Ruby

Tutorial Requirements This tutorial requires the following technologies and resources: A database server NetBeans IDE 6.0 that supports Ruby To create a sample database Note: This tutorial uses the MySQL database server. For information about

Ruby Installation-LinuxThe following is a list of steps to install Ruby on a Linux machine.Note: Before installing, make sure you have root permissions.SOURCE InstallationDownload the latest version of the Ruby zip file. Please click here to

The range is everywhere: January to December, 0-9 days, 50 to 67 lines, and so forth. Ruby supports scope and allows us to use a range of ways: As a sequence range As a condition range As an interval range As a sequence range:

Ruby determines whether a number is primePrime numbers are also called primes. A natural number greater than 1, if it is not divisible by other natural numbers except for 1 and itself, (except for 0), otherwise known as composite numbers. According

Ruby Code Copy Code code as follows: If @user. Update_attributes (:p assword => params[:user][:p assword]) Flash[:notice] = ' Password modification complete ' Redirect_to:action => ' index ' Else Redirect_to:action => '

Ruby has a lot of classic drive architectures, such as enumerators and generators, and so on. This brief introduction to the concept of the generator. The generator is a function-generated object, or a method of generating an object. The continuum

In the process of using ruby/rails, it is found that sometimes performance is unsatisfactory, such as the generation of a 3-layer tree with 600 items of the directory to spend 20ms, in order to improve performance in the learning to write Ruby

At last year's Yow Melbourne developer Conference, I attended some workshops. These workshops are the responsibility of the @coreyhaines and @rains, so TDD (test-driven development) is the main content of the discussion. It's usually not a problem,

Note one:The code contains variables, classes, and methods, collectively referred to as language constructs (language construct). # TEST.RB class greeting def initialize (text) @text = text end def welcome @text End end my_obj =

A regular expression is a special sequence of characters that matches or finds a collection of other strings or strings by using a pattern that has a specialized syntax.Grammar A regular expression is literally a pattern between a slash or between

Sometimes it is convenient to be able to store any Ruby object directly in an attribute, in the same way that an active record supports serialization, transforms a Ruby object into a ymal string, and stores the string in the database field

Arrays in ruby are created by square brackets. The initial values can be placed in square brackets and separated by commas. array elements can be of different types and support addition and multiplication. Ary = [1, 2, "3"]Ary * 2 Returns [1, 2, "

View View is divided into builder mode and rhtml mode. The following is an example of the builder mode. XML. Div (: class => "productlist") DoXML. timestamp (time. Now)@ Products. Each do | product |XML. Product doXML. productname (product.

Parameterization is a commonly used technology in automated testing. It is painful to create a testing framework that does not support parameterization. Qtp already exists, But ruby-like watir and selenium are not supported because these frameworks

Create a new class and use the Dom. Factory method. Obviously, it is a factory method that produces various classes in batch. VaR myfirstclass = Dom. factory ({message: "Hello World", sayhello: function () {alert (this. message) ;}}); var OBJ =

There is no constructor like C ++ or Ruby in Ruby, but we can still create multiple constructor similar to this: Class coloredrectangle def initialize (R, G, B, S1, S2) @ r, @ g, @ B, @ S1, @ S2 = R, G, B, S1, s2 end def coloredrectangle. white_

Development Environment OS: Windows XP RUBY: ruby1.8.7 Rails: rails2.3.5 MySQL: mysql5.0.9 IDE: rubymine2.0.1   Preparations: Install the following gem package Gem install ruport Gem install ruport-util Gem install acts_as_reportable   In this

HTTPwatch official: http://www.httpwatch.com/rubywatir/ Ruby on httpwatch example: http://www.httpwatch.com/rubywatir/site_spider.zip (this example may be updated on the official website) After this example is obtained, some Chinese comments are

Ruby On Rails and rubyonrails Development Environment: Ubuntu 16.4 LTS Installing ruby through rvm 1. RVM Installation $ Gpg -- keyserver hkp: // keys.gnupg.net -- recv-keys 409b6b1796c275462a1703111084bb82d39dc0e3 $ Curl-sSL https://get.rvm.io |

Installation steps.[Root @ DS-VM-Node190/tmp/] # mkdir-p/tmp/ruby[Root @ DS-VM-Node190/tmp] # DOWNLOAD_URL = "http://mirrors.dwhd.org/Ruby/ruby "&&\DOWNLOAD_URL = "$ (curl-Lks" $ {DOWNLOAD_URL} "| awk-PF '" ''{if ($2 ~ /^ [0-9] + \. [0-9] +/) a = $2}