Ruby for Rails phần 6 pdf

... huge roles in Ruby and Rails. Some of the founda- tional Ruby libraries upon which Rails is built use hashes to pass data around; in particular, the Ruby CGI library makes your CGI form data available ... of the irb session format for the code examples, and you can often try the examples with small variations to get a feel for how Ruby behaves. 9.1 Ruby s literal constructors...

Ngày tải lên: 06/08/2014, 09:20

... use an absolute path for a file. This may happen if you create a class or module with a name that’s similar to the name of a Ruby built-in class or module. For example, Ruby comes with a String ... exceptions Way back in chapter 1, we looked at how to test code for syntax errors: $ ruby -cw filename.rb Passing the -cw test means Ruby can run your program. But it doesn’t mea...

Ngày tải lên: 06/08/2014, 09:20

... arity. Ruby offers several variations on the callable method-or-function theme. We’ll look next at another form of anonymous function: the lambda. B Part 4 Rails through Ruby, Ruby through Rails The ... if you apply the principles for orienting yourself in a Ruby program that we’ve already covered. In this code 364 CHAPTER 13 Ruby dynamics class E < D end you’re informed...

Ngày tải lên: 06/08/2014, 09:20

... 85 The irb-based Rails application console 89 3.4 Summary 90 Ruby for Rails RUBY TECHNIQUES FOR RAILS DEVELOPERS DAVID A. BLACK MANNING Greenwich (74° w. long.) vii PART ITHE RUBY/ RAILS LANDSCAPE ... ■ How Ruby works 3 2 ■ How Rails works 33 3 ■ Ruby- informed Rails development 67 PART II RUBY BUILDING BLOCKS 93 4 ■ Objects and variables 95 5 ■ Organizing obj...

Ngày tải lên: 06/08/2014, 09:20

... in Ruby and shipped with Ruby) , lightTPD CGI Library CGI data processing routines Parses incoming form data Part of the Ruby standard library ERb "Embedded Ruby& quot; Templating system for ... extension (require it) ruby -rprofile version Show Ruby version information ruby version A Rails application walk-through 45 Initializing the databases To create the database fo...

Ngày tải lên: 06/08/2014, 09:20

... CHAPTER 3 Ruby- informed Rails development because of Ruby (Ruby doesn’t care), but because leaving the parentheses off is a standard Rails convention. The common idioms you use in Rails aren’t ... sent to I/O sockets, and so forth. It’s not uncommon for programs to define a method called send that conflicts with Ruby s built- in send method. Therefore, Ruby gives you an...

Ngày tải lên: 06/08/2014, 09:20

... do and looks better. Ruby gives you some syntactic sugar for calling setter methods. Instead of this ticket.price= (65 .00) you’re allowed to do this: ticket.price = 65 .00 Format price to two decimal ... listing 6. 5 into cargohold.rb , and try it. require "stacklike" class Suitcase end Listing 6. 5 Using the Stacklike module a second time, for a different clas...

Ngày tải lên: 06/08/2014, 09:20

... "b", "y"] Another common use case for split is performing a conversion from a flat, text- based configuration file to a Ruby data format—array, hash, or something fancier What are ... of Ruby built-in methods take regular expressions as arguments and perform selection or modification on one or more string objects. Regular expressions are used, for example, to sca...

Ngày tải lên: 06/08/2014, 09:20

... provisions for that person to log in. 16. 4.1 The login and signup partial templates The main welcome view template, shown in listing 16. 9, performs a rendering of partials for login and signup forms. ... cosmetic. The consistent “Rubyness” of a Rails application makes for a consistent development experience: It’s easier to think in Ruby the whole time than it is to switch back an...

Ngày tải lên: 06/08/2014, 09:20

... the process is to install RubyGems itself. The RubyGems project is hosted by RubyForge. The homepage for RubyGems is http://rubyforge.org/projects/rubygems. Look for the Latest File Releases ... extension 360 before_create 78, 83, 89 cascading of Class#inherited 363 Class#inherited 363 – 365 examples of events 359 included (class method of Module) 462 method_missing 360 – 361 Mod...

Ngày tải lên: 06/08/2014, 09:20