text: const fs = require('fs');
  const path = require('path');
  const Sequelize = require('sequelize');
  const basename = path.basename(module.filename);
  const env = process.env.NODE_ENV || 'development';
  const config = require(`${__dirname}/../config/config.json`)[env];
  const db = {};
  
  let sequelize;
  if (config.use_env_variable) {
    sequelize = new Sequelize(process.env[config.use_env_variable]);
  } else {
    sequelize = new Sequelize(
      config.database, config.username, config.password, config,
    );
  }
  
  fs
    .readdirSync(__dirname)
    .filter(file =>
      (file.indexOf('.') !== 0) &&
      (file !== basename) &&
      (file.slice(-3) === '.js'))
    .forEach(file => {
      const model = sequelize.import(path.join(__dirname, file));
      db[model.name] = model;
    });
  
  Object.keys(db).forEach(modelName => {
    if (db[modelName].associate) {
      db[modelName].associate(db);
    }
  });
  
  db.sequelize = sequelize;
  db.Sequelize = Sequelize;
  
  module.exports = db;
  