express-sequelize-backend-template/models/index.js

"use strict";
const fs = require("fs");
const path = require("path");
const Sequelize = require("sequelize");
const logger = require("../utils/logger")(module);
const basename = path.basename(__filename);
const env = process.env.NODE_ENV || "development";
const config = require(__dirname + "/../config/sequelize.js")[env];
const db = {};

// Create new Sequelize instance
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);
}

sequelize.authenticate()
  .then(
    () => {
      logger.info('Sequelize auth success');
    },
    (err) => {
      logger.error('Sequelize auth error', { err });
    }
  )

// Read model definitions from folder
fs
  .readdirSync(__dirname)
  .filter(file => {
    return (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;
  });

// Setup defined associations
Object.keys(db).forEach(modelName => {
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});

db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = db;