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Editorial Team
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Asked: 2026-06-15T23:01:36+00:00

I found the below given statement in boot.rb file inside the root folder of

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I found the below given statement in boot.rb file inside the root folder of my Rails Application.

ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)

Can anyone help me to understand the usage of ENV['BUNDLE_GEMFILE'] and ||= in this context?

Thank you.

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1 Answer

  1. Editorial Team

    ENV is a hash. BUNDLE_GEMFILE is an item in that hash. ||= known as “or equals” operator, what it does is checks if ENV['BUNDLE_GEMFILE'] is set, if it is, then it takes the same. But if it isn’t, then it assigns whatever the function File.expand_path()returns to ENV['BUNDLE_GEMFILE'].

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