As Bill Dueber has on his blog, you can call rvm in the shebang to select a Ruby version like...
Note: These instructions are for a quick per-project setup and may require you to change code. If you generally...
You can detect city and country from an IP address by using the GeoLite database. This is a flat file...
When you download or upgrade RVM it has a hardcoded notion which patch level it considers to be "1.9.3".
tl;dr: Ruby's Bundler environment is passed on to system calls, which may not be what you may want...
When using the json gem, you might run into this error when using JSON.parse: >> json = 'foo'.to_json >> JSON.parse(json...
All Rubyists should be familiar with the common definitions for include and extend. You include a module to add instance...
yaml4r is a juxtaposition of yaml documents and their Ruby couterpart. Thus, it does a great job as YAML-doc...
Ever wondered about the difference between def and define_method? Turns out there are three implicit contexts in Ruby. def...
The way Rational#to_s works on Ruby has changed from Ruby 1.9 on. Here is how to get the...
In Ruby, the meaning of protected and private is different from other languages like Java. (They don't hide methods...
Access the Method object Dead simple: Get the method object and ask for its owner: "foo".method(:upcase) # => #
For example if you use rvm and get this message: ERROR: Loading command: install (LoadError) no such file to load...
Consider this class: class Foo private def test puts "Hello" end end While you can say create a block to...
Ruby 1.8 (supplied by Rails' ActiveSupport) >> BigDecimal.new("0.1").floor.class => BigDecimal Ruby 1.9 (supplied by Ruby 1.9 itself) >> BigDecimal.new("0.1").floor.class...
When you use heredoc, string interpolation is enabled by default: x = "Universe" <<-MESSAGE Hello #{x} MESSAGE # => "Hello Universe"
Given you use Capistrano together with bundler to automatically install your gems when deploying. I recently had the problem that...
In Ruby 1.9, instance_eval calls the block the with receiver as the first argument: In Ruby 1.8, receiver.instance_eval...
MongoMapper is a MongoDB adapter for Ruby. We've forked it so it works for Rails 2.3.x applications running...
Ruby 1.9 changed the default behavior of Module.const_defined? from what it was in Ruby 1.8 -- this can be especially...
This error can happen in Ruby 1.9. To fix it, add the following line to the top of your .js.erb...
Rails 2.3.16+ on Ruby 1.9 causes warnings like this: .../gems/activesupport-2.3.17/lib/active_support/core_ext/string/output_safety.rb:22: warning: regexp match /.../n against to UTF-8 string...
So you have a method returning a regular expression but one case that should not yield a matching Regexp object...
You either have an old version of Mocha and an edge version of Rails 3.2, or you have a new...