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Add irb to Gemfile.
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Ever since upgrading to Ruby 2.6 (see
#3873), I've
experienced the following crash
when running `bin/rails console`:

```
$ bin/rails c
warning package.json: No license field
warning No license field
Running via Spring preloader in process 12917
Traceback (most recent call last):
	28: from -e:1:in `<main>'
	27: from /usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	26: from /usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	25: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:285:in `load'
	24: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
	23: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:285:in `block in load'
	22: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:285:in `load'
	21: from /home/jeremy/gitting/worldcubeassociation.org/WcaOnRails/bin/rails:11:in `<top (required)>'
	20: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
	19: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
	18: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require'
	17: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
	16: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/commands.rb:18:in `<top (required)>'
	15: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/command.rb:44:in `invoke'
	14: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/command.rb:70:in `find_by_namespace'
	13: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/command/behavior.rb:79:in `lookup'
	12: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/command/behavior.rb:79:in `each'
	11: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/command/behavior.rb:80:in `block in lookup'
	10: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/command/behavior.rb:80:in `each'
	 9: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/command/behavior.rb:84:in `block (2 levels) in lookup'
	 8: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
	 7: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
	 6: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require'
	 5: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
	 4: from /home/jeremy/.gem/ruby/2.6.0/gems/railties-5.2.3/lib/rails/commands/console/console_command.rb:3:in `<top (required)>'
	 3: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
	 2: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
	 1: from /home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require'
/home/jeremy/.gem/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require': cannot load such file -- irb (LoadError)
```

At first I thought this was a quirk of my local environment, but some
Googling let me on the following journey:
  - https://www.reddit.com/r/rails/comments/akhmae/ruby_26_breaks_rails_console/ ->
  - Shopify/bootsnap#223 ->
  - rubygems/bundler#6929 (comment)

So, this appears to be due to a bundler change, and one workaround is to
explicitly add `irb` to your Gemfile. It seems like this may be fixed in
a future version of bundler: rubygems/bundler#6963.
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@jfly
jfly committed Jul 28, 2019
1 parent 16694c2 commit cbdc943
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Showing 2 changed files with 8 additions and 1 deletion.
5 changes: 5 additions & 0 deletions WcaOnRails/Gemfile
View file
Expand Up @@ -101,6 +101,11 @@ group :development, :test do
gem 'byebug'
gem 'i18n-tasks'
gem 'i18n-spec'

# We may be able to remove this when a future version of bundler comes out.
# See https://github.com/bundler/bundler/issues/6929#issuecomment-459151506 and
# https://github.com/bundler/bundler/pull/6963 for more information.
gem 'irb', require: false
end

group :development do
Expand Down
4 changes: 3 additions & 1 deletion WcaOnRails/Gemfile.lock
View file
Expand Up @@ -272,6 +272,7 @@ GEM
image_processing (1.9.2)
mini_magick (>= 4.9.5, < 5)
ruby-vips (>= 2.0.13, < 3)
irb (1.0.0)
iso (0.2.2)
i18n
jaro_winkler (1.5.3)
Expand Down Expand Up @@ -647,6 +648,7 @@ DEPENDENCIES
i18n-spec
i18n-tasks
image_processing
irb
jbuilder
jquery-rails
jquery-slick-rails
Expand Down Expand Up @@ -705,4 +707,4 @@ DEPENDENCIES
wicked_pdf

BUNDLED WITH
2.0.1
2.0.2

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