ar-mapping-custom-pk-fk

scratch.rb

# frozen_string_literal: true

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'pry'
  gem "sqlite3"
  gem 'activerecord'
end

require 'active_record'
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :bookings, primary_key: :booking_id, force: true do |t|
    t.datetime :start_date, null: false
    t.datetime :end_date, null: false
    t.belongs_to :room, null: false
    t.belongs_to :guest, null: false
  end

  create_table :rooms, primary_key: :room_id, force: true do |t|
    t.integer :room_number, null: false, default: 1, unique: true
    t.string :room_type, null: false, default: 'standard_room'
  end

  create_table :guests, primary_key: :guest_id, force: true do |t|
    t.string :guest_name, null: false
    t.string :guest_passport_no, null: false, unique: true
    t.string :guest_phone, null: false , unique: true
  end

  add_foreign_key :bookings, :rooms, column: :room_id, primary_key: :room_id
  add_foreign_key :bookings, :guests, column: :guest_id, primary_key: :guest_id
end

class Booking < ActiveRecord::Base
  self.primary_key = :booking_id
  belongs_to :room
  belongs_to :guest
end

class Guest < ActiveRecord::Base
  self.primary_key = :guest_id
  has_many :bookings
end

class Room < ActiveRecord::Base
  self.primary_key = :room_id
  has_many :bookings
end

Booking.create!(
  start_date: Date.new,
  end_date: Date.new,
  room: Room.create,
  guest: Guest.create(guest_name: :sth, guest_passport_no: :sth, guest_phone: :sth)
)

require 'pry'

binding.pry

I wanted to try this on docker:

Dockerfile

FROM ruby:3.0

WORKDIR /usr/src/app

RUN gem install 'pry' && gem install 'sqlite3' && gem install 'activerecord'

COPY . .

# CMD ["./scratch.rb"]

Then build and run:

docker build -t active_record_playground .

docker run -it active_record_playground ruby scratch.rb