Different versions of gems

ruby-talk
1

Hello,

I have a may be dummy question:
Is it possible to switch between versions of an installed gem without need to uninstall the newer versions.

Regards,

Ivan Cenov

2

Is it possible to switch between versions of an installed gem without need to uninstall the newer versions.

Yes.

For regular ol’ library gems, just specify different versions in your Gemfile, run `bundle` to set up the `Gemfile.lock`, and use `bundle exec` with your command-line tools to set up the environment right.

If you want to use a specific gem’s version of a command-line tool, i.e. you want to run `sass` with `3.4.18`, you can add the version as a first argument to the command line, surrounded by underscores:

> sass --version

Sass 3.4.21 (Selective Steve)

> sass _3.4.18_ --version

Sass 3.4.18 (Selective Steve)

My question: where is that underscore behavior documented? I first learned about it from a tweet, which isn’t useful for anyone else.

···

On 8 Feb 2016, at 10:47, Ivan Cenov wrote:

3

Yes, In case you want the bleeding edge of the version you can even directly pull from that using git:”path-to-repository” option. Otherwise, you can specify the version number as “~>x.x.x” and run bundle install. It would overwrite the gem. Also, I recommend using RVM or RBenv.

···

On 08-Feb-2016, at 9:17 PM, Ivan Cenov <i_cenov@botevgrad.com> wrote:

Hello,

I have a may be dummy question:
Is it possible to switch between versions of an installed gem without need to uninstall the newer versions.

Regards,

Ivan Cenov

Unsubscribe: <mailto:ruby-talk-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-talk&gt;

4

@Ivan,

if you need a specific library version in a simple script and do not
want to use a Gemfile and bundler, you can use the Kernel#gem method
directly in your script:

  gem "mygem", "= 3.1.4"

Regards,
Marcus

···

Am 08.02.2016 um 17:04 schrieb Bryce Kerley:

On 8 Feb 2016, at 10:47, Ivan Cenov wrote:

    Is it possible to switch between versions of an installed gem
    without need to uninstall the newer versions.

Yes.

For regular ol’ library gems, just specify different versions in your
Gemfile, run |bundle| to set up the |Gemfile.lock|, and use |bundle
exec> with your command-line tools to set up the environment right.

--
GitHub: stomar (Marcus Stollsteimer) · GitHub
PGP: 0x6B3A101A

5

На 13.2.2016 г. в 12:15 ч., sto.mar@web.de написа:

@Ivan,

if you need a specific library version in a simple script and do not
want to use a Gemfile and bundler, you can use the Kernel#gem method
directly in your script:

   gem "mygem", "= 3.1.4"

Regards,
Marcus

Hi,

In my case, I use an old version of a gem (ceedling). However I modified it for my needs.
I have rakefile.rb in the folder where I start this gem. The content of this rakefile.rb is

require 'ceedling'

I want to upgrade to the new version of the gem 'ceedling' and modify it for my needs
and I also want to keep the old version meanwhile.

I start the gem by

ruby.exe "path_to_ruby\bin\rake" test:all

···

--

Regards,
and let's make better business with http://www.redmine.org

Ivan Cenov
OKTO-7 Ltd. Bulgaria
imc@okto7.com, i_cenov@botevgrad.com
mobile:+359888761080,
phone:+35972366161, fax:+35972366262