Desenvolvimento Web com Ruby on

Rails

João Lucas Pereira de Santanagtalk | linkedin | twitter: jlucasps

ResourcesResources 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

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resources :messages

namespace "admin" do resources :posts, :comments # app/controllers/admin/postsend resources :magazines do resources :adsend

Resources

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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

Resources

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messages GET /messages(.:format) messages#index POST /messages(.:format) messages#createnew_message GET /messages/new(.:format) messages#newedit_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

Resources

Alterar tela index.html.erb para conter link para listagem de usuários

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<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 %>

Resources

Criar tela de listagem de usuários em /app/views/users/index.html.erb

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<% 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" %>

Resources

Criar controller de usuários em /app/controllers/users_controller.rb

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class UsersController < ApplicationController def index @users = User.all end end

Resources

Tela de listagem de usuários

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Criar a action new para exibir formulárioResources

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class UsersController < ApplicationController def index @users = User.all end def new @user = User.new endend

<h4>Novo usuário</h4> <%= render :partial => 'form', :locals => {:user => @user} %>

Resources

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/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 %>

ResourcesPartial com formulário em /app/views/users/_form.html.erb

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<%= 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 %>

Resources

Formulário de novo usuário

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Resources

Implementar action create

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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

ResourcesImplementar a action e view show

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<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

Resources

Tela de exibição de usuários

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Resources

Completar tela de listagem

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<% 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" %>

Resources

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Resources

Implementar actions de edit e update

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<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 endend

Resources

Action destroy

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

Resources

Listagem final de usuários

@jlucasps

Desenvolvimento Web com Ruby on

Rails

João Lucas Pereira de Santanagtalk | linkedin | twitter: jlucasps

Obrigado!