Ruby

Deploying Network application Services is a hassle, installing programs, upgrading database schemas, switching versions, and restarting services. The more steps, the more human involvement, the more prone to problems. Capistrano is Ruby on Rails to

First, Introduction Since the advent of Ruby on Rails last year, interest in the Ruby programming language seems to have grown steadily. Rails has helped people see what Ruby is: A very decent, easy to learn and fun-filled language, even for the

Ruby Arrays (arrays) and hash lists (hashes) are indexed collections (indexed collections). Both store the collection of objects, accessed by key. The key of the array is an integer. The hash list supports any object as its key. Arrays and hashes

A traditional program has a separate thread that executes the statement or instruction sequence that contains the program until the program terminates. A multithreaded program has multiple threads executing. Each thread is executed sequentially,

Go to Script/consle after upgrading Ruby and Rails: Copy Code code as follows: /usr/local/lib/ruby/1.8/irb/completion.rb:10:in ' require ': No such file to load-ReadLine (Loaderror) From/usr/local/lib/ruby/1.8/irb/completion.rb:10

The time class is used in Ruby to represent dates and times. It is based on the system date and time provided by the OS. The class may not represent a date before or after 1970 or 2038 years. This tutorial will familiarize you with all the

A hash is a collection of key-value pairs such as "employee" => "salary". The index of a hash is done by any key of any object type, not an integer index, and the other is similar to an array. The order in which the hash is traversed by a key or

Describes a class-like construct: a module. When designing a program, we divide the large components into small chunks, and you can mix and match the behavior of the objects. Similar to classes, modules also bundle methods with constants. What is

Ruby's Literal builder Most of Ruby's built-in classes can be instantiated using new: str = string.newarr = array.newSome classes cannot be instantiated using new, such as the Integer class. Some built-in classes can use a literal constructor, or

Use the String#strip method to remove all spaces The code is as follows Copy Code "Hello". Strip #=> "Hello""Tgoodbyern". Strip #=> "Goodbye" In addition, Lstrip and Rstrip remove the spaces at the left and

You are a veteran. NET programmer, and has built many Web applications with asp.net. Countless sleepless nights, in order to allow the event-driven model in the ASP.net control lifecycle to execute in the way you want, you painstaking and delve

The internet is all about rake:db:sessions:create. But for the RAILS4 version, it doesn't work.Here is my own operation for the RAILS4 version.RAILS4 Session data Table creation: Please refer to this document: Http://www.cnblogs.com/heimirror/p/35369

1.RubyInstaller Download window version installation at Rubyinstaller website, address: http://rubyinstaller.org/downloads/ Execute setup, tick add Ruby executables to your PATH, install finish test on cmd ruby-v view Note that there are no spaces

The reason for the error is that build tools is required when installing XXXXX, but not in the system. The resolution is also given in the error message:1. Go to http://rubyinstaller.org/downloads/to download dev Kit–devkit-tdm-32-4.5.1-20101214-1400

Instructions on how to use the XML data processing database REXML in Ruby, rubyrexml Use REXML as a treeThe purpose of REXML is to be enough. To the maximum extent, it can complete tasks well. In fact, REXML supports two different styles of XML

Example of using Builder mode in Ruby Design Mode Programming, rubybuilder Let's first review the basic concepts of the design model:DefinitionSeparates the construction of a complex object from its representation, so that different representations

ActiveRecord programming guide in Ruby on Rails, rubyonrails Avoid modifying the default ActiveRecord (Table Name, primary key, and so on) unless you have a very good reason (such as a database not under your control ).Put the macro-style method

Explain how to use mailer in Ruby on Rails, railsmailer Name mails SomethingMailer. Without the Mailer root, you cannot immediately see which is a Mailer and which view is related to it.Provides HTML and plain text view templates. An error occurred

Object array sorting in Ruby and Ruby object array sorting Sorting of Ruby object arrays The author has just come into contact with Ruby, because he previously thought that the script language syntax is not standardized and he is somewhat biased

A simple tutorial on JSON Processing Using Ruby, and a json tutorial on ruby Processing Environment Configuration Before using Ruby to encode or decode JSON data, we need to install the Ruby JSON module. Before installing this module, you must first