ruby-1.9.2

I've decided to get rid of rvm, and I'm having trouble compiling a gem with my new version of ruby 1.9.2. The gem requires 1.9.2, I have it, yet says it can't install without, so the error messages makes no sense. How can I explicitly tell the gem to compile with said version of ruby? Gem::InstallError: linecache19 requires Ruby version >= 1.9.2. An error occured while installing linecache19 (0.5.12), and Bundler cannot continue. Make sure that `gem install linecache19 -v '0.5.12'` succeeds before bundling. apps2 ~/projects/sms/apps2/apps2_admin $ ruby -v ruby 1.9.2p180 (2011-02-18 revision

I have a Model called Category and other Model Product. They have has_many and belongs_to relation. But code in my view <p><%= f.collection_select(:product, :category_id, Category.all, :id, :name)%> is giving me undefined method `merge' for :name:Symbol Any clue what is wrong with it? Chances are you have something like this: <%= form_for @product do |f| %> Because f is already tied to product , you don't need to include it as your first argument, so it should just be: <%= f.collection_select :category_id, Category.all, :id, :name %> Or, you could not use f. : <%= collection_select :product,

I am having a problem with installing linecache19(dependency of ruby-debug19) for ruby 1.9.2 Here is my term output $ rvm use 1.9.2 Using /home/bogdan/.rvm/gems/ruby-1.9.2-p180 $ ruby -v ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux] $ rvm exec gem install linecache19 --backtrace gem install linecache19 --backtrace rvm 1.6.20 by Wayne E. Seguin (wayneeseguin@gmail.com) [https://rvm.beginrescueend.com/] ERROR: Error installing linecache19: linecache19 requires Ruby version >= 1.9.2. ERROR: Error installing linecache19: linecache19 requires Ruby version >= 1.9.2. Building native

Ubuntu 11. I do the following: $ rvm --default use 1.9.2 and I get: Using /home/md/.rvm/gems/ruby-1.9.2-p180 so that is good. but when I now open a new terminal window I still get: $ ruby -v ruby 1.8.7 (2010-08-16 patchlevel 302) [i686-linux] If you put the RVM source line in your bashrc (in order to ensure that non-interactive shells have access to RVM), you will need to source .bashrc from your .bash_profile with the following as the last lines in your .bash_profile if [ -f "$HOME/.bashrc" ]; then source $HOME/.bashrc fi This pre-supposes that you have [[ -s "$HOME/.rvm/scripts/rvm" ]] &&

Performing writes/reads on class variables in Ruby is not thread safe. Performing writes/reads on instance variables appears to be thread safe. That said, is it thread safe to perform write/reads on instance variables of a class or metaclass object? What are the differences between these three (contrived) examples in terms of thread safety? EXAMPLE 1: MUTUAL EXCLUSION class BestUser # (singleton class) @@instance_lock = Mutex.new # Memoize instance def self.instance @@instance_lock.synchronize do @@instance ||= best end end end EXAMPLE 2: INSTANCE VARIABLE STORAGE class BestUser # (singleton

I have a class: class TestClass def method1 end def method2 end def method3 end end How can I get a list of my methods in this class ( method1 , method2 , method3 )? You actually want TestClass.instance_methods , unless you're interested in what TestClass itself can do. class TestClass def method1 end def method2 end def method3 end end TestClass.methods.grep(/method1/) # => [] TestClass.instance_methods.grep(/method1/) # => ["method1"] TestClass.methods.grep(/new/) # => ["new"] Or you can call methods (not instance_methods ) on the object: test_object = TestClass.new test_object.methods.grep(

When I include a gem that I made, thanks to Bundler (version 1.0.12), in a Gemfile and then I try to bundle or to rake just like that: $ rake I've got this error message: Invalid gemspec in [/Users/zagzag/.rvm/gems/ruby-1.9.2-p180@foobar/specifications/myplugin-1.0.0.gemspec]: invalid date format in specification: "2011-04-21 00:00:00.000000000Z" I'm on the last Mac OS X (10.6.4), with: $ ruby -v ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.4.0] and: $ gem -v Invalid gemspec in [/Users/zagzag/.rvm/gems/ruby-1.9.2-p180@foobar/specifications/myplugin-1.0.0.gemspec]: invalid date