Added some tests (createOne and getAll)

models/brands.js

@@ -0,0 +1,19 @@
+module.exports = (sequelize, DataTypes) => {
+  const Brands = sequelize.define(
+    "Brands",
+    {
+      name: DataTypes.STRING
+    },
+    {}
+  );
+
+  Brands.associate = function(models) {
+    Brands.hasMany(models.Cars, {
+      as: "Cars",
+      foreignKey: "brandId",
+      sourceKey: "id"
+    });
+  };
+
+  return Brands;
+};

models/cards.js

@@ -0,0 +1,27 @@
+module.exports = (sequelize, DataTypes) => {
+  const Cars = sequelize.define(
+    "Cars",
+    {
+      name: DataTypes.STRING,
+      year: DataTypes.INTEGER,
+      active: DataTypes.BOOLEAN,
+      brandId: {
+        type: DataTypes.INTEGER,
+        references: {
+          model: "Brands",
+          key: "id"
+        }
+      }
+    },
+    {}
+  );
+
+  Cars.associate = function(models) {
+    Cars.belongsTo(models.Brands, {
+      as: "Brand",
+      foreignKey: "brandId"
+    });
+  };
+
+  return Cars;
+};

models/index.js

@@ -0,0 +1,43 @@
+const fs = require("fs");
+const path = require("path");
+const Sequelize = require("sequelize");
+
+const basename = path.basename(__filename);
+const env = process.env.NODE_ENV || "development";
+// eslint-disable-next-line import/no-dynamic-require
+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 = sequelize.import(path.join(__dirname, file));
+    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;