Rake task gives different results when `rails` is loaded

[rickselby]

I noticed a difference when running rubocop and rake rubocop in a rails app. I managed to reproduce this outside of a rails app, when rails is included in Rakefile (which rails apps do, to load the rails rake tasks).

rubocop/rubocop#14430 suggests this is an issue with rubocop-performance.

---

Expected behavior

rubocop and rake rubocop should report the same cops

Actual behavior

rake rubocop reports an additional cop

Steps to reproduce the problem

.rubocop.yml

---
plugins:
  - rubocop-performance

AllCops:
  NewCops: enable

Gemfile

# frozen_string_literal: true

source 'https://rubygems.org'

gem 'rails', '~> 8.0'
gem 'rake', '~> 13.3'
gem 'rubocop', '~> 1.79'
gem 'rubocop-performance', '~> 1.25'

test.rb

# frozen_string_literal: true

def test
  self.class.reflect_on_all_associations.all? do |assoc|
    [
      %i[restrict_with_error restrict_with_exception].exclude?(assoc.options[:dependent]),
      assoc.macro == :has_one && public_send(assoc.name).nil?,
      assoc.macro == :has_many && public_send(assoc.name).empty?
    ].any?
  end
end

When Rakefile contains:

# frozen_string_literal: true

require 'rubocop/rake_task'

RuboCop::RakeTask.new(:rubocop_debug) { |t| t.options = ['-d'] }

the output is

$ bundle exec rake rubocop_debug
Running RuboCop...
For /home/rick/projects/rubocop: configuration from /home/rick/projects/rubocop/.rubocop.yml
Default configuration from /home/rick/.rvm/gems/ruby-3.4.5/gems/rubocop-1.79.2/config/default.yml
Plugin configuration from /home/rick/.rvm/gems/ruby-3.4.5/gems/rubocop-performance-1.25.0/config/default.yml
Use parallel by default.
Running parallel inspection
Inspecting 3 files
Scanning /home/rick/projects/rubocop/Gemfile
Loading cache from /home/rick/.cache/rubocop_cache/4da9c5645bbb636ced4a682072b9b7a752257be4/6d7a3b621ca1730e04accd938619e4bdab66cfb1/31e685053996528d87497ff45743e642f8a93f7f
.Scanning /home/rick/projects/rubocop/Rakefile
Loading cache from /home/rick/.cache/rubocop_cache/4da9c5645bbb636ced4a682072b9b7a752257be4/6d7a3b621ca1730e04accd938619e4bdab66cfb1/cefe1825040f0c39904997d46613f9c8d9dad5e3
.Scanning /home/rick/projects/rubocop/test.rb
Loading cache from /home/rick/.cache/rubocop_cache/4da9c5645bbb636ced4a682072b9b7a752257be4/6d7a3b621ca1730e04accd938619e4bdab66cfb1/cd813e1ce99c3be7ea271a3cf396ebc1ac80bdbf
.

3 files inspected, no offenses detected

However, when Rakefile contains:

# frozen_string_literal: true

require 'rails'
require 'rubocop/rake_task'

RuboCop::RakeTask.new(:rubocop_debug) { |t| t.options = ['-d'] }

then the output is:

$ bundle exec rake rubocop_debug
Running RuboCop...
For /home/rick/projects/rubocop: configuration from /home/rick/projects/rubocop/.rubocop.yml
Default configuration from /home/rick/.rvm/gems/ruby-3.4.5/gems/rubocop-1.79.2/config/default.yml
Plugin configuration from /home/rick/.rvm/gems/ruby-3.4.5/gems/rubocop-performance-1.25.0/config/default.yml
Use parallel by default.
Running parallel inspection
Loading cache from /home/rick/.cache/rubocop_cache/173b39b6746e352ba5de31362843bf39d25405c2/6d7a3b621ca1730e04accd938619e4bdab66cfb1/cd813e1ce99c3be7ea271a3cf396ebc1ac80bdbf
Inspecting 3 files
Scanning /home/rick/projects/rubocop/Gemfile
Loading cache from /home/rick/.cache/rubocop_cache/173b39b6746e352ba5de31362843bf39d25405c2/6d7a3b621ca1730e04accd938619e4bdab66cfb1/31e685053996528d87497ff45743e642f8a93f7f
.Scanning /home/rick/projects/rubocop/Rakefile
Loading cache from /home/rick/.cache/rubocop_cache/173b39b6746e352ba5de31362843bf39d25405c2/6d7a3b621ca1730e04accd938619e4bdab66cfb1/48c38e2ad02ae34b7141c661239aca3c0225ecb0
.Scanning /home/rick/projects/rubocop/test.rb
Loading cache from /home/rick/.cache/rubocop_cache/173b39b6746e352ba5de31362843bf39d25405c2/6d7a3b621ca1730e04accd938619e4bdab66cfb1/cd813e1ce99c3be7ea271a3cf396ebc1ac80bdbf
C

Offenses:

test.rb:6:7: C: Performance/CollectionLiteralInLoop: Avoid immutable Array literals in loops. It is better to extract it into a local variable or a constant.
      %i[restrict_with_error restrict_with_exception].exclude?(assoc.options[:dependent]),
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

3 files inspected, 1 offense detected
RuboCop failed!

RuboCop version

$ bundle exec rubocop -V
1.79.2 (using Parser 3.3.9.0, Prism 1.4.0, rubocop-ast 1.46.0, analyzing as Ruby 3.4, running on ruby 3.4.5) +server [x86_64-linux]
  - rubocop-performance 1.25.0

RuboCop::RakeTask.new(:rubocop_version) { |t| t.options = ['-V'] }

$ bundle exec rake rubocop_version
Running RuboCop...
1.79.2 (using Parser 3.3.9.0, Prism 1.4.0, rubocop-ast 1.46.0, analyzing as Ruby 3.4, running on ruby 3.4.5) [x86_64-linux]
  - rubocop-performance 1.25.0