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It would be nice if NB allowed the user to use the gems already installed on the system, including Rails, rather than having to install another set of gems using the Ruby Gem Manager. In most scenarios, user will need/want access to gems outside of NetBeans, and it therefore means having to maintain/update two sets of gems. This would include Rails. Therefore, NetBeans Ruby module wouldn't have to ship with Rails (though a version could). This could perhaps be a preferences option, allowing the user to specify the path where the gems are installed on the system (ie, /usr/lib/ruby/gems/1.8/gems) depending on the setup.
This should already be working. The Gem Manager will show the gems installed for whatever Ruby interpreter you are using. If you switch to your native Ruby (e.g. /usr/bin/ruby), it should be showing all the gems installed with it. If I misunderstood what you meant, feel free to reopen this issue.
Reassigning this issue to newly created 'ruby' component.
Changing target milestone of all resolved Ruby issues from TBD to 6.0 Beta 1 build.