Ruby

[Email protected] first]# rails s/usr/local/rvm/gems/ruby-2.0.0-p481/gems/execjs-2.2.1/lib/execjs/runtimes.rb:51:in ' AutoDetect ': Could not find a JavaScript Runtime. See Https://github.com/sstephenson/execjs for a list of available runtimes.

The source connection for the most recent use of Ruby-china is not Using Gem Update to encounter this problem, It turns out that Ruby does not contain an SSL certificate, so the link to HTTPS is rejected by the server. The workaround is

Is bcrypt did not uninstall clean,Gem Install BundlerThen Devkit Click Select to extract to the software folder (instead of the right-click Decompression instead of clicking and selecting the directory), then execute the following commandThen open

Is there a method in Ruby that takes an array, and counts all unique elements and their occurrences and passes them back a S a hash?For example [' A ',' A ',' A ',' A ',' B ',' B ',' C '].Method> {' A ' = 4, ' B ' = 2, ' C ' = 1}Something like that.

The data for Ruby operations is mainly in parts: objects, classes, variables, constants.ObjectThe basic unit of data represented in Ruby is called an object, and everything in Ruby is an object.Common objects: Numeric Objects2, 3.14, 5 and

Installation will not say, the official website has, but today released ruby2.3, so updateEnter the. Rbenv directory, perform a git pull update, but update rbenv, execute rbenv install-l and do not have the latest 2.3.0 release version.Then I looked

May be the cause of the national firewall package, the installation of Railsinstaller after the execution always error, Bundle InstallDL is deprecated, fiddleFetching gem metadata from https://rubygems.org/.....Resolving dependencies ...

Sky = nilsky. nil? #=> TrueAll other objects are object. nil? All are false. If a database attribute is null, the attribute is. nil? #=> TrueEmpty? Used for string, array, and hash# Array []. Empty? #=> True # string "". Empty? #=> TrueBut "". Empty?

Operator meaning = Whether the test value is equal ==== Used to compare the target of a case statement and the items of each when clause General comparison operators. -1, 0. 1 =,> Less than, less than or equal to, greater than or equal to, and

Both alias and alias_method in Ruby can be renamed. The differences between them are as follows:   1. Alias is a keyword of Ruby, so it is alias: newname: oldname. Alias_method is a method of the module class. Therefore, alias_method: newname,

Ruby variables include local variables, global variables, instance variables, class variables, and constants. 1. Local Variables Local variables start with a lowercase letter or underline Local variables have local scope restrictions (such as within

There are two forms of Ruby case expressions: The first form is similar to a set of continuous if statements: it allows you to list a set of conditions and execute the first statement corresponding to the true condition expression. In the second

For instructions on WebDriver in Ruby, see rubywebdriver. Explicit wait:  wait = Selenium::WebDriver::Wait.new(:timeout => 3)wait.until { driver.find_element(:id => "cheese").displayed? }   Implicit wait:  driver = Selenium::WebDriver.for

Some brief translations of gem (You are welcome to raise questions for discussion ). This article is mainly used in two aspects. 1. I hope to provide some help to rails colleagues. The translation level is limited. I will post Chinese and English

Explain the usage of loop statements in Ruby, and explain the usage of ruby statements. The loop in Ruby is used to execute the same code block several times. This section describes all loop statements supported by Ruby in detail.Ruby while

Rails jumps to the uniform error page when an error occurs. A website in iterative development is prone to bugs, and the customer experience is poor when a bug occurs. To solve this problem, you can trigger the jump to the unified prompt page when a

How to start a website using iisweb. vbs start, iisweb. vbsstart Application to: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1 IIS automatically starts a website when it is created, unless the Administrator explicitly

Sidekiq in RailsIntroduction Sidekiq is a multi-threaded background task processing system. Before it came out, a Resque product (made on Github) exists, because Resque is a multi-process model, therefore, when the number of tasks increases, the

Closure refers to the free code that is not bound to any object. The code in the Closure is irrelevant to any object and global variables and is only related to the context of the code execution. Today, let's take a brief look at the closure

What is the difference between new, collection, and member in Rails Routes? railsroutes By default, there are seven RESTful routing verbs (index, show, create, new, edit, update, and destroy ). Sometimes we need to customize the route, then we need