########################################################################################## ############################################# ############################################# ########################################################################################## ############################################# ############################################# ########################################################################################## Getting_started:

• $ rails new taxi
• $ cd taxi

#############################################

Dependencies:

$ echo "gem 'devise'" >> Gemfile

$ echo "gem 'omniauth'" >> Gemfile

$ bundle install

$ rails generate devise:install

#############################################

Models:

  rails g devise User
  rails g devise:views 
  rails g migration add_meta_to_users meta_id:integer meta_type
  rails g scaffold Client name phone lat:float lng:float
  rails g scaffold Driver name phone car_model lat:float lng:float
  rails g model Corrida client_id:integer driver_id:integer address
  rails g controller Corridas create update
  rails g controller welcome index
  rake db:migrate

############################################# ############################################# Migration

// ActiveRecord::Schema.define(version: 20140818105408) do create_table "clients", force: true do |t| t.string "name" t.integer "phone" t.datetime "created_at" t.datetime "updated_at" end

    create_table "drivers", force: true do |t|
      t.string   "name"
      t.string   "phone"
      t.string   "car_model"
      t.datetime "created_at"
      t.datetime "updated_at"
    end
  
    create_table "users", force: true do |t|
      t.string   "email",                  default: "", null: false
      t.string   "encrypted_password",     default: "", null: false
      t.string   "reset_password_token"
      t.datetime "reset_password_sent_at"
      t.datetime "remember_created_at"
      t.integer  "sign_in_count",          default: 0,  null: false
      t.datetime "current_sign_in_at"
      t.datetime "last_sign_in_at"
      t.string   "current_sign_in_ip"
      t.string   "last_sign_in_ip"
      t.datetime "created_at"
      t.datetime "updated_at"
      t.integer  "meta_id"
      t.string   "meta_type"
  
    add_index "users", ["email"], name: "index_users_on_email", unique: true
    add_index "users", ["meta_id", "meta_type"], name: "index_users_on_meta_id_and_meta_type"
    add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
  
  end

Classes:

  class User < ActiveRecord::Base
    # Include default devise modules. Others available are:
    # :confirmable, :lockable, :timeoutable and :omniauthable
    devise :database_authenticatable, :registerable,
           :recoverable, :rememberable, :trackable, :validatable
           
  belongs_to :meta, polymorphic: true 
    
  end

  class Client < ActiveRecord::Base
    has_one :user, as: :meta, dependent: :destroy
    accepts_nested_attributes_for :user
    
    validates :name, presence: true
    validates :phone, presence: true
  
  end

  class Driver < ActiveRecord::Base
    has_one :user, as: :meta, dependent: :destroy
    accepts_nested_attributes_for :user
    
    validates :name, presence: true
    validates :phone, presence: true
  validates :car_model presence: true
  end

########################################## Controllers: ####################################### /app/controllers/clients_controller.rb

class ClientsController < ApplicationController

 #devise stuff
 before_action :authenticate_user!, :authenticate_client, except: [:new, :create, :update, :show]
 before_action :new_registration, only: [:new, :create]
 before_action :set_client, only: [:show, :edit, :update, :destroy]

//auto-generates

 private
   # Callbacks:
   
   #Find
   def set_client
     @client = Client.find(params[:id])
   end

   # Strong parameters
   def client_params
     params.require(:client).permit(:name, :phone, user_attributes: [ :id, :email, :password, :password_confirmation ])
   end
   
   def authenticate_client     
     redirect_to(new_user_session_path) unless current_user.meta_type == "Client"  
   end
   
   def new_registration
     redirect_to(clients_path) if user_signed_in?
   end

end

####################################### /app/controllers/drivers_controller.rb

class DriversController < ApplicationController

 #devise stuff
 before_action :authenticate_user!, :authenticate_driver, except: [:new, :create, :update, :show]
 before_action :new_registration, only: [:new, :create]
 before_action :set_driver, only: [:show, :edit, :update, :destroy]

 private
   # Callbacks:
   
   #Find
   def set_driver
     @driver = Driver.find(params[:id])
   end

   # Strong parameters
   def driver_params
     params.require(:driver).permit(:name, :phone, :car_model, user_attributes: [ :id, :email, :password, :password_confirmation ])
   end
   
   def authenticate_driver     
     redirect_to(new_user_session_path) unless current_user.meta_type == "Driver"  
   end
   
   def new_registration
     redirect_to(drivers_path) if user_signed_in?
   end

end

################################################### Routes:

 devise_for :users, :skip => [:registrations]
 resources :clients
 resources :drivers
 root 'welcome#index'

#############################

Dúvidas: /config/initializers/devise.rb (Scopes configuration)