implement get email_template

.gitignore

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 .idea/
 .rspec
+.gitignore
+*.sqlite3

Gemfile

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+source 'http://rubygems.org'
+
+# service
+gem 'activerecord'
+gem 'sqlite3'
+gem 'sinatra'
+
+# client
+gem 'json'
+gem 'typhoeus'
+
+# testing
+gem 'rspec'
+gem 'rack-test'

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    activemodel (4.2.6)
+      activesupport (= 4.2.6)
+      builder (~> 3.1)
+    activerecord (4.2.6)
+      activemodel (= 4.2.6)
+      activesupport (= 4.2.6)
+      arel (~> 6.0)
+    activesupport (4.2.6)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    arel (6.0.3)
+    builder (3.2.2)
+    diff-lcs (1.2.5)
+    ethon (0.9.0)
+      ffi (>= 1.3.0)
+    ffi (1.9.10)
+    i18n (0.7.0)
+    json (1.8.3)
+    minitest (5.8.4)
+    rack (1.6.4)
+    rack-protection (1.5.3)
+      rack
+    rack-test (0.6.3)
+      rack (>= 1.0)
+    rspec (3.4.0)
+      rspec-core (~> 3.4.0)
+      rspec-expectations (~> 3.4.0)
+      rspec-mocks (~> 3.4.0)
+    rspec-core (3.4.4)
+      rspec-support (~> 3.4.0)
+    rspec-expectations (3.4.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.4.0)
+    rspec-mocks (3.4.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.4.0)
+    rspec-support (3.4.1)
+    sinatra (1.4.7)
+      rack (~> 1.5)
+      rack-protection (~> 1.4)
+      tilt (>= 1.3, < 3)
+    sqlite3 (1.3.11)
+    thread_safe (0.3.5)
+    tilt (2.0.2)
+    typhoeus (1.0.2)
+      ethon (>= 0.9.0)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activerecord
+  json
+  rack-test
+  rspec
+  sinatra
+  sqlite3
+  typhoeus
+
+BUNDLED WITH
+   1.11.2

Rakefile

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+require 'rubygems'
+require 'active_record'
+require 'yaml'
+require 'logger'
+
+desc 'Load the environment'
+task :environment do
+  env = ENV['SINATRA_ENV'] || 'development'
+  databases = YAML.load_file('config/database.yml')
+  ActiveRecord::Base.establish_connection(databases[env])
+end
+
+namespace :db do
+  desc 'Migrate the database'
+  task(migrate: :environment) do
+    ActiveRecord::Base.logger = Logger.new(STDOUT)
+    ActiveRecord::Migration.verbose = true
+    ActiveRecord::Migrator.migrate('db/migrate')
+  end
+end

config/database.yml

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+development:
+  adapter: sqlite3
+  database: db/development.sqlite3
+  pool: 5
+  timeout: 5000
+
+test:
+  adapter: sqlite3
+  database: db/test.sqlite3
+  pool: 5
+  timeout: 5000

db/migrate/001_create_email_templates.rb

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+class CreateEmailTemplates < ActiveRecord::Migration
+  def change
+    create_table :email_templates do |t|
+      t.string :title
+      t.text :body
+
+      t.timestamps null: false
+    end
+  end
+end

models/email_template.rb

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+class EmailTemplate < ActiveRecord::Base
+  validates_presence_of :title, :body
+end

service.rb

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+# service.rb - contains the entire service
+require 'active_record'
+require 'sinatra'
+require_relative 'models/email_template'
+require 'logger'
+
+# setting up a logger. levels: DEBUG < INFO < WARN < ERROR < FATAL < UNKNOWN
+log = Logger.new(STDOUT)
+log.level == Logger::DEBUG
+
+# setting up the environment
+env_index = ARGV.index("-e")
+env_arg = ARGV[env_index + 1] if env_index
+env = env_arg || ENV['SINATRA_ENV'] || 'development'
+log.debug "env: #{env}"
+
+# connecting to database
+use ActiveRecord::ConnectionAdapters::ConnectionManagement # close connection to the DDBB properly
+databases = YAML.load_file('config/database.yml')
+ActiveRecord::Base.establish_connection(databases[env])
+log.debug "#{databases[env]['database']} database connection established."
+
+# # create a fixture data for test env only
+# if env == 'test'
+#   EmailTemplate.delete_all
+#   EmailTemplate.create(id: 1, title: 'Fixture data title', body: 'Fixture data body')
+#   log.debug 'fixture data created in test database.'
+# end
+
+# HTTP entry points
+
+# get an email template by id
+get '/api/v1/templates/:id' do
+  email_template = EmailTemplate.find_by(id: params[:id])
+  if email_template
+    email_template.to_json
+  else
+    error 404, {error: 'Template not found'}.to_json
+  end
+end

spec/service_spec.rb

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+ENV['SINATRA_ENV'] = 'test'
+
+require File.dirname(__FILE__) + '/../service'
+require 'rspec'
+require 'rack/test'
+
+RSpec.configure do |conf|
+  conf.include Rack::Test::Methods
+end
+
+def app
+  Sinatra::Application
+end
+
+describe 'service' do
+  before(:each) do
+    EmailTemplate.delete_all
+  end
+
+  describe 'GET on api/v1/templates/:id' do
+    before(:each) do
+      EmailTemplate.create(
+        id: 130516,
+        title: 'Test title template',
+        body: 'Test body for email template'
+      )
+    end
+
+    it 'returns an email template by id' do
+      get '/api/v1/templates/130516'
+      expect(last_response).to be_ok
+      attributes = JSON.parse(last_response.body)
+      expect(attributes['id']).to eq(130516)
+    end
+
+    it 'returns an email template with title' do
+      get '/api/v1/templates/130516'
+      expect(last_response).to be_ok
+      attributes = JSON.parse(last_response.body)
+      expect(attributes['title']).to eq('Test title template')
+    end
+
+    it 'returns an email template with body' do
+      get '/api/v1/templates/130516'
+      expect(last_response).to be_ok
+      attributes = JSON.parse(last_response.body)
+      expect(attributes['body']).to eq('Test body for email template')
+    end
+
+    it "returns 404 for an email template that does'n exist" do
+      get '/api/v1/templates/foo'
+      expect(last_response.status).to be 404
+    end
+  end
+end