Quick RESTful API

.bundle/config

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+---
+BUNDLE_WITHOUT: production

.gitignore

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+db/*.db

Gemfile

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+source 'https://rubygems.org'
+ruby "2.2.2"
+
+gem 'activerecord'
+gem 'sinatra'
+
+gem 'sinatra-activerecord'
+
+group :production do
+  gem 'pg'
+end
+
+group :development do
+  gem 'sqlite3'
+  gem 'rerun'
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (4.2.4)
+      activesupport (= 4.2.4)
+      builder (~> 3.1)
+    activerecord (4.2.4)
+      activemodel (= 4.2.4)
+      activesupport (= 4.2.4)
+      arel (~> 6.0)
+    activesupport (4.2.4)
+      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)
+    ffi (1.9.10)
+    i18n (0.7.0)
+    json (1.8.3)
+    listen (3.0.3)
+      rb-fsevent (>= 0.9.3)
+      rb-inotify (>= 0.9)
+    minitest (5.8.1)
+    pg (0.18.3)
+    rack (1.6.4)
+    rack-protection (1.5.3)
+      rack
+    rb-fsevent (0.9.6)
+    rb-inotify (0.9.5)
+      ffi (>= 0.5.0)
+    rerun (0.11.0)
+      listen (~> 3.0)
+    sinatra (1.4.6)
+      rack (~> 1.4)
+      rack-protection (~> 1.4)
+      tilt (>= 1.3, < 3)
+    sinatra-activerecord (2.0.9)
+      activerecord (>= 3.2)
+      sinatra (~> 1.0)
+    sqlite3 (1.3.11)
+    thread_safe (0.3.5)
+    tilt (2.0.1)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activerecord
+  pg
+  rerun
+  sinatra
+  sinatra-activerecord
+  sqlite3
+
+BUNDLED WITH
+   1.10.6

Rakefile

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+require './app'
+require 'sinatra/activerecord/rake'
+
+desc 'Starts the development server'
+task :serve do
+  `bundle exec rerun -b rackup`
+end

app.rb

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+require 'rubygems'
+require 'bundler'
+require 'bundler/setup'
+Bundler.require
+
+require './config/environments'
+
+require './model/joke'
+
+before do
+  content_type :json
+  response.headers['Access-Control-Allow-Origin'] = '*'
+end
+
+get '/jokes' do
+  Joke.all.to_json
+end
+
+post '/jokes' do
+  @joke = Joke.new(params[:joke])
+
+  if @joke.save
+    status 204
+  else
+    status 422
+  end
+end
+
+get '/jokes/:id' do
+  begin
+    @joke = Joke.find(params[:id])
+  rescue Exception
+    status 404
+    return
+  end
+
+  @joke.to_json
+end
+
+put '/jokes/:id' do
+  begin
+    @joke = Joke.find(params[:id])
+  rescue Exception
+    status 404
+    return
+  end
+
+  if @joke.update(params[:joke])
+    status 204
+  else
+    status 422
+  end
+end
+
+delete '/jokes/:id' do
+  begin
+    @joke = Joke.find(params[:id])
+
+    @joke.delete
+  rescue Exception
+  end
+
+  status 204
+end

config.ru

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+require './app'
+run Sinatra::Application

config/environments.rb

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+configure :development do
+ set :database, 'sqlite3:db/development.db'
+end
+
+configure :production do
+  db = URI.parse(ENV['DATABASE_URL'] || 'postgres:///localhost/mydb')
+
+  ActiveRecord::Base.establish_connection(
+   :adapter  => db.scheme == 'postgres' ? 'postgresql' : db.scheme,
+   :host     => db.host,
+   :username => db.user,
+   :password => db.password,
+   :database => db.path[1..-1],
+   :encoding => 'utf8'
+  )
+end

db/migrate/20151012185754_create_jokes.rb

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+class CreateJokes < ActiveRecord::Migration
+  def change
+    create_table :jokes do |t|
+      t.string :joke
+
+      t.timestamps null: false
+    end
+  end
+end

db/migrate/20151012201008_add_punchline_to_jokes.rb

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+class AddPunchlineToJokes < ActiveRecord::Migration
+  def change
+    add_column :jokes, :punchline, :string
+  end
+end

db/schema.rb

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+# encoding: UTF-8
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 20151012201008) do
+
+  create_table "jokes", force: :cascade do |t|
+    t.string   "joke"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string   "punchline"
+  end
+
+end

model/joke.rb

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+class Joke < ActiveRecord::Base
+
+end