You might get this error if you’re using Rails Edge: config.breakpoint_server has been deprecated and has no effect:

To fix the error we need to remove the following from config/environments/development.rb:

   1  config.breakpoint_server = true

Next install ruby-debug:

   1  gem install ruby-debug

Then add this to the end of config/environments/development.rb:

   1  require 'ruby-debug'

Next, start your server, and the error should be gone…

To debug your code just add a call to debugger:

   1  class MySillySpace ...
   2    def create
   3      debugger # add this line
   4    end

Now when you access the URL with your browser you’ll have access to the debugger from the console window.

To learn how to use ruby-debug, read this tutorial written by the ruby-debug author.

If you’re using Edge Rails and mongrel you might have seen this error:

   1  warning: already initialized constant OPTIONS

There’s a bug report here that explains this problem in detail.

The solution for me was to rerun the freeze command:

   1  rake rails:freeze:edge

You might also get “warning: already initialized constant OPTIONS ” error if you haven’t installed a gem your software relies on. In the following example openssl should be installed:

   1  /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require’: no such file to load—openssl (MissingSourceFile)

ActiveResource might also be the problem:

   1  gem install activeresource --source http://gems.rubyonrails.org