text: const fs = require('fs');
  const path = require('path');
  const Sequelize = require('sequelize');
  
  const basename = path.basename(__filename);
  const env = process.env.NODE_ENV || 'development';
  const config = require('../../sequelize.config')[env];
  
  const db = {};
  
  let sequelize;
  if (config.use_env_variable) {
  	sequelize = new Sequelize(process.env[config.use_env_variable], config);
  } 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 = require(path.join(__dirname, file))(sequelize, Sequelize.DataTypes);
  		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;
  