What exactly is a gem native extension?
A gem native extension might link to a separate library that needs to be pre-installed, and RMagick is an example of that. However, the term really just means "includes some code that needs to be compiled for your machine". The code is compiled and linked so that the resulting executable file can be required by Ruby on the machine. The usual reasons for writing a Ruby C or C++ extension are: Speed
Using mruby, ngx_mruby and redis - Applying on current production server
I am very afraid of making some modifications on the server. Because the server is working fine with the current settings. I will to explain: The server is an Amazon EC2 instance. In this instance I have: ruby -v: ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux] rails -v: Rails 4.2.3 nginx -v: nginx/1.8.0 passenger -v: Phusion Passenger version 5.0.10 I have 1 Load Balancer, which has a li
Capistrano deployment problems
When I type cap production deploy I get Capfile locked at 3.1.0, but 3.2.0 is loaded When I uninstall capistrano 3.2.0 I get Could not find capistrano-3.2.0 in any of the sources Run `bundle install` to install missing gems. Me gemfile has gem 'capistrano', '~> 3.1' gem 'capistrano-rails', '~> 1.1' And Capfile require 'capistrano/setup' require 'capistrano/deploy' require 'capistrano/bundler' requ
How to handle 404 not found errors in Nokogiri
I am using Nokogiri to scrape web pages. Few urls need to be guessed and returns 404 not found error when they don't exist. Is there a way to capture this exception? http://yoursite/page/38475 #=> page number 38475 doesn't exist I tried the following which didn't work. url = "http://yoursite/page/38475" doc = Nokogiri::HTML(open(url)) do begin rescue Exception => e puts "Try again later" end end
link_to in helper with block
The return value of the block becomes its content. Only the last line is being returned. You must concatenate the two strings together with + to produce a single return value: link_to("#", class: "add_fields btn btn-success") do name + content_tag(:i, "", class: "icon-plus icon-white") end You'll need to use html_safe to prevent the content of your tag from automatically being HTML encoded: link_t
When to use RSpec let()?
I tend to use before blocks to set instance variables. I then use those variables across my examples. I recently came upon let(). According to RSpec docs, it is used to ... to define a memoized helper method. The value will be cached across multiple calls in the same example but not across examples. How is this different from using instance variables in before blocks? And also when should you use
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