Question

I am not even new to ruby. I have to get an existing application running which is used as an interface to a Java application (which I understand). When I am trying to obtain all the dependencies (on Linux Mint), I am greeted with the following:

$ bundle install
Fetching gem metadata from http://rubygems.org/......
Fetching gem metadata from http://rubygems.org/..
Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
    bundler (~> 1.0.0) ruby

  Current Bundler version:
    bundler (1.1.5)

This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running `gem install bundler`?

I tried ‘gem install bundler’, but this didn’t work. I tried to install bundler 1.0.0, using:

$ sudo gem install bundler -v 1.0.0
Successfully installed bundler-1.0.0
1 gem installed
Installing ri documentation for bundler-1.0.0...
Installing RDoc documentation for bundler-1.0.0...

This seem to have worked, but I cannot ‘switch’ to it.

Answer 1

You can specify what version of a Gem executable to use by specifying the version surrounded by underscores (_) after the command, e.g.

a_gem_executable _1.2.3_ other args

So in order to specifically run version 1.0.0 of bundler, try this:

bundle _1.0.0_ install

When I tried with 1.0.0, bundler threw an exception, so you might want to try with a more up to date version that’s still compatible with the ~> 1.0.0 specifier:

gem install bundler -v 1.0.18
bundle _1.0.18_ install

It does strike me as slightly unusual to have bundler itself specified in the Gemfile, you might be able to just remove that line as the simpler alternative.