models/ .js files

+module.exports = (sequelize, DataTypes) => (
+  sequelize.define('auction', {
+    bid: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+      defaultValue: 0,
+    },
+    msg: {
+      type: DataTypes.STRING(100),
+      allowNull: true,
+    },
+  }, {
+    timestamps: true,
+    paranoid: true,
+  })
+);

+module.exports = (sequelize, DataTypes) => (
+  sequelize.define('good', {
+    name: {
+      type: DataTypes.STRING(40),
+      allowNull: false,
+    },
+    img: {
+      type: DataTypes.STRING(200),
+      allowNull: true,
+    },
+    price: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+      defaultValue: 0,
+    },
+  }, {
+    timestamps: true,
+    paranoid: true,
+  })
+);

+const Sequelize = require('sequelize');
+
+const env = process.env.NODE_ENV || 'development';
+const config = require('../config/config')[env];
+const db = {};
+
+const sequelize = new Sequelize(
+  config.database, config.username, config.password, config,
+);
+
+db.sequelize = sequelize;
+db.Sequelize = Sequelize;
+db.User = require('./user')(sequelize, Sequelize);
+db.Good = require('./good')(sequelize, Sequelize);
+db.Auction = require('./auction')(sequelize, Sequelize);
+
+db.Good.belongsTo(db.User, { as: 'owner' });
+db.Good.belongsTo(db.User, { as: 'sold' });
+db.User.hasMany(db.Auction);
+db.Good.hasMany(db.Auction);
+db.Auction.belongsTo(db.User);
+db.Auction.belongsTo(db.Good);
+
+module.exports = db;

+module.exports = (sequelize, DataTypes) => (
+  sequelize.define('user', {
+    email: {
+      type: DataTypes.STRING(40),
+      allowNull: false,
+      unique: true,
+    },
+    nick: {
+      type: DataTypes.STRING(15),
+      allowNull: false,
+    },
+    password: {
+      type: DataTypes.STRING(100),
+      allowNull: true,
+    },
+    money: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+      defaultValue: 0,
+    },
+  }, {
+    timestamps: true,
+    paranoid: true,
+  })
+);