Check if ID exists in a collection with mongoose

Question

For instance, I have a collection User:

var mongoose = require(\'mongoose\');

var UserSchema = new mongoose.Schema({
    email: String,
    googleI         


        

Answer 1

The accepted answer is fine for small collections.

A faster way on larger collections is to simply use this:

const result = await User.findOne({ _id: userID }).select("_id").lean();
if (result) {
    // user exists...
}

// or without "async/await":

User.findOne({ _id: userID }).select("_id").lean().then(result => {
    if (result) {
        // user exists...
    }
});

It won't return all fields. I believe they are currently working on a new feature to support what you (and I) want.

---

In the meantime you could create a plugin, very simple and reusable.

Create an any.js file with this code:

module.exports = function any(schema, options) {
    schema.statics.any = async function (query) {
        const result = await this.findOne(query).select("_id").lean();
        return result ? true : false;
      };
  }

Then in your model you do this:

var mongoose = require('mongoose');
const any = require('./plugins/any'); // I'm assuming you created a "plugins" folder for it

var UserSchema = new mongoose.Schema({
    email: String,
    googleId: String,
    facebookId: String,
    displayName: String,
    active: Boolean
});

UserSchema.plugin(any);
module.exports = mongoose.model('User', UserSchema);

...and use it like this:

const result = await User.any({ _id: userID });
if (result) {
    // user exists...
}

// or without using "async/await":

User.any({ _id: userID }).then(result => {
    if (result) {
        // user exists...
    }
});