limjiechao / ordoo-server

Mock Interview Take-Home Assigment Part 1

README

This repository contains my solution to Ordoo.

Deployment Instructions

Local deployment

Clone or download this repository into a directory. Then run the following in the project directory:

bundle install
rails s

Heroku deployment

heroku create
git push heroku master
heroku run rails db:migrate
heroku run rails db:seed
heroku open

Database creation and initialization

Run the following in the shown order:

rails db:create
rails db:migrate
rails db:seed

Development Log

Initialization

Create a new Rails project:

rails new ordoo --database=postgresql

Workaround for ffi (1.9.21) installation error

An error occurred while installing ffi (1.9.21), and Bundler cannot continue.

This is a workaround. Add the following to Gemfile:

gem 'ffi', '1.9.18'

Then run:

bundle install

Create .gitignore before pushing to remote repository

Update .gitignore to push only necessary files to Github.

Push to remote repository

Create a new repository on Github. Then, run the following commands in project directory:

git add .
git commit -am "initial setup"
git remote add origin <INSERT YOUR REMOTE REPOSITORY URL>
git push -u origin master

Generating models

Generate the models in the following order:

rails g model DeliveryOrder order_id:string serving_datetime:datetime
rails g model Meal name:string description:string
rails g model OrderItem delivery_order:references meal:references quantity:integer unit_price:integer

Update associations in models

For DeliveryOrder, allow order_id to be stored as null even though it is validated for uniqueness.

validates :order_id, uniqueness: true, allow_nil: true

As there is no id before DeliveryOrder.create(), this allows the order_id to be created from id after it has been saved.

Create database and run migrations

rails db:create
rails db:migrate

Seed the database

Clearing the database before seeding

The following commands delete the tables in a sequence opposite from migration. Compared to Rake::Task['db:reset'].invoke, this approach can be run locally and remotely on Heroku. The user does not have to run heroku pg:reset DATABASE remotely before seeding the database on Heroku.

OrderItem.delete_all
Meal.delete_all
DeliveryOrder.delete_all

Make sure the database has no active session before running the following command as the database will first be dropped before seeding.

rails db:seed

Create Orders controller

rails g controller orders index show --no-stylesheets --no-javascripts --no-assets --n
o-test-framework --no-helper