WhatToWatch/server/db/models/index.js

import fs from 'fs';
import path from 'path';
import Sequelize from 'sequelize';
import configs from '../config/config';

const basename = path.basename(__filename);
// istanbul ignore next
const env = process.env.NODE_ENV || 'development';
const config = configs[env];
const capitalize = string => string[0].toUpperCase() + string.slice(1);

const sequelize = (() => {
  if (process.env.DATABASE_URL) {
    // the application is executed on Heroku ... use the postgres database
    return new Sequelize(process.env.DATABASE_URL, {
      dialect: 'postgres',
      protocol: 'postgres',
    });
  } else {
    return new Sequelize(config.database, config.username, config.password, {
      ...config,
      operatorsAliases: false,
      logging: false,
    });
  }
})();

const db = fs
  .readdirSync(__dirname)
  .filter(
    file =>
      file.indexOf('.') !== 0 && file !== basename && file.slice(-3) === '.js',
  )
  .reduce(
    (acc, file) => {
      const model = sequelize.import(path.join(__dirname, file));
      acc[capitalize(model.name)] = model;
      return acc;
    },
    {sequelize, Sequelize},
  );

Object.keys(db).forEach(modelName => {
  // istanbul ignore next
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});

// Syntax required to destructure models off of exported db
module.exports = db;