An error occurred when inspecting the object: #<NoMethodError: undefined method 'end_with?' for nil>

[vladimirtcats]

Hi everyone

When I run any command in console I get error

User.last.attributes
An error occurred when inspecting the object: #<NoMethodError: undefined method 'end_with?' for nil>
Result of Kernel#inspect: #<Hash:0x00007f05a39d7268>
=> {#<Hash:0x00007f05a39d7268>

irb_info

irb_info
Ruby version: 3.4.1
IRB version: irb 1.15.1 (2025-01-22)
InputMethod: RelineInputMethod with Reline 0.6.0 and /root/.inputrc
Completion: Tab Complete, RegexpCompletor
RUBY_PLATFORM: x86_64-linux
LANG env: C.UTF-8
LC_ALL env: C.UTF-8
East Asian Ambiguous Width: 1

[tompng]

What is the output of p STDIN.winsize, STDOUT.winsize when the error occurs?

[vladimirtcats]

What is the output of p STDIN.winsize, STDOUT.winsize when the error occurs?

p STDIN.winsize
[0, 0]
An error occurred when inspecting the object: #<NoMethodError: undefined method 'end_with?' for nil>
Result of Kernel#inspect: #<Array:0x00007f05a3ce1e90>
=> [#<Array:0x00007f05a3ce1e90>

STDOUT.winsize
An error occurred when inspecting the object: #<NoMethodError: undefined method 'end_with?' for nil>
Result of Kernel#inspect: #<Array:0x00007f05a3f47d38>
=> [#<Array:0x00007f05a3f47d38>

I use irb with rails 8

[tompng]

Thank you. I think #1073 will fix it.
For reference, do you have any idea why winsize is [0, 0]? Terminal environment, running rails console through some command line tool etc.

[vladimirtcats]

I run console in standart maOS terminal in fullscreen

[tompng]

I can't reproduce it with the latest Rails console.
What is the output of stty size before and after rails console?

$ stty size
????

$ rails console
> p STDIN.winsize
[0, 0] # This should be zero for this investigation
An error occurred ...
[#<Array ...
> exit

$ stty size
????

If stty size is already zero, something is already going wrong. In this case, many CUI programs (ex: less, emacs, vim) does not work properly. It is better for IRB not to raise an error though.
If STDIN.winsize is changed to zero in rails console, I think there is a library listed in your Gemfile.lock that has a bug handling winsize. Reporting it to that library will be helpful.
In any case, resizing terminal window will restore wrong winsize to the correct value.

[vladimirtcats]

stty size
0 0

bundle exec rails c

p STDIN.winsize
[0, 0]
An error occurred when inspecting the object: #<NoMethodError: undefined method 'end_with?' for nil>
Result of Kernel#inspect: #<Array:0x00007f2a7b5e2d68>
=> [#<Array:0x00007f2a7b5e2d68>

stty size
0 0

Gemfile:

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '3.4.1'

gem 'rails', '~> 8.0', '>= 8.0.1'
gem 'puma', '~> 6.5'
gem 'jbuilder', '~> 2.13'

gem 'pg', '~> 1.5', '>= 1.5.9'
gem 'oj', '3.16'

gem 'rack-cors', require: 'rack/cors'
gem 'elastic-apm', '~> 4.7'
gem 'lograge'

gem 'daemons'
gem 'sentry-raven'
gem 'concurrent-ruby'

gem 'bullet', '~> 8.0'

# remove warnings
gem 'mutex_m'
gem 'drb'
gem 'logger'
gem 'ostruct'
gem 'benchmark'
gem 'reline'
gem 'irb'

group :development, :test do
  gem 'bundler-audit', '~> 0.9.2'
  gem 'brakeman', require: false
  gem 'pry-byebug'
  gem 'rspec-rails', '~> 7.0.0'
  gem 'rails-controller-testing'
  gem 'simplecov', require: false
  gem 'factory_bot_rails', '~> 6.4'
end

group :test do
  gem 'webmock', '~> 3.24'
  gem 'rspec_junit_formatter'
  gem 'timecop'
  gem 'database_cleaner-active_record'
  gem 'rspec_api_documentation'
  gem 'n_plus_one_control', '~> 0.7.2'
end

It is strange, it works good in my local envronment

stty size
46 156

but it does not work in container because

stty size
0 0

[vladimirtcats]

Your patch helped, thank you!

[tompng]

I think something is wrong with your container launching/connecting command or its command alias.

Here is a zero winsize reproduction example. Running docker with -t option (allocating a pseudo-TTY) but STDOUT is connected to a pipe to cat, so the correct winsize is unavailable.

$ docker run --rm -it rubylang/rubyfarm | cat
root@79ddcce38253:/# stty size
0 0
root@79ddcce38253:/# ruby -e "puts(*1..100)" | less
Gets corrupt screen while scrolling up and down (if the actual winsize is not 80x24)

[vladimirtcats]

@tompng Unfortunately, I can not influence parameters of container. Could you merge your patch in master?

[klausmeyer]

Also running into this issue - maybe one interesting observation:

I'm only getting the error when I access the container shell via Kubernetes Dashboard (Web UI) and not when using kubectl or other CLI based tools like k9s.

Here is the output of the stty command each:

Kubernetes Dashboard:

~ $ stty size
stty: standard input

CLI:

~ $ stty size
80 174

[Napolskih]

@tompng

I also encountered this problem in containers running in Kubernetes, when accessing via a web terminal.

There is no problem locally, even in containers (not in Kubernetes).

It was noticed that the problem is related to updating gems:
async-http
traces
console

It seems that the problem appears if you update the console gem above 1.29.2.

/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/pager.rb:192:in `write'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/prettyprint-0.2.0/lib/prettyprint.rb:184:in `text'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/color_printer.rb:50:in `text'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/pp-0.6.2/lib/pp.rb:206:in `rescue in block in pp'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/pp-0.6.2/lib/pp.rb:204:in `block in pp'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/prettyprint-0.2.0/lib/prettyprint.rb:255:in `block (2 levels) in group'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/prettyprint-0.2.0/lib/prettyprint.rb:282:in `nest'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/prettyprint-0.2.0/lib/prettyprint.rb:254:in `block in group'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/prettyprint-0.2.0/lib/prettyprint.rb:267:in `group_sub'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/prettyprint-0.2.0/lib/prettyprint.rb:253:in `group'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/pp-0.6.2/lib/pp.rb:203:in `pp'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/color_printer.rb:35:in `pp'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/color_printer.rb:10:in `block in pp'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/pp-0.6.2/lib/pp.rb:160:in `guard_inspect_key'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/color_printer.rb:10:in `pp'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/inspector.rb:122:in `block in <module:IRB>'
(app):3:in `inspect_value'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/context.rb:662:in `inspect_last_value'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:542:in `block in output_value'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb/pager.rb:66:in `page_with_preview'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:541:in `output_value'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:209:in `block (2 levels) in eval_input'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:512:in `signal_status'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:193:in `block in eval_input'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:272:in `block in each_top_level_statement'
<internal:kernel>:187:in `loop'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:269:in `each_top_level_statement'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:192:in `eval_input'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:173:in `block in run'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:172:in `catch'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/irb-1.15.1/lib/irb.rb:172:in `run'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/commands/console/irb_console.rb:129:in `start'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/commands/console/console_command.rb:59:in `start'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/commands/console/console_command.rb:8:in `start'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/commands/console/console_command.rb:87:in `perform'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/thor-1.3.2/lib/thor/command.rb:28:in `run'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/thor-1.3.2/lib/thor/invocation.rb:127:in `invoke_command'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/command/base.rb:178:in `invoke_command'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/thor-1.3.2/lib/thor.rb:538:in `dispatch'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/command/base.rb:73:in `perform'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/command.rb:71:in `block in invoke'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/command.rb:149:in `with_argv'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/command.rb:69:in `invoke'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/railties-7.2.2.1/lib/rails/commands.rb:18:in `<main>'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `require'
/usr/local/lib/ruby/3.3.0/bundled_gems.rb:69:in `block (2 levels) in replace_require'
/usr/src/app/vendor/cache/ruby/3.3.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
bin/rails:6:in `<main>'

Please release fixed version.

[tompng]

https://github.com/ruby/irb/releases/tag/v1.15.2 Released