ruby on rails - install gem in local machine -

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i using pry gem debugging rails application. have specified in gemfile , using it. dont need push gemfile pry gem specified. everytime need revert original gemfile , push remote repo.

i wondering there way can install pry gem in local machine , use in rails app globally dont have specify gem in gemfile.??

i tried 

gem install pry

but when use binding.pry in rails controller, says

undefined method `pry' #<binding:0x0000000619398>

with bundler can create groups according environments. can intall gem development group. put line below in gemfile.

gem 'pry', :group => :development

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