Rails, Ruby Nov 22nd, 2014

From irb to Rails console

From Justing Weiss’s article:

What’s the Difference Between irb, bundle exec irb, bundle console, and rails console?

  • irb

It can’t easily load gems that Bundler installs outside of RubyGems’ load path. Eg. bundle install --path=vendor/bundle

  • bundle exec irb

It can easily load Gemfile gems by Bundler.

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$ irb
>> require 'bundler/setup'
=> true
  • bundle exec console

Find and auto-require Gemfile gems.

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$ irb
>> require 'bundler/setup'
=> true
>> Rails.version
NameError: uninitialized constant Rails
        from (irb):2
        from /Users/wendi/.rvm/rubies/ruby-2.0.0-p353/bin/irb:12:in '<main>'
>> Bundler.require
=> [<Bundler::Dependency type=:runtime name="rails" requirements="= 4.1.6">, ... ]
>> Rails.version
=> "4.1.6"
  • rails console

Find, auto-require Gemfile gems and load Rails Application env.

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$ irb
>> require 'bundler/setup'
=> true
>> Rails.version
NameError: uninitialized constant Rails
        from (irb):2
        from /Users/wendi/.rvm/rubies/ruby-2.0.0-p353/bin/irb:12:in '<main>'
>> Bundler.require
=> [<Bundler::Dependency type=:runtime name="rails" requirements="= 4.1.6">, ... ]
>> Rails.version
=> "4.1.6"
>> require_relative 'config/environment.rb'
=> true