Create and show database objects in when running the app

.gitignore

@@ -0,0 +1 @@
+*schema.rb

Dockerfile

@@ -1,11 +1,9 @@
 FROM openshift/ruby-20-centos
 
-# Install mysql client and gems to connect app to database.
-USER root
-RUN yum install -y mysql && gem install sinatra activerecord mysql2 --no-ri --no-rdoc
+RUN gem install sinatra sinatra-activerecord mysql2 --no-ri --no-rdoc
 
-USER ruby
-ADD app.rb /tmp/app.rb
+ADD sinatra_app /tmp/
+WORKDIR /tmp/
 
 EXPOSE 8080
-CMD ["ruby", "/tmp/app.rb"]
+CMD ["ruby", "start.rb"]

sinatra_app/Rakefile

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+require_relative 'app'
+require 'sinatra/activerecord/rake'

sinatra_app/app.rb

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+require 'sinatra'
+require_relative 'config/environments'
+require_relative 'models'
+
+set :bind, '0.0.0.0'
+set :port, ENV["FRONTEND_SERVICE_PORT"]
+
+get '/' do
+  Timestamp.create(date: Time.now, text: "This is a message from a database query. The last insertion in the database was at")
+  "Hello World!\n"+
+  # ENV values are generated during template processing
+  # and then passed to the container when openshift launches it.
+  "All the environment variables are: #{ENV.map { |k,v| "#{k}=#{v}" }.join("\n")}]\n" +
+  "#{Timestamp.last().text} #{Timestamp.last().date}."
+end

sinatra_app/config/database.yml

@@ -0,0 +1,7 @@
+development:
+  adapter: mysql2
+  database: <%= ENV["MYSQL_DATABASE"] %>
+  username: root
+  password: <%= ENV['MYSQL_ROOT_PASSWORD'] %>
+  host: <%= ENV["DATABASE_SERVICE_IP_ADDR"] %>
+  port: <%= ENV["DATABASE_SERVICE_PORT"] %>

sinatra_app/config/environments.rb

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+require 'sinatra/activerecord'
+
+def self.connect_to_database
+  begin
+    ActiveRecord::Base.establish_connection(
+      :adapter  => "mysql2",
+      :host     => "#{ENV["DATABASE_SERVICE_IP_ADDR"]}",
+      :port     => "#{ENV["DATABASE_SERVICE_PORT"]}",
+      :database => "#{ENV["MYSQL_DATABASE"]}",
+      :password => "#{ENV["MYSQL_ROOT_PASSWORD"]}"
+    )
+
+    ActiveRecord::Base.connection.active?
+
+  rescue Exception
+    return false
+  end
+end
+
+configure :development do
+
+  while !self.connect_to_database
+    puts "Connecting to database...\n"
+    sleep 0.1
+  end
+  puts "Connected to database"
+end

sinatra_app/db/migrate/1414364400_create_timestamp.rb

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+class CreateTimestamp < ActiveRecord::Migration
+  def up
+    create_table :timestamps do |t|
+        t.date :date
+        t.text :text
+    end
+  end
+
+  def down
+    drop_table :timestamps
+  end
+end

sinatra_app/models.rb

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+require 'active_record'
+
+class Timestamp < ActiveRecord::Base
+end

sinatra_app/start.rb

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+puts "Create database..."
+%x"rake db:create"
+puts "Run migrations..."
+%x"rake db:migrate"
+puts "Run app..."
+%x"ruby app.rb &>/dev/null &"