1. Desenvolvimento
Web com Ruby on
Rails
João Lucas Pereira de Santana
gtalk | linkedin | twitter: jlucasps

2. Resources
Resources são objetos que os usuários estão aptos a
acessar e realizar operações CRUD (ou um
conjunto delas)
Controllers de objetos Resources são
implementados utilizando-se os métodos (GET,
PUT, POST) defindidos no protocolo HTTP
@jlucasps
resources :messages
namespace "admin" do
resources :posts, :comments # app/controllers/admin/posts
end
resources :magazines do
resources :ads
end

3. Resources
@jlucasps
class MessagesController < ActionController::Base
# GET messages_url
def index
# return all messages
end
# GET new_message_url
def new
# return an HTML form for describing a new message
end
# POST messages_url
def create
# create a new message
end
# GET message_url(:id => 1)
def show
# find and return a specific message
end
# GET edit_message_url(:id => 1)
def edit
# return an HTML form for editing a specific message
end
# PUT message_url(:id => 1)
def update
# find and update a specific message
end
# DELETE message_url(:id => 1)
def destroy
# delete a specific message
end
end

4. Resources
@jlucasps
messages GET /messages(.:format)
messages#index
POST /messages(.:format)
messages#create
new_message GET /messages/new(.:format)
messages#new
edit_message GET /messages/:id/edit(.:format)
messages#edit
message GET /messages/:id(.:format)
messages#show
PUT /messages/:id(.:format)
messages#update
DELETE /messages/:id(.:format)
messages#destroy

5. Resources
Alterar tela index.html.erb para conter link
para listagem de usuários
@jlucasps
<div class="span9">
<% label = "<i class='icon-user'></i>&nbsp;Usuários".
html_safe %>
<%= link_to label, users_path, :class => "btn btn-large" %
>
</div><!--/span-->
<%= content_for :sidebar do %>
<%= render :partial => 'shared/sidebar' %>
<% end %>

6. Resources
Criar tela de listagem de usuários em
/app/views/users/index.html.erb
@jlucasps
<% if @users.any? %>
<% # Listagem de usuários %>
<% else %>
<div class="alert">
Nenhum usuário cadastrado
</div>
<% end %>
<%= link_to "Novo usuário", new_user_path, :class =>
"btn btn-success" %>

7. Resources
Criar controller de usuários em
/app/controllers/users_controller.rb
@jlucasps
class UsersController < ApplicationController
def index
@users = User.all
end
end

8. Resources
Tela de listagem de usuários
@jlucasps

9. Criar a action new para exibir formulário
Resources
@jlucasps
class UsersController < ApplicationController
def index
@users = User.all
end
def new
@user = User.new
end
end
<h4>Novo usuário</h4>
<%= render :partial => 'form', :locals => {:user =>
@user} %>

10. Resources
@jlucasps
/app/views/shared/_error_messages.html.erb
<% if resource.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(resource.errors.count, "error") %>
erros:</h2>
<ul>
<% resource.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>

11. Resources
Partial com formulário em /app/views/users/_form.html.erb
@jlucasps
<%= form_for(user) do |f| %>
<%= render :partial => 'shared/error_messages', :locals => {:resource => user} %
>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :email %><br />
<%= f.text_field :email %>
</div>
<div class="field">
<%= f.label :age %><br />
<%= f.number_field :age %>
</div>
<div class="field">
<%= f.label :gender %><br />
<%= f.number_field :gender %>
</div>
<div class="actions">
<%= f.submit :class => "btn btn-primary" %>
<%= link_to "Voltar", users_path, :class => "btn" %>
</div>
<% end %>

12. Resources
Formulário de novo usuário
@jlucasps

13. Resources
Implementar action create
@jlucasps
def create
@user = User.new(params[:user])
if @user.save
flash[:notice] = "Usuário criado"
redirect_to user_path(@user)
else
render :action => :new
end
end

14. Resources
Implementar a action e view show
@jlucasps
<p id="notice"><%= notice %></p>
<p><b>Nome:</b><%= @user.name %></p>
<p><b>email:</b><%= @user.email %></p>
<p><b>Idade:</b><%= @user.age %></p>
<p><b>Sexo:</b><%= @user.gender %></p>
<%= link_to 'Edit', edit_user_path(@user), :class => "btn"
%> |
<%= link_to 'Back', users_path, :class => "btn" %>
def show
@user = User.find(params[:id])
end

15. Resources
Tela de exibição de usuários
@jlucasps

16. Resources
Completar tela de listagem
@jlucasps
<% if @users.any? %>
<table class="table table-bordered">
<% @users.each do |user| %>
<tr>
<td>
<%= "#{user.name} (#{user.email}), #{user.age} anos" %>
<%= link_to "<i class='icon-edit'></i>".html_safe, edit_user_path(user), :class =>
"btn btn-mini" %>
<%= link_to "<i class='icon-trash'></i>".html_safe, user, :method => :delete, :
class => "btn btn-mini" %>
</td>
</tr>
<% end %>
</table>
<% else %>
<div class="alert">
Nenhum usuário cadastrado
</div>
<% end %>
<%= link_to "Novo usuário", new_user_path, :class => "btn btn-success" %>

17. Resources
@jlucasps

18. Resources
Implementar actions de edit e update
@jlucasps
<h4>Editar usuário</h4>
<%= render :partial => 'form', :locals => {:user => @user}
%>
/app/views/users/edit.html.erb
def edit
@user = User.find(params[:id])
end
def update
@user = User.find(params[:id])
if @user.update_attributes(params[:user])
flash[:notice] = "Usuario modificado"
redirect_to user_path(@user)
else
render :action => :edit
end
end

19. Resources
Action destroy
@jlucasps
def destroy
@user = User.find(params[:id])
flash[:notice] = (@user.destroy ? "Usuario deletado" : "Falha
na remocao")
redirect_to users_path
end

20. Resources
Listagem final de usuários
@jlucasps

21. Desenvolvimento
Web com Ruby on
Rails
João Lucas Pereira de Santana
gtalk | linkedin | twitter: jlucasps
Obrigado!