Make docker work with docker-compose

Dockerfile

@@ -0,0 +1,18 @@
+FROM ruby:2.7.2
+RUN apt-get update -qq && apt-get install -y postgresql-client
+WORKDIR /myapp
+ENV RAILS_ENV=production
+
+COPY Gemfile /myapp/Gemfile
+COPY Gemfile.lock /myapp/Gemfile.lock
+RUN bundle install
+COPY . /myapp
+
+# Add a script to be executed every time the container starts.
+COPY entrypoint.sh /usr/bin/
+RUN chmod +x /usr/bin/entrypoint.sh
+ENTRYPOINT ["entrypoint.sh"]
+EXPOSE 3000
+
+# Start the main process.
+CMD ["rails", "server", "-b", "0.0.0.0"]

Gemfile

@@ -37,6 +37,3 @@ group :development do
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
 end
-
-# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
-gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Gemfile.lock

@@ -95,7 +95,7 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
     minitest (5.14.3)
-    msgpack (1.4.1)
+    msgpack (1.4.2)
     nio4r (2.5.4)
     nokogiri (1.11.1)
       mini_portile2 (~> 2.5.0)

README.md

@@ -6,3 +6,27 @@ This is a small ongoing series that discusses what it takes to build a basic API
 
 - Read more at: [https://web-crunch.com/posts/create-a-basic-api-with-ruby-on-rails](https://web-crunch.com/posts/create-a-basic-api-with-ruby-on-rails)
 - [Subscribe to the YouTube channel](https://youtube.com/c/webcrunch)
+
+## Docker
+
+Docker has been added with docker-compose to make the execution a lot easier.
+
+To get up and running with run the following:
+
+```
+docker-commpose up
+```
+
+After the server is running, run the following command to create the database schema:
+
+```
+docker-compose exec web /myapp/bin/rails db:migrate RAILS_ENV=development
+```
+
+Next, run the following command to fill up some data from the seeds:
+
+```
+docker-compose exec web /myapp/bin/rails db:seed RAILS_ENV=development
+```
+
+Consequently, we can try `http://localhost:3000/api/v1/bands` and it should show us 5 bands and 4 members for the first band `The Beatles`.

db/seeds.rb

@@ -5,3 +5,20 @@
 #
 #   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
 #   Character.create(name: 'Luke', movie: movies.first)
+
+# creating bands from: https://www.businessinsider.com/the-100-most-popular-rock-bands-of-all-time-2018-9
+bands = Band.create([
+  {name: "The Beatles"},
+  {name: "Led Zeppelin"},
+  {name: "Queen"},
+  {name: "Pink Floyd"},
+  {name: "The Rolling Stones"}
+]);
+
+# From : https://en.wikipedia.org/wiki/List_of_members_of_bands_featuring_members_of_the_Beatles  - Nov 1956
+Member.create([
+  {name: "John Lenon", band: bands.first},
+  {name: "Eric Griffiths", band: bands.first},
+  {name: "Pete Shotton", band: bands.first},
+  {name: "Bill Smith", band: bands.first}
+])

docker-compose.yml

@@ -0,0 +1,12 @@
+version: "3.9"
+services:
+  web:
+    build: .
+    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
+    volumes:
+      - .:/myapp
+    ports:
+      - "3000:3000"
+    environment:
+      - SECRET_KEY_BASE=Qy6VTnREtzwBbzgvxY2LJA5QQwFNex4wUtj2qNTTnSXtHykdZM
+      - RAILS_ENV=development

entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+# Remove a potentially pre-existing server.pid for Rails.
+rm -f /myapp/tmp/pids/server.pid
+
+# Then exec the container's main process (what's set as CMD in the Dockerfile).
+exec "$@"