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ruby: code to install gem if missing

ruby rubygems

I added the gem in rails, but it still says gem missing?

Background Job Manager for Rails 3

ERROR: While executing gem ... (NoMethodError) undefined method `spec' for nil:NilClass

Strange errors when installing my gem

ruby rubygems gemspecs

Why should I use application-specific RVM gemsets in addition to Bundler?

ruby rubygems rvm bundler

How to use rspec to test screen scraping?

rake release hangs when releasing a gem

chef ruby gem installer failing

Error when install pods

ios rubygems cocoapods

Rails active admin undefined methods

Unable to download data from rubygems

ssl rubygems

Add `gem 'pg'` to your Gemfile and ensure its version is at the minimum required by ActiveRecord

How do i fix in ruby on rails the undefined method `alias_method_chain' error?

Why does Kernel#require raise a LoadError in Ruby?

ruby rubygems require

How to install Nokogiri on Ruby 2.7.0

ruby rubygems nokogiri

I can't get the ruby development kit working for Windows XP

How to tackle different user types with Devise

Can't install bundler 1.3.0 with ruby 2.0

ruby rubygems bundler ruby-2.0

ERROR: While executing gem ... (TypeError) incompatible marshal file format (can't be read)