A Fresh Cup is Mike Gunderloy's software development weblog, covering Ruby on Rails and whatever else I find interesting in the universe of software. I'm a full-time software developer: most of my time in recent years has been spent writing Rails, though I've dabbled in many other things and like most people who have been writing code for decades I can learn new stuff as needed.

As of October 2016, I'm not actively looking for my next job, but I'm still happy to chat about potential opportunities. I'm not able to relocate, so unless you're in the Evansville area, I'd need a completely remote gig. I have lots of experience working remote. Prefer full-time but I wouldn't be averse to an interesting contact gig. Drop me a comment if you've got something or email MikeG1 [at] larkfarm.com.

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Saturday
Oct252008

Rails 2.1.2 and 2.2RC1: Update Your RubyGems

There's a mismatch between the most recent Rails releases (2.1.2 and 2.2RC1) and older versions of RubyGems. Judging by what I've seen in various discussion fora, this is well on the way to being a FAQ. It's made more fun by the facts that
  • The error message doesn't implicate RubyGems

  • You may think you're up-to-date on RubyGems when you're not

  • If you're affected, you'll see this message when you try to run script/generate in a Rails application:

    [sourcecode language='ruby']
    undefined method empty?' for /_generator$/:Regexp
    [/sourcecode]

    If you see this, don't panic. It just means you need a newer RubyGems release. I'm not sure how current you need to be, but 1.1.1 is definitely too old. As I write this, 1.3.0 is current.

    Now, in theory, to update to the latest version of RubyGems, you just need to run

    [sourcecode language='ruby']
    sudo gem update --system
    [/sourcecode]

    But - depending on what version of RubyGems you have installed, running that command may lie and tell you that you have nothing to update. If you're currently on RubyGems 1.1 or 1.2, you need to run a different set of commands to update RubyGems:

    [sourcecode language='ruby']
    sudo gem install rubygems-update
    sudo update_rubygems
    [/sourcecode]

    You can check your current RubyGems version with

    [sourcecode language='ruby']
    gem -v
    [/sourcecode]
    If it reports 1.3.0 or later, you should be good to use the recent Rails releases.

    Reader Comments (10)

    Bless you, this post saved my bacon.

    November 4, 2008 | Unregistered CommenterChris Luebcke

    Works like a charm, thank you.

    November 6, 2008 | Unregistered CommenterMario Zigliotto

    Thanks for your hint!

    November 9, 2008 | Unregistered CommenterAdrian

    bah! all hassle in each upgrade...

    November 14, 2008 | Unregistered Commenterdeman

    This is the clearest explanation of how to handle this error on the net. Thanks for taking the time to do it!

    November 15, 2008 | Unregistered Commenterjeman

    Thanks for the tip, much appreciated!

    November 17, 2008 | Unregistered CommenterIphan

    Thank You, Mike! Helped me out (I had RubyGems 1.2).

    November 28, 2008 | Unregistered CommenterHarry

    Thank you! I couldn't find this info. on the RubyGems site!

    December 8, 2008 | Unregistered CommenterDavid Rivers

    I am current using Ubuntu 8.10. For me, if I ran the commands, rubygems would stay at 1.2 even though it looked like it "updated successfully"

    If you are trying to update ruby gems on Ubuntu, you may need to install it manually. Sam Ruby has a good set of instructions. See http://intertwingly.net/blog/2008/11/23/RubyGems-1-3-1-on-Ubuntu-8-10

    December 31, 2008 | Unregistered CommenterBen Wagaman

    Hi, I thought i was getting close to success upon finding this thread.
    After your alternative update commands, my terminal reports that i now have v1.3.3 but xcode debugger still tells me i have 1.0.1.

    Due to installation issues with ruby/rails et al, on two different mac's I haven't been able to get past step one of a single tutorial.

    Please can someone point me in the right direction!?!

    Kindest regards

    Jez

    May 27, 2009 | Unregistered Commenterjez

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