Class methods apply to collection - Ruby

collection_methods.rb

class MyModel < ActiveRecord::Base
  scope :custom_scope, -> { where.not(id: [1, 2, 3]) } # id not in (1, 2, 3) <=> id != 1 and id != 2 and id != 3
  
  def self.class_method
    all.each { |x| puts x }
  end
  
  def to_s
    'Hey'
  end
end

MyModel.custom_scope.class_method