tl;dr;
どっちのケースの場合もrubocop-rspec v2.0.0.preで直ってるので Gemfile に下記のように書けば直る
group :development do gem "rubocop-rspec", ">= 2.0.0.pre", require: false end
ケース1: rubocop-rspec内でエラーになる
エラー内容
-d （デバッグ出力）を有効にしないとエラー内容が表示されないので注意
$ bundle exec rubocop -d （中略） An error occurred while RSpec/FactoryBot/CreateList cop was inspecting /Users/sue445/workspace/github.com/sue445/app-stat-api/spec/app_spec.rb:1:0. undefined method `to_sym' for nil:NilClass /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/mixin/configurable_enforced_style.rb:69:in `style' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-rspec-1.42.0/lib/rubocop/cop/rspec/factory_bot/create_list.rb:51:in `on_block' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:100:in `public_send' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:100:in `block (2 levels) in trigger_responding_cops' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:166:in `with_cop_error_handling' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:99:in `block in trigger_responding_cops' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:98:in `each' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:98:in `trigger_responding_cops' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:69:in `on_block' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-ast-1.1.0/lib/rubocop/ast/traversal.rb:20:in `walk' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/commissioner.rb:86:in `investigate' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/team.rb:157:in `investigate_partial' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cop/team.rb:83:in `investigate' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:315:in `inspect_file' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:259:in `block in do_inspection_loop' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:293:in `block in iterate_until_no_changes' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:286:in `loop' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:286:in `iterate_until_no_changes' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:255:in `do_inspection_loop' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:132:in `block in file_offenses' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:157:in `file_offense_cache' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:131:in `file_offenses' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:122:in `process_file' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:101:in `block in each_inspected_file' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:100:in `each' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:100:in `reduce' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:100:in `each_inspected_file' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:86:in `inspect_files' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/runner.rb:47:in `run' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cli/command/execute_runner.rb:17:in `run' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cli/command.rb:11:in `run' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cli/environment.rb:18:in `run' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cli.rb:65:in `run_command' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cli.rb:72:in `execute_runners' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/lib/rubocop/cli.rb:41:in `run' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/exe/rubocop:13:in `block in <top (required)>' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/benchmark.rb:308:in `realtime' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/gems/rubocop-1.1.0/exe/rubocop:12:in `<top (required)>' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/bin/rubocop:23:in `load' /Users/sue445/workspace/github.com/sue445/app-stat-api/vendor/bundle/ruby/2.7.0/bin/rubocop:23:in `<top (required)>' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `load' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `kernel_load' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/cli/exec.rb:28:in `run' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/cli.rb:476:in `exec' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor.rb:399:in `dispatch' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/cli.rb:30:in `dispatch' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/base.rb:476:in `start' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/cli.rb:24:in `start' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:46:in `block in <top (required)>' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/2.7.0/bundler/friendly_errors.rb:123:in `with_friendly_errors' /Users/sue445/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:34:in `<top (required)>' /Users/sue445/.rbenv/versions/2.7.2/bin/bundle:23:in `load' /Users/sue445/.rbenv/versions/2.7.2/bin/bundle:23:in `<main>'
関連するissue
実際に対応したコミット
https://github.com/sue445/app-stat-api/pull/631/commits/7013ba612d2f1f663e2b8e60816655de6770602e
ケース2: 意図せずrubocop-rspecのバージョンが下がる
注意点
https://github.com/rubocop-hq/rubocop-rspec/blob/v2.0.0.pre/CHANGELOG.md#200pre-2020-10-22
v2で 下記のようなbreaking changeがあるので注意
(Potentially breaking) Change namespace of several cops (
Capybara/*->RSpec/Capybara/*,FactoryBot/*->RSpec/FactoryBot/*,Rails/*->RSpec/Rails/*).
