Adding the base for the currency system

currency/dbObjects.js

@@ -0,0 +1,47 @@
+const Sequelize = require('sequelize');
+
+/*
+ * Make sure you are on at least version 5 of Sequelize! Version 4 as used in this guide will pose a security threat.
+ * You can read more about this issue on the [Sequelize issue tracker](https://github.com/sequelize/sequelize/issues/7310).
+ */
+
+const sequelize = new Sequelize('database', 'username', 'password', {
+	host: 'localhost',
+	dialect: 'sqlite',
+	logging: false,
+	storage: 'database.sqlite',
+});
+
+const Users = require('./models/Users.js')(sequelize, Sequelize.DataTypes);
+const CurrencyShop = require('./models/CurrencyShop.js')(sequelize, Sequelize.DataTypes);
+const UserItems = require('./models/UserItems.js')(sequelize, Sequelize.DataTypes);
+
+UserItems.belongsTo(CurrencyShop, { foreignKey: 'item_id', as: 'item' });
+
+Reflect.defineProperty(Users.prototype, 'addItem', {
+	/* eslint-disable-next-line func-name-matching */
+	value: async function addItem(item) {
+		const userItem = await UserItems.findOne({
+			where: { user_id: this.user_id, item_id: item.id },
+		});
+
+		if (userItem) {
+			userItem.amount += 1;
+			return userItem.save();
+		}
+
+		return UserItems.create({ user_id: this.user_id, item_id: item.id, amount: 1 });
+	},
+});
+
+Reflect.defineProperty(Users.prototype, 'getItems', {
+	/* eslint-disable-next-line func-name-matching */
+	value: function getItems() {
+		return UserItems.findAll({
+			where: { user_id: this.user_id },
+			include: ['item'],
+		});
+	},
+});
+
+module.exports = { Users, CurrencyShop, UserItems };