How to Require a Specific Version of a Ruby Gem

How do I require a specific version of a ruby gem?

My problem was twofold:

1) confusing gem command syntax with that used in config.gem lines in a rails environment.rb configuration file.

2) failing to issue a require command after the gem command.

Proper usage in a script is:

gem 'ruby-oci8', '=1.0.7'
require 'oci8'           # example is confusing; file required (oci8.rb) is not 
                         # same name as gem, as is frequently the case

Proper usage in a rails 2.3.x environment.rb file is:

config.gem "ruby-oci8", :version=>'1.0.7'

Thanks to the folks at http://www.ruby-forum.com/topic/109100

Ruby: How to install a specific version of a ruby gem?

Use the -v flag:

$ gem install fog -v 1.8

Require a specific version of RubyGems

I don't believe it's possible to select from among multiple rubygems versions in a single Ruby installation. But you can ensure that the required version is being used. Put the following somewhere where it will be run early in your application's startup, such as the top of your Gemfile (which is just a Ruby file), or at the beginning of a script which doesn't use bundler:

required_rubygems_version = '2.6.0'
if Gem.rubygems_version < Gem::Version.create(required_rubygems_version)
  raise "Please upgrade to rubygems #{required_rubygems_version}"
end

How to run a specific version of a ruby gem

I can't reproduce this issue, but I can think of a few reasons why this might happen:

• Bundler artifacts (perhaps in .bundle/) pointing to the old version. Try running in a different directory and see if it still happens
• A bug in RubyGems (try gem update --system)
• During install, it asked if you wanted to replace the brakeman binary and you selected "no"
• If you are using a Ruby version manager, maybe one version is on a different path than another (like a system gem versus one managed by rvm)
• Any number of GEM_PATH, bundler, gem, rvm weirdness that sometimes occurs

In any case, if I were you I'd gem uninstall brakeman, remove all versions, and install fresh. If you are using rvm, start with a fresh gemset or rvm gemset empty the current one.

How to require a specific gem version in rails gemfile?

If you want to make event-brite client work somehow then you can simply bump the version of tzinfo dependency in eventbrite gemspec file.

First clone the following repository

git clone git@github.com:ryanjarvinen/eventbrite-client.rb.git

Then replace the content of eventbrite-client.gemspec file with the following.

Gem::Specification.new do |s|
  s.name = %q{eventbrite-client}
  s.version = "0.1.3"

  s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
  s.authors = ["Ryan Jarvinen"]
  s.date = %q{2011-08-28}
  s.description = %q{A tiny EventBrite API client. (http://developer.eventbrite.com)}
  s.email = %q{ryan.jarvinen@gmail.com}
  s.extra_rdoc_files = [
    "LICENSE",
    "README.md"
  ]
  s.files = [
    ".document",
    "LICENSE",
    "README.md",
    "Rakefile",
    "VERSION",
    "eventbrite-client.gemspec",
    "lib/eventbrite-client.rb",
  ]
  s.homepage = %q{http://github.com/ryanjarvinen/eventbrite-client.rb}
  s.require_paths = ["lib"]
  s.rubygems_version = %q{1.6.2}
  s.summary = %q{A tiny EventBrite API client}

  if s.respond_to? :specification_version then
    s.specification_version = 3

    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
      s.add_development_dependency(%q<rspec>, ["~> 1.3.0"])
      s.add_runtime_dependency(%q<httparty>, ["~> 0.8.0"])
      s.add_runtime_dependency(%q<tzinfo>, ["~> 1.1"])
    else
      s.add_dependency(%q<rspec>, ["~> 1.3.0"])
      s.add_dependency(%q<httparty>, ["~> 0.8.0"])
      s.add_dependency(%q<tzinfo>, ["~> 1.1"])
    end
  else
    s.add_dependency(%q<rspec>, ["~> 1.3.0"])
    s.add_dependency(%q<httparty>, ["~> 0.8.0"])
    s.add_dependency(%q<tzinfo>, ["~> 1.1"])
  end
end

And then you can rebuild the gem with

gem build eventbrite-client.gemspec

Install it using

gem install ./name_of_the_gem.gem

How to publish a lower version of a Ruby gem

Yes, that is possible. Just adjust the required_ruby_version in your .gemspec file before uploading.

For example:

spec.required_ruby_version = '>= 2.5.0'

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