Extending Imported Class

investor.rb

# references:
# - https://guides.rubyonrails.org/v4.0/plugins.html
# - https://stackoverflow.com/questions/22473391/custom-search-with-ransacker?rq=1

require "./app/models/investor"

Investor.class_eval do
# can directly introduce class_eval
  scope :total_investment, -> { 1000+500 }
  
# can include module
  include Extensions::Ransacker
end

module Extensions
  module Ransacker
    def self.included(base)
      base.class_eval do
        ransacker :total_investment_amount, formatter: ->(amount) {
        }
      end
    end
  end
end