01048a",
      "teamName": "Ferrari",
      "teamPts": "161"
    }
  ]
}

In the Routes folder, I have created a GET request as follows:

router.route("api/standings/:arrayName")
    .get(getStandingsArray);

How can Mongoose find and send a res.json response with only the array that matches the :arrayName?

Let me illustrate with an example:

If I access the route 

http://localhost:4000/api/standings/DriversChampionship

The controller extracts the :arrayName using...

const arrayName = req.params.arrayName

// arrayName = DriversChampionship

and then retrieves and displays this particular array of objects using modelName.find()...

"DriversChampionship": [
    {
      "_id": "5fd3966d2769dc12dc010475",
      "driverName": "Lewis Hamilton",
      "driverTeam": "Mercedes AMG",
      "driverPts": "230"
    },
    {
      "_id": "5fd3966d2769dc12dc010476",
      "driverName": "Sebastian Vettel",
      "driverTeam": "Ferrari",
      "driverPts": "161"
    }
  ]

I'm still trying to figure out how to accomplish this with Mongoose.

Any suggestions or ideas?

Feel free to ask if any part of my explanation is unclear

Thank you!

javascriptmongodbmongoose

Answer №1

To obtain the desired field (such as 'DriversChampionship' in this case), you can utilize the select method. Here's how:

var result = modelName.find({}).select('DriversChampionship -_id');

If you want to make it more dynamic, you can do the following:

const fieldName = req.params.fieldName
var result = modelName.find({}).select(`${fieldName} -_id`);

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