Download E-books Rails AntiPatterns: Best Practice Ruby on Rails Refactoring (Addison-Wesley Professional Ruby) PDF

By Chad Pytel, Tammer Saleh

The whole advisor to fending off and solving universal Rails three Code and layout difficulties

As builders around the globe have followed the strong Ruby on Rails net framework, many have fallen sufferer to universal error that decrease code caliber, functionality, reliability, balance, scalability, and maintainability. Rails™ AntiPatterns identifies those frequent Rails code and layout difficulties, explains why they’re undesirable and why they happen—and exhibits precisely what to do in its place.

The publication is prepared into concise, modular chapters—each outlines a unmarried universal AntiPattern and gives distinct, cookbook-style code strategies that have been formerly tricky or very unlikely to discover. prime Rails builders Chad Pytel and Tammer Saleh additionally supply particular information for refactoring present undesirable code or layout to mirror sound object-oriented rules and confirmed Rails most sensible practices. With their support, builders, architects, and testers can dramatically increase new and present functions, stay away from destiny difficulties, and identify more desirable Rails coding criteria all through their businesses.

 

This e-book may also help you recognize, keep away from, and resolve difficulties with

  •  Model layer code, from common object-oriented programming violations to complicated SQL and over the top redundancy
  • Domain modeling, together with schema and database matters similar to normalization and serialization
  • View layer instruments and conventions
  • Controller-layer code, together with RESTful code
  • Service-related APIs, together with timeouts, exceptions, backgrounding, and reaction codes
  • Third-party code, together with plug-ins and gems
  • Testing, from try suites to test-driven improvement processes
  • Scaling and deployment
  • Database concerns, together with migrations and validations
  • System layout for “graceful degradation” within the genuine world

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Additionally, you are making absolute to assign the hot person to the account ahead of saving either one of them: # app/controllers/account_controller. rb type AccountsController < ApplicationController def new @account = Account. new @user = consumer. new finish naomik ^_^ AntiPattern: fats Controller one hundred forty five def create @account = Account. new(params[:account]) @user = consumer. new(params[:user]) @user. account = @account if @account. retailer and @user. store flash[:notice] = 'Account used to be effectively created. ' redirect_to(@account) else render :action => "new" finish finish finish the shape inside of new. html. erb lower than needs to care for sending units of parameters to the controller—one for the account and one for the consumer. you utilize form_for’s cousin, the fields_for helper, to complete this. # app/views/accounts/new. html. erb

New account

<%= form_for(@account) do |f| percent> <%= f. error_messages percent>

<%= f. label :subdomain %>
<%= f. text_field :subdomain percent>

<%= fields_for(@user) do |u| percent> <%= u. error_messages percent>

<%= u. label :email %>
<%= u. text_field :email percent>

<%= u. label :password %>
<%= u. text_field :password percent>

<% finish percent> naomik ^_^ 146 bankruptcy four. Controllers

<%= f. put up "Create" percent>

<% finish percent> A sophisticated computer virus The implementation within the previous part features a a little bit sophisticated trojan horse. The #create motion first attempts to avoid wasting the account list. If that succeeds, it then attempts to avoid wasting the consumer list. If the customer sends in legitimate account parameters and invalid consumer parameters, the method might be left with a stored account list with no an linked user—an bad state of affairs. evidently, reordering the calls to #save won’t aid the following, as that may in basic terms permit the buyer to create an orphaned person list as a substitute. the subsequent instance exhibits a transformed sensible try to demonstrate this trojan horse: # test/functionals/account_controller_test. rb classification AccountsControllerTest < ActionController::TestCase # ... context "on submit to #create with reliable values" do setup do publish :create, :account => {:subdomain => "foo"}, :user => {:email => "foo@bar. com", :password => "issekrit? "} finish may still set_the_flash. to(/created/i) should_change "User. count", :by => 1 should_change "Account. count", :by => 1 may still "assign the person to the account" do assert_equal assigns(:account). identification, assigns(:user). account_id finish finish context "on submit to #create with undesirable account values" do setup do publish :create, :account => { }, :user => {:email => "foo@bar. com", :password => "issekrit? "} finish naomik ^_^ AntiPattern: fats Controller 147 should_not_change "User. count number" should_not_change "Account. count number" may still assign_to(:account) may still assign_to(:user) may still render_template(:new) finish context "on put up to #create with undesirable consumer values" do setup do publish :create, :account => { :subdomain => "foo" }, :user => { } finish should_not_change "User. count number" should_not_change "Account. count number" may still assign_to(:account) may still assign_to(:user) should still render_template(:new) finish # ... finish In Rails 2. 2 and Rails 2. three, whilst facing transactions in an program, it’s very important to show off transactional furnishings.

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