Error occurred with ActiveRecord::ModelSchema::ClassMethods#ignored_columns=

[obregonia1]

Thank you for always letting me use RuboCop. I am reporting that I encountered an error while working on deleting a column in a Rails app. I would be happy if you could handle this problem.

https://api.rubyonrails.org/classes/ActiveRecord/ModelSchema/ClassMethods.html#method-i-ignored_columns-3D

---

Expected behavior

No errors.

Actual behavior

$ rubocop -d app/models/foo.rb                     
For /rails/site: configuration from /rails/site/.rubocop.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/config/default.yml
Default configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-capybara-2.20.0/config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-capybara-2.20.0/lib/../config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-factory_bot-2.25.1/config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-factory_bot-2.25.1/lib/../config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rspec-2.26.1/config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rspec-2.26.1/config/default.yml
configuration from /rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-graphql-1.5.0/config/default.yml
configuration from #{path}
Inheriting configuration from /rails/site/.rubocop_todo.yml
Use parallel by default.
Skipping parallel inspection: only a single file needs inspection
Inspecting 1 file
Scanning /rails/site/app/models/foo.rb
An error occurred while Rails/UnusedIgnoredColumns cop was inspecting /rails/site/app/models/foo.rb:4:2.
undefined method `type' for nil:NilClass
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/rails/schema_loader/schema.rb:47:in `each_table'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/rails/schema_loader/schema.rb:34:in `build!'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/rails/schema_loader/schema.rb:14:in `initialize'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/rails/schema_loader.rb:46:in `new'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/rails/schema_loader.rb:46:in `load!'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/rails/schema_loader.rb:18:in `load'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/cop/mixin/active_record_helper.rb:42:in `schema'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-rails-2.23.1/lib/rubocop/cop/rails/unused_ignored_columns.rb:41:in `on_send'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:107:in `public_send'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:107:in `block (2 levels) in trigger_responding_cops'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:171:in `with_cop_error_handling'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:106:in `block in trigger_responding_cops'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:105:in `each'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:105:in `trigger_responding_cops'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:69:in `on_op_asgn'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-ast-1.30.0/lib/rubocop/ast/traversal.rb:154:in `on_class'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:71:in `on_class'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-ast-1.30.0/lib/rubocop/ast/traversal.rb:20:in `walk'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/commissioner.rb:87:in `investigate'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/team.rb:156:in `investigate_partial'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cop/team.rb:98:in `investigate'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:345:in `block in inspect_file'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:344:in `each'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:344:in `flat_map'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:344:in `inspect_file'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:287:in `block in do_inspection_loop'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:321:in `block in iterate_until_no_changes'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:314:in `loop'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:314:in `iterate_until_no_changes'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:283:in `do_inspection_loop'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:164:in `block in file_offenses'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:189:in `file_offense_cache'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:163:in `file_offenses'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:154:in `process_file'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:135:in `block in each_inspected_file'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:134:in `each'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:134:in `reduce'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:134:in `each_inspected_file'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:120:in `inspect_files'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/runner.rb:73:in `run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli/command.rb:11:in `run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli/environment.rb:18:in `run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli.rb:118:in `run_command'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli.rb:125:in `execute_runners'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli.rb:51:in `block in run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli.rb:77:in `profile_if_needed'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/lib/rubocop/cli.rb:43:in `run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/exe/rubocop:19:in `block in <top (required)>'
/usr/local/lib/ruby/3.2.0/benchmark.rb:311:in `realtime'
/rails/site/vendor/bundle/ruby/3.2.0/gems/rubocop-1.60.2/exe/rubocop:19:in `<top (required)>'
/rails/site/vendor/bundle/ruby/3.2.0/bin/rubocop:25:in `load'
/rails/site/vendor/bundle/ruby/3.2.0/bin/rubocop:25:in `<top (required)>'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/cli/exec.rb:58:in `load'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/cli/exec.rb:58:in `kernel_load'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/cli/exec.rb:23:in `run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/cli.rb:486:in `exec'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/cli.rb:31:in `dispatch'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/cli.rb:25:in `start'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/exe/bundle:48:in `block in <top (required)>'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/lib/bundler/friendly_errors.rb:120:in `with_friendly_errors'
/rails/site/vendor/bundle/ruby/3.2.0/gems/bundler-2.3.26/exe/bundle:36:in `<top (required)>'
/usr/local/bundle/bin/bundle:25:in `load'
/usr/local/bundle/bin/bundle:25:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Rails/UnusedIgnoredColumns cop was inspecting /rails/site/app/models/foo.rb:4:2.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop/rubocop/issues

Mention the following information in the issue report:
1.60.2 (using Parser 3.3.0.5, rubocop-ast 1.30.0, running on ruby 3.2.2) [aarch64-linux-musl]
Finished in 0.42401237500598654 seconds

Steps to reproduce the problem

foo.rb

# frozen_string_literal: true

class Foo < ApplicationRecord
  self.ignored_columns += [:bar]
end

And then, execute rubocop.

RuboCop version

$ [bundle exec] rubocop -V
1.60.2 (using Parser 3.3.0.5, rubocop-ast 1.30.0, running on ruby 3.2.2) [aarch64-linux-musl]
  - rubocop-factory_bot 2.25.1
  - rubocop-graphql 1.5.0
  - rubocop-rails 2.23.1
  - rubocop-rspec 2.26.1