How to use RuboCop::Cop::Rails::ApplicationRecord on Rails 4

[ryosk7]

Hi there.
I want to use ApplicationRecord Cop on Rails 4.
I already added 'self.abstract_class = true' .

class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true
end

And this file is written 'minimum_target_rails_version 5.0'.

https://github.com/rubocop-hq/rubocop-rails/blob/master/lib/rubocop/cop/rails/application_record.rb

So I created custom_cop like this.

# frozen_string_literal: true

module CustomCops
  # @example
  #
  #  # good
  #  class Rails5Model < ApplicationRecord
  #    # ...
  #  end
  #
  #  # bad
  #  class Rails4Model < ActiveRecord::Base
  #    # ...
  #  end
  class MustApplicationRecord < RuboCop::Cop::Cop
    MSG = 'Models should subclass `ApplicationRecord`.'
    SUPERCLASS = 'ApplicationRecord'
    BASE_PATTERN = '(const (const nil? :ActiveRecord) :Base)'
    include RuboCop::Cop::EnforceSuperclass
    

    def autocorrect(node)
      lambda do |corrector|
        corrector.replace(node.source_range, self.class::SUPERCLASS)
      end
    end
  end
end

But I got an error running rspec, like this.

Failure/Error:
         class MustApplicationRecord < RuboCop::Cop::Cop
           MSG = 'Models should subclass `ApplicationRecord`.'
           SUPERCLASS = 'ApplicationRecord'
           BASE_PATTERN = '(const (const nil? :ActiveRecord) :Base)'
           include RuboCop::Cop::EnforceSuperclass


           def autocorrect(node)
             lambda do |corrector|
               corrector.replace(node.source_range, self.class::SUPERCLASS)

NameError:
         uninitialized constant CustomCops::RuboCop

Do you know how to solve this error, or other method( like override 'minimum_target_rails_version 5.0' to 'minimum_target_rails_version 4.0' ) ?

versions

Rails 4.2.8
ruby 2.6.6
rubocop 0.80.1
RSpec 3.9

[koic]

I'm sorry about I will close this issue because RuboCop Rails is currently negative support for Rails 4 series. #236
I think it works by reusing Rails/ApplicationRecord cop's implementation with your custom cop and removing minimum_target_rails_version 5.0 from the reused implementation.

[ryosk7]

Thank you :-)