Creating an API with Rails, Doorkeeper, and Grape

## _messages.html.erb
<!-- app/views/shared/_messages.html.erb -->

<% unless flash.empty? %>
  <div id='flash-messages'>
    <% flash.each do |name, message| %>
      <div class="flash alert-box <%= flash_class(name) %>" data-alert=''>
        <%= message %>
        <a href='#' class='close'>&times;</a>
      </div>
    <% end %>
  </div>
<% end %>

## application.html.erb
<!-- app/views/layouts/application.html.erb -->

<!DOCTYPE html>
<html>
  <head>
    <title>ApiSample</title>
    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track' => true %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
    <%= csrf_meta_tags %>
  </head>
  <body>
    <%= render 'shared/messages' %>
    <%= yield %>
  </body>
</html>

## application_helper.rb
# app/helpers/application_helper.rb

module ApplicationHelper
  def flash_class(key)
    case key
    when 'notice' then 'info'
    when 'success' then 'success'
    when 'alert' then 'warning'
    when 'error' then 'alert'
    end
  end
end

## development.rb
# config/environments/development.rb

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # Ommited for brevity

  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
end

## devise_install.sh
$ rails generate devise:install

## devise_model.sh
$ rails generate devise user
$ rake db:migrate

## Gemfile
source 'https://rubygems.org'

gem 'rails', '4.1.6'
gem 'sqlite3'
gem 'sass-rails', '~> 4.0.3'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0',          group: :doc
gem 'spring',        group: :development

# Gems we're going to use
gem 'devise'
gem 'doorkeeper'
gem 'grape'

## home_controller.rb
# app/controllers/home_controller.rb

class HomeController < ApplicationController
  def index
  end
end

## index.html.erb
<!-- app/views/home/index.html.erb -->

<h1>Welcome!</h1>

## rails_new.sh
$ rails new api

## routes.rb
# config/routes.rb

Rails.application.routes.draw do
  root 'home#index'
end