Ruby

intends to learn a scripting language, but do not know which to choose, the Internet to find information, finally difficult to choose in Ruby and Python, so list other people's evaluation, choice, opinion, etc. for themselves and others reference;In

When Ruby is used in netbeans, all Chinese output is garbled. The solution is as follows:Find the etc directory in the installation directory of netbeans, open the directory, and then open the file in netbeansAdd an option to the netbeans. conf

I didn't want to write or install Ruby, but some people in several puppet groups are confused about Ruby installation. So here I will briefly introduce how to install Ruby. PS: Now gitlab, Capistrano, puppet, and other software use Ruby. The latest

There are three machines and the operating system is centos 6.3 64-bit: 172.16.9.100, install nginx server; the other two 172.16.9.101 and 172.16.9.102 install unicorn as the ROR application server. Ensure that Ruby and rails have been configured on

In Ruby language, the Return Statement in the ruby functions are interesting, let's wait e them as below: Def concatenate (name_one = nil, name_two = "") return name_one + name_twoendname = concatenate "Wuhan", "Hubei" puts nameputs concatenate ("

How to quickly learn Ruby? The fastest way to learn a language. Variables, constants, variable types, operators, Logical statements such as if, else, switch, for, foreach, do while, break, and so on. What is the language to learn similar to these

  I. Comparison statements Most of them are the same as other languages. Note ,   Condition Statement The following forms If If... else... end If... elsif... else... end Unless (if not) Case... when x=1if x==1 puts 1elsif x==2 puts

Ruby objects are strictly encapsulated: they can only access their internal states through defined methods. The member variables used by the method cannot be directly accessed outside the object. However, they can be directly accessed through getter,

 Construct string literal Method 1:A string enclosed by single or double quotation marks, such as "hello ".Method 2:% Q is used with the delimiter, and % Q represents single quotes.STR = % Q! He/lo!Method 3:% Q is used with the delimiter, and % Q

Module Similar modules also have class method and instance method.The instance object cannot be generated if the module does not have a new one.The class method is called a module method in the module and can be called directly. Module Foo def self.

Differences between the access control operators public, private, and protected in Ruby, and rubyprivate Focus on private and protectedPublic The default value is public, which can be accessed globally.Private C ++, "private" indicates "private to

In the Java language, the launch mechanism is provided. Through the launch mechanism, this object can be constructed using strings to obtain all methods of the object (including private methods) and call private methods, you can change the value of

After installing the Rails framework, you also get a new command line tool: rails. This tool can be used to construct each new Rails application. Why do we need such a tool-I mean, why don't we just copy the most handy editor and write each line of

1. Get Data Obtain the first and last recordsCopy codeThe Code is as follows:Model. firstModel. first (options)Model. find (: first, options)Model. lastModel. last (options)Model. find (: last, options) Retrieve records by id Copy codeThe Code is as

Upgrade mac OS Mavericks to the latest version. Json loading error:Copy codeThe Code is as follows:Gem install json-v '1. 8.1' Building native extensions. This cocould take a while...ERROR: Error installing json:ERROR: Failed to build gem native

This article uses Nginx, Rails, Mysql, and Redis as an example. It is similar to other web servers, languages, databases, and cache services.The following are three layers to facilitate subsequent reference: 1. Client Cache A client often accesses

First, let's take a look at the NewRelic report. Average response time of the last 24 h Pages with high traffic) Several actions of traffic volume: TopicsController # show UsersController # show (miserable, mainly because GitHub API requests are

Installation steps: 0 × 00-clone the Metasploit project from github to the local device; 0 × 01-install and configure postgresql; 0 × 02-install a specific version of ruby and resolve dependencies; 0 × 00 clone Metasploit project from github to

Implementation Code: Copy codeThe Code is as follows:Class DesRequire 'openssl'Require 'base64'ALG = 'des-EDE3-CBC'KEY = "mZ4Wjs6L"DES_KEY = "nZ4wJs6L"# EncryptionDef encode (str)Des = OpenSSL: Cipher. new (ALG)Des. pkcs5_keyivgen (KEY, DES_KEY)Des.

Today I will explain how to upload images in rails, which is the most common way to upload images. The rails version is 2.3.5. Create a write_pic modelThe content is as follows:Copy codeThe Code is as follows:Class WritePicRequire "RMagick"Require