Fix error in Rails/Presence when ternary operators are used in multiple lines

[r7kamura]

When I run rubocop-rails against the following code, I get an error from Rails/Presence cop.

a.present? ?
  a :
  b

After investigation, I have identified the problem and would like to fix it.

---

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• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.
• If this is a new cop, consider making a corresponding update to the Rails Style Guide.

[r7kamura]

The actual error I encountered was as follows:

$ bundle exec rubocop --debug example.rb
For /app: configuration from /app/.rubocop.yml
configuration from /bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/config/default.yml
configuration from /bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/config/default.yml
Default configuration from /bundle/ruby/2.7.0/gems/rubocop-1.37.1/config/default.yml
Inheriting configuration from /app/.rubocop_todo.yml
Use parallel by default.
Skipping parallel inspection: only a single file needs inspection
Inspecting 1 file
Scanning /app/example.rb
An error occurred while Rails/Presence cop was inspecting /app/example.rb:3:0.
undefined method `keyword' for #<Parser::Source::Map::Ternary:0x000055aaee81c4c0>
/bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/lib/rubocop/cop/rails/presence.rb:116:in `current'
/bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/lib/rubocop/cop/rails/presence.rb:110:in `message'
/bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/lib/rubocop/cop/rails/presence.rb:95:in `register_offense'
/bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/lib/rubocop/cop/rails/presence.rb:82:in `block in on_if'
/bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/lib/rubocop/cop/rails/presence.rb:64:in `redundant_receiver_and_other'
/bundle/ruby/2.7.0/gems/rubocop-rails-2.17.4/lib/rubocop/cop/rails/presence.rb:79:in `on_if'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:100:in `public_send'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:100:in `block (2 levels) in trigger_responding_cops'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:160:in `with_cop_error_handling'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:99:in `block in trigger_responding_cops'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:98:in `each'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:98:in `trigger_responding_cops'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:69:in `on_if'
/bundle/ruby/2.7.0/gems/rubocop-ast-1.23.0/lib/rubocop/ast/traversal.rb:20:in `walk'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/commissioner.rb:86:in `investigate'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/team.rb:155:in `investigate_partial'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cop/team.rb:83:in `investigate'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:315:in `inspect_file'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:259:in `block in do_inspection_loop'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:293:in `block in iterate_until_no_changes'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:286:in `loop'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:286:in `iterate_until_no_changes'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:255:in `do_inspection_loop'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:138:in `block in file_offenses'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:163:in `file_offense_cache'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:137:in `file_offenses'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:128:in `process_file'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:109:in `block in each_inspected_file'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:108:in `each'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:108:in `reduce'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:108:in `each_inspected_file'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:94:in `inspect_files'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/runner.rb:47:in `run'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli/command.rb:11:in `run'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli/environment.rb:18:in `run'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli.rb:72:in `run_command'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli.rb:79:in `execute_runners'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/lib/rubocop/cli.rb:48:in `run'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/exe/rubocop:19:in `block in <top (required)>'
/usr/local/lib/ruby/2.7.0/benchmark.rb:308:in `realtime'
/bundle/ruby/2.7.0/gems/rubocop-1.37.1/exe/rubocop:19:in `<top (required)>'
/bundle/ruby/2.7.0/bin/rubocop:23:in `load'
/bundle/ruby/2.7.0/bin/rubocop:23:in `<top (required)>'
/bundle/gems/bundler-2.2.32/lib/bundler/cli/exec.rb:58:in `load'
/bundle/gems/bundler-2.2.32/lib/bundler/cli/exec.rb:58:in `kernel_load'
/bundle/gems/bundler-2.2.32/lib/bundler/cli/exec.rb:23:in `run'
/bundle/gems/bundler-2.2.32/lib/bundler/cli.rb:478:in `exec'
/bundle/gems/bundler-2.2.32/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/bundle/gems/bundler-2.2.32/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/bundle/gems/bundler-2.2.32/lib/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
/bundle/gems/bundler-2.2.32/lib/bundler/cli.rb:31:in `dispatch'
/bundle/gems/bundler-2.2.32/lib/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
/bundle/gems/bundler-2.2.32/lib/bundler/cli.rb:25:in `start'
/bundle/gems/bundler-2.2.32/exe/bundle:49:in `block in <top (required)>'
/bundle/gems/bundler-2.2.32/lib/bundler/friendly_errors.rb:103:in `with_friendly_errors'
/bundle/gems/bundler-2.2.32/exe/bundle:37:in `<top (required)>'
/bundle/bin/bundle:113:in `load'
/bundle/bin/bundle:113:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Rails/Presence cop was inspecting /app/example.rb:3:0.
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:
1.37.1 (using Parser 3.1.2.1, rubocop-ast 1.23.0, running on ruby 2.7.5) [x86_64-linux]
Finished in 0.37355209999805083 seconds

[koic]

This looks good. Can you squash commits into one?

[r7kamura]

OK, I'll squash them 👌

[koic]

Thanks!