mongodb/mongoose findMany - find all documents with IDs listed in array

Question

I have an array of _ids and I want to get all docs accordingly, what's the best way to do it ?

Something like ...

// doesn't work ... of course ...

model.find({
    '_id' : [
        '4ed3ede8844f0f351100000c',
        '4ed3f117a844e0471100000d', 
        '4ed3f18132f50c491100000e'
    ]
}, function(err, docs){
    console.log(docs);
});

The array might contain hundreds of _ids.

Answer 1

The find function in mongoose is a full query to mongoDB. This means you can use the handy mongoDB $in clause, which works just like the SQL version of the same.

model.find({
    '_id': { $in: [
        mongoose.Types.ObjectId('4ed3ede8844f0f351100000c'),
        mongoose.Types.ObjectId('4ed3f117a844e0471100000d'), 
        mongoose.Types.ObjectId('4ed3f18132f50c491100000e')
    ]}
}, function(err, docs){
     console.log(docs);
});

This method will work well even for arrays containing tens of thousands of ids. (See Efficiently determine the owner of a record)

I would recommend that anybody working with mongoDB read through the Advanced Queries section of the excellent Official mongoDB Docs

Answer 2

Ids is the array of object ids:

const ids =  [
    '4ed3ede8844f0f351100000c',
    '4ed3f117a844e0471100000d', 
    '4ed3f18132f50c491100000e',
];

Using Mongoose with callback:

Model.find().where('_id').in(ids).exec((err, records) => {});

Using Mongoose with async function:

const records = await Model.find().where('_id').in(ids).exec();

Or more concise:

const records = await Model.find({ '_id': { $in: ids } });

Don't forget to change Model with your actual model.

Answer 3

Combining Daniel's and snnsnn's answers:

let ids = ['id1', 'id2', 'id3'];
let data = await MyModel.find({
  '_id': { 
    $in: ids
  }
});

Simple and clean code. It works and tested against:

"mongodb": "^3.6.0",
"mongoose": "^5.10.0",

Answer 4

Use this format of querying

let arr = _categories.map(ele => new mongoose.Types.ObjectId(ele.id));

Item.find({ vendorId: mongoose.Types.ObjectId(_vendorId) , status:'Active'})
  .where('category')
  .in(arr)
  .exec();

Answer 5

This code works for me just fine as of mongoDB v4.2 and mongoose 5.9.9:

const Ids = ['id1','id2','id3']
const results = await Model.find({ _id: Ids})

and the Ids can be of type ObjectId or String

Answer 6

Both node.js and MongoChef force me to convert to ObjectId. This is what I use to grab a list of users from the DB and fetch a few properties. Mind the type conversion on line 8.

// this will complement the list with userName and userPhotoUrl 
// based on userId field in each item
augmentUserInfo = function(list, callback) {
    var userIds = [];
    var users = [];         // shortcut to find them faster afterwards

    for (l in list) {       // first build the search array
        var o = list[l];

        if (o.userId) {
            userIds.push(new mongoose.Types.ObjectId(o.userId)); // for Mongo query
            users[o.userId] = o; // to find the user quickly afterwards
        }
    }

    db.collection("users").find({
        _id: {
            $in: userIds
        }
    }).each(function(err, user) {
        if (err) {
            callback(err, list);
        } else {
            if (user && user._id) {
                users[user._id].userName = user.fName;
                users[user._id].userPhotoUrl = user.userPhotoUrl;
            } else { // end of list
                callback(null, list);
            }
        }
    });
}

Answer 7

if you are using the async-await syntax you can use

const allPerformanceIds = ["id1", "id2", "id3"];
const findPerformances = await Performance.find({ 
    _id: { 
        $in: allPerformanceIds 
    } 
});           

Answer 8

I tried like below and it works for me.

var array_ids = [1, 2, 6, 9]; // your array of ids

model.find({ 
    '_id': { 
        $in: array_ids 
    }
}).toArray(function(err, data) {
    if (err) {
        logger.winston.error(err);
    } else {
        console.log("data", data);
    }
});

Answer 9

I am using this query to find the files in mongo GridFs. I wanted to get the by its Ids.

For me this solution is working: Ids type of ObjectId.

gfs.files
.find({ _id: mongoose.Types.ObjectId('618d1c8176b8df2f99f23ccb') })
.toArray((err, files) => {
  if (!files || files.length === 0) {
    return res.json('no file exist');
  }
  return res.json(files);
  next();
});

This is not working: Id type of string

gfs.files
.find({ _id: '618d1c8176b8df2f99f23ccb' })
.toArray((err, files) => {
  if (!files || files.length === 0) {
    return res.json('no file exist');
  }
  return res.json(files);
  next();
});