Protect against pretend generates

Amend the Rails configuration tip to protect against pretend generates, i.e. the `-p` flag.
rubocop · Mar 28, 2024 · 6a4d623 · 6a4d623
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diff --git a/changelog/fix_rails_advice.md b/changelog/fix_rails_advice.md
@@ -0,0 +1 @@
+* [#1263](https://github.com/rubocop/rubocop-rails/pull/1263): Fixes Rails configuration advice to protect against pretend generates ([@jherdman][])
diff --git a/docs/modules/ROOT/pages/usage.adoc b/docs/modules/ROOT/pages/usage.adoc
@@ -41,7 +41,7 @@ your config/application.rb to apply RuboCop autocorrection to code generated by
 module YourCoolApp
   class Application < Rails::Application
     config.generators.after_generate do |files|
-      parsable_files = files.filter { |file| file.end_with?('.rb') }
+      parsable_files = files.filter { |file| File.exist?(file) && file.end_with?('.rb') }
       unless parsable_files.empty?
         system("bundle exec rubocop -A --fail-level=E #{parsable_files.shelljoin}", exception: true)
       end