refactoring with query object

after.rb

class PopularSalariesQuery
  def all
    # return data in whatever shape is needed
  end
end

# Somewhere in the controller
@data = PopularSalariesQuery.new.all

before.rb

class SalaryGroup < ApplicationRecord
  # some simple code
end

before_after_some_time.rb

class SalaryGroup < ApplicationRecord
  # some simple code

  def self.popular_salaries
    # return data in whatever shape is needed
  end
end

# Somewhere in the controller
@data = SalaryGroup.popular_salaries

https://adriangohjw.github.io/posts/2021/06/05/i-hate-fat-models-part-1-query-object.html