text: 'use strict';
  
  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(__dirname + '/../config/config.json')[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 => {
          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;
      });
  
  Object.keys(db).forEach(modelName => {
      if (db[modelName].associate) {
          db[modelName].associate(db);
      }
  });
  
  db.sequelize = sequelize;
  db.Sequelize = Sequelize;
  
  const User = require("./User");
  const Post = require("./Post");
  const Comment = require("./Comment");
  
  //User to Post
  User.hasMany(Post, { as: "post" });
  Post.belongsTo(User, {
      foreignKey: "userId",
      as: "user"
  });
  
  //Post to Comment & User to Comment
  Post.hasMany(Comment, { as: "comment" });
  Comment.belongsTo(Post, {
      foreignKey: "postId",
      as: "post",
  });
  
  module.exports = db;