_form.html.slim

= simple_form_for(@article) do |f|
  = f.error_notification

  .form-inputs
    = f.uploads_one :image, preview: :regular
    = f.input :title
    = f.association :category, prompt: 'Selecione'
    = f.input :body
    = f.input :published_at

  .form-actions
    = f.button :submit, class: 'btn btn-primary'

application.coffee

#= require jquery
#= require jquery_ujs
#= require bootstrap
#= require uploadbox

application.html.slim

doctype html
html
  head
    meta name="viewport" content="width=device-width, initial-scale=1.0"
    title Paporeto
    = stylesheet_link_tag    "application", media: "all", "data-turbolinks-track" => true
    = csrf_meta_tags

    /[if lt IE 9]
      = javascript_include_tag "html5shiv", "data-turbolinks-track" => true
      = javascript_include_tag "respond.min", "data-turbolinks-track" => true
  body
    - if user_signed_in?
      .navbar.navbar-inverse.navbar-fixed-top
        .container
          .navbar-header
             = link_to 'Paporeto', root_path, class: 'navbar-brand'
          .navbar-collapse
            ul.nav.navbar-nav
              li class="#{nav_status('articles')}" = link_to 'Artigos', articles_path
              li class="#{nav_status('categories')}" = link_to 'Categorias', categories_path
              li class="#{nav_status('users')}" = link_to 'Usuários', users_path
            ul.nav.navbar-nav.pull-right
              li = link_to current_user.name, edit_user_path(current_user)
              li = link_to 'Sair', destroy_user_session_path, method: :delete

    .container
      - if notice
        .alert.alert-info.alert-dismissable
          button type="button" class="close" data-dismiss="alert" aria-hidden="true" × 
          = notice

      = yield
    = javascript_include_tag "application", "data-turbolinks-track" => true

application.sass

@import "bootstrap"
@import "uploadbox"

body
  margin: 60px 0

textarea.form-control
  height: 250px

select.form-control
  width: 120px
  display: inline-block

input[type="checkbox"].form-control
  display: inline
  width: auto
  height: auto
  padding: 0
  box-shadow: none

label.control-label
  padding: 0

article.rb

class Article < ActiveRecord::Base
  validates :title, :category, :published_at, presence: true
  belongs_to :category
  uploads_one :image, thumb: [90, 80], small: [260, 195], regular: [580, 240], full: [1280, 493]
end

articles_controller.rb

class ArticlesController < ApplicationController
  before_action :set_article, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_user!

  # GET /articles
  def index
    @articles = Article.order(published_at: :desc).order(:title)
  end

  # GET /articles/1
  def show
  end

  # GET /articles/new
  def new
    @article = Article.new
  end

  # GET /articles/1/edit
  def edit
  end

  # POST /articles
  def create
    @article = Article.new(article_params)
    
    if @article.save
      redirect_to @article, notice: 'Artigo salvo.'
    else
      render action: 'new'
    end
  end

  # PATCH/PUT /articles/1
  def update
    if @article.update(article_params)
      redirect_to @article, notice: 'Artigo salvo.'
    else
      render action: 'edit'
    end
  end

  # DELETE /articles/1
  def destroy
    @article.destroy
    redirect_to articles_url, notice: 'Artigo excluído.'
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_article
      @article = Article.find(params[:id])
    end

    # Only allow a trusted parameter "white list" through.
    def article_params
      params.require(:article).permit(:title, :body, :published_at, :category_id, :image)
    end
end

create_images.rb

class CreateImages < ActiveRecord::Migration
  def change
    create_table :images do |t|
      t.string :file
      t.references :imageable, polymorphic: true, index: true
      t.integer :width
      t.integer :height
      t.boolean :retina, default: false
      t.string :upload_name
      t.string :secure_random, index: true

      t.timestamps
    end
  end
end

Gemfile

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.1'

# Use sqlite3 as the database for Active Record
gem 'sqlite3', '~> 1.3.8'

# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'

# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'

# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'

# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails', '~> 3.1.0'

# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks', '~> 2.2.1'

# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
# gem 'jbuilder', '~> 1.2'

gem 'simple_form', '~> 3.0.1'
gem 'slim-rails', '~> 2.1.0'

gem 'xray-rails', '~> 0.1.12', group: :development
gem 'pry-rails', '~> 0.3.2', group: :development

gem 'start', '~> 0.1.1'

gem 'devise', '~> 3.2.2'

# upload
gem 'uploadbox', '0.1.3'

routes.rb

Paporeto::Application.routes.draw do
  mount Uploadbox::Engine => '/uploadbox', as: :uploadbox
  devise_for :users
  resources :categories, except: :show

  resources :articles
  resources :users, except: :show

  root 'articles#index'

  # The priority is based upon order of creation: first created -> highest priority.
  # See how all your routes lay out with "rake routes".

  # You can have the root of your site routed with "root"
  # root 'welcome#index'

  # Example of regular route:
  #   get 'products/:id' => 'catalog#view'

  # Example of named route that can be invoked with purchase_url(id: product.id)
  #   get 'products/:id/purchase' => 'catalog#purchase', as: :purchase

  # Example resource route (maps HTTP verbs to controller actions automatically):
  #   resources :products

  # Example resource route with options:
  #   resources :products do
  #     member do
  #       get 'short'
  #       post 'toggle'
  #     end
  #
  #     collection do
  #       get 'sold'
  #     end
  #   end

  # Example resource route with sub-resources:
  #   resources :products do
  #     resources :comments, :sales
  #     resource :seller
  #   end

  # Example resource route with more complex sub-resources:
  #   resources :products do
  #     resources :comments
  #     resources :sales do
  #       get 'recent', on: :collection
  #     end
  #   end
  
  # Example resource route with concerns:
  #   concern :toggleable do
  #     post 'toggle'
  #   end
  #   resources :posts, concerns: :toggleable
  #   resources :photos, concerns: :toggleable

  # Example resource route within a namespace:
  #   namespace :admin do
  #     # Directs /admin/products/* to Admin::ProductsController
  #     # (app/controllers/admin/products_controller.rb)
  #     resources :products
  #   end
end

show.html.slim

h1 
  = @article.title
  .pull-right
    = link_to 'Editar', edit_article_path(@article), class: 'btn btn-default'

hr

strong = @article.category.name
p = l @article.published_at

p = img @article.image.regular if @article.image?
= simple_format @article.body

uploadbox.rb

Uploadbox.retina         = true
Uploadbox.retina_quality = 30
Uploadbox.image_quality  = 70

if Rails.env.production?
  REDIS = Redis.connect(url: ENV["REDISCLOUD_URL"])
  Resque.redis = REDIS
  Resque.after_fork = Proc.new { ActiveRecord::Base.establish_connection }
end

CarrierWave.configure do |config|
  config.storage = :fog

  config.fog_credentials = {
    provider:               'AWS',
    aws_access_key_id:      ENV['S3_KEY'],
    aws_secret_access_key:  ENV['S3_SECRET']
  }

  config.fog_directory  = ENV['S3_BUCKET']
  config.fog_attributes = {'Cache-Control'=>'max-age=315576000'}
end

if Rails.env.test?
  CarrierWave.configure do |config|
    config.storage :file
    config.enable_processing = false
  end
end