How to switch between different version of gem installed?

Question

I have three version of rack installed on local machine (rack (1.4.1, 1.3.6, 1.3.5)). For some gem (such as Cucumber), it requires a lower version of rack to be activated?

I have tried with bundle but there is no good.

When executed, cucumber will still use the activated rack with version 1.4.1 of the system. Bundlespecifies which gem should be installed but doesn't ensure which gem will be activated.

How could I activate certain version of rack?

megas · Accepted Answer · 2012-03-15T17:53:42.053

12

You can specify a version in gemfile of your project

gem "rack",  "1.3.5"

Pointed by matt:

To use gem specified in Gemfile:

bundle exec cucumber

edited Mar 15 '12 at 17:53

answered Mar 14 '12 at 13:56

megas

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However, when executed, `cucumber` will still use the activated rack with version `1.4.1` of the system. `Bundle`specifies **which gem should be installed** but doesn't ensure **which gem will be activated**. – steveyang Mar 15 '12 at 07:59
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@steven.yang You can use [`bundle exec`](http://gembundler.com/man/bundle-exec.1.html) to execute a command using the gem versions specified in your `Gemfile`. E.g. `bundle exec cucumber`. – matt Mar 15 '12 at 11:43

score 1 · Answer 2 · answered Mar 14 '12 at 13:54

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Use bundler it will manage it for you.

answered Mar 14 '12 at 13:54

iafonov

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How to switch between different version of gem installed?

2 Answers2

Linked