Beginning Rails 3 (Expert's Voice in Web Development)

By Cloves Carneiro Jr., Rida Al Barazi

Beginning Rails 3 is the sensible place to begin for somebody eager to tips on how to construct dynamic net functions utilizing the Rails framework for Ruby. you are going to learn the way the entire elements of Rails healthy jointly and the way you could leverage them to create subtle net functions with much less code and extra joy.

This publication is especially well matched to these with very little adventure with net software improvement, or who've a few event yet are new to Rails. Beginning Rails 3 assumes simple familiarity with net phrases and applied sciences, yet does not require you to be knowledgeable. instead of delving into the arcane information of Rails, the point of interest is at the features of the framework that might develop into your choose, shovel, and awl. half historical past lesson, half creation to object-oriented programming, and half dissertation on open resource software program, this identify does not simply clarify how one can do whatever in Rails, it explains why.

  • Learn to create Rails net functions from scratch
  • Includes a gradual creation to the Ruby programming language
  • Completely up to date to incorporate the positive aspects of Rails three

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Authenticate process returns nil, you recognize the supplied login and password are invalid, and also you go back to the login web page with an alert message utilizing flash. now. RESTfully talking, the login web page is the place you input the recent consultation details, so it’s primarily the recent motion. „ be aware flash. now differs from the usual flash name via atmosphere a flash message that's purely to be had to the present motion. should you keep in mind, usual flash makes messages on hand after a redirect. yet wait: you don’t have a brand new motion but. Don’t you want to outline it first? in actual fact, you don’t have to initialize whatever there—all you would like is its template. through having the template, Rails immediately renders that template whilst it doesn’t locate the motion definition. Let’s create the recent template, as proven in directory 7-19. directory 7-19. new consultation Template in app/views/sessions/new. html. erb: http://gist. github. com/338925


<%= form_tag session_path do percent>

<%= label_tag :email %>
<%= text_field_tag :email percent>
<%= label_tag :password %>
<%= password_field_tag :password percent>
<%= submit_tag 'Login' percent>

<% finish percent> observe that you simply use form_tag rather than form_for, that you used past with lively checklist gadgets; that’s simply because consultation isn’t an energetic checklist item. you furthermore mght undergo session_path simply because it’s a source, no longer assets, as defined past. back, since you aren’t facing an energetic checklist item, you utilize label_tag, text_field_tag, and password_field_tag helpers. Logging Out a consumer The person is logged in while a consultation is created, so for you to sign off the consumer, you must transparent that consultation. You achieve this within the break motion. The break motion is reasonably user-friendly. You transparent the 173 CHAPTER 7 „ complicated motion PACK consultation through the use of the reset_session strategy that incorporates Rails, which does precisely because it says: it resets the consultation by way of clearing the entire values in it. once you transparent the consultation, you redirect again to the login_path, that's your login monitor. otherwise to do that is to particularly transparent the user_id key from the consultation hash, yet it’s more secure for the logout particularly to transparent the entire consultation values. directory 7-20 indicates how the classes controller takes care of you upload the smash technique. directory 7-20. up to date classes Controller in app/controllers/sessions_controller. rb: http://gist. github. com/338944 type SessionsController < ApplicationController def create if person = person. authenticate(params[:email], params[:password]) session[:user_id] = consumer. identification redirect_to root_path, :notice => "Logged in effectively" else flash. now[:alert] = "Invalid login/password blend" render :action => 'new' finish finish def smash reset_session redirect_to root_path, :notice => "You effectively logged out" finish finish move forward and check out it. Create a consumer by way of going to http://localhost:3000/users/new. Then, log in through vacationing the login direction at http://localhost:3000/login; see determine 7-4.

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