TypeError: models.channels.create is not a constructor

user.js //contains user table schema
news.js //contains news table schema

var users = require( './user' );
var news = require( './news' );

module.exports = {
    users:users,
    news:news
};

var config = require('../config');
module.exports = function(schema){
    var users = config.define('channels', {
         user_name: { type: schema.String, limit: 30 },
         ...
         created_at: { type: schema.Date },
         updated_at: { type: schema.Date }
    });

    return users;
};

var caminte = require( 'caminte' ),
    Schema = caminte.Schema,
    config = {
        driver: "mysql",
        host: "localhost",
        port: "3306",
        username: "root",
        password: "",
        database: "test",
        pool: true
    },
    schema = new Schema( config.driver, config );

module.exports = {
    caminte: caminte,
    Schema: Schema,
    config: config,
    schema: schema
}

var socket = require( 'socket.io' ),
    ...
    config = require( './config' ),
    models = require( './models' );

io.on( 'connection', function (socket) {
    socket.on( "new_channel", function (data, device) {
        const channels = new models.channels.create(function(err){
            user_name: 'Peter'
        });

        console.log( channels );
    } );
} );