Mongoose - this.find() does not exist

Question

within my model, I am trying to do a static getUserByToken method. However, if I do it like in the documentation, I am getting

this.find is not a function

My code looks like this:

'use strict';

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const schema = new Schema({
    mail: {
        type: String,
        required: true,
        validate: {
            validator: (mail) => {
                return /^[-a-z0-9~!$%^&*_=+}{\'?]+(\.[-a-z0-9~!$%^&*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$/i.test(mail);
            }
        }
    },
    birthDate: {
        type: Date,
        required: true,
        max: Date.now,
        min: new Date('1896-06-30')
    },
    password: {
        type: String,
        required: true
    },
    ...
});


schema.statics.getUserByToken = (token, cb) => {
    return this.find({ examplefield: token }, cb);
};

module.exports.Schema = schema;

I am guessing it is just a simple mistake, however, I can not compile the model and than add the static function to the schema/model as this is done through an init function at startup, that compiles all the models.

Anybody can help me with that?

Answer 1

You need to use a normal function declaration for your static function instead of using the fat-arrow syntax so that you preserve Mongoose's meaning of this within the function:

schema.statics.getUserByToken = function(token, cb) {
    return this.find({ examplefield: token }, cb);
};

Reference: https://mongoosejs.com/docs/guide.html#statics